diff --git a/erpnext/accounts/custom/address.py b/erpnext/accounts/custom/address.py
index 5ea8b1d1ca8..d00bd01085e 100644
--- a/erpnext/accounts/custom/address.py
+++ b/erpnext/accounts/custom/address.py
@@ -52,7 +52,7 @@ class ERPNextAddress(Address):
 
 
 @frappe.whitelist()
-def get_shipping_address(company, address=None):
+def get_shipping_address(company: str, address: str | None = None):
 	filters = [
 		["Dynamic Link", "link_doctype", "=", "Company"],
 		["Dynamic Link", "link_name", "=", company],
diff --git a/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py b/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py
index 01e6c48397c..261e68ca015 100644
--- a/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py
+++ b/erpnext/accounts/dashboard_chart_source/account_balance_timeline/account_balance_timeline.py
@@ -13,15 +13,15 @@ from frappe.utils.nestedset import get_descendants_of
 @frappe.whitelist()
 @cache_source
 def get(
-	chart_name=None,
-	chart=None,
-	no_cache=None,
-	filters=None,
-	from_date=None,
-	to_date=None,
-	timespan=None,
-	time_interval=None,
-	heatmap_year=None,
+	chart_name: str | None = None,
+	chart: str | dict | None = None,
+	no_cache: bool | None = None,
+	filters: str | dict | None = None,
+	from_date: str | None = None,
+	to_date: str | None = None,
+	timespan: str | None = None,
+	time_interval: str | None = None,
+	heatmap_year: str | None = None,
 ):
 	if chart_name:
 		chart = frappe.get_doc("Dashboard Chart", chart_name)
diff --git a/erpnext/accounts/doctype/account/account.py b/erpnext/accounts/doctype/account/account.py
index 3e32f6b8817..efd7c32171c 100644
--- a/erpnext/accounts/doctype/account/account.py
+++ b/erpnext/accounts/doctype/account/account.py
@@ -471,7 +471,7 @@ class Account(NestedSet):
 
 @frappe.whitelist()
 @frappe.validate_and_sanitize_search_inputs
-def get_parent_account(doctype, txt, searchfield, start, page_len, filters):
+def get_parent_account(doctype: str, txt: str, searchfield: str, start: int, page_len: int, filters: dict):
 	return frappe.db.sql(
 		"""select name from tabAccount
 		where is_group = 1 and docstatus != 2 and company = {}
@@ -515,7 +515,9 @@ def get_account_autoname(account_number, account_name, company):
 
 
 @frappe.whitelist()
-def update_account_number(name, account_name, account_number=None, from_descendant=False):
+def update_account_number(
+	name: str, account_name: str, account_number: str | None = None, from_descendant: bool = False
+):
 	_ensure_idle_system()
 	account = frappe.get_cached_doc("Account", name)
 	if not account:
@@ -577,7 +579,7 @@ def update_account_number(name, account_name, account_number=None, from_descenda
 
 
 @frappe.whitelist()
-def merge_account(old, new):
+def merge_account(old: str, new: str):
 	_ensure_idle_system()
 	# Validate properties before merging
 	new_account = frappe.get_cached_doc("Account", new)
@@ -614,7 +616,7 @@ def merge_account(old, new):
 
 
 @frappe.whitelist()
-def get_root_company(company):
+def get_root_company(company: str):
 	# return the topmost company in the hierarchy
 	ancestors = get_ancestors_of("Company", company, "lft asc")
 	return [ancestors[0]] if ancestors else []
diff --git a/erpnext/accounts/doctype/account/chart_of_accounts/chart_of_accounts.py b/erpnext/accounts/doctype/account/chart_of_accounts/chart_of_accounts.py
index c905bc56943..1ee409a290c 100644
--- a/erpnext/accounts/doctype/account/chart_of_accounts/chart_of_accounts.py
+++ b/erpnext/accounts/doctype/account/chart_of_accounts/chart_of_accounts.py
@@ -99,7 +99,7 @@ def identify_is_group(child):
 
 
 @frappe.whitelist()
-def get_chart(chart_template, existing_company=None):
+def get_chart(chart_template: str | None, existing_company: str | None = None):
 	chart = {}
 	if existing_company:
 		return get_account_tree_from_existing_company(existing_company)
@@ -132,7 +132,7 @@ def get_chart(chart_template, existing_company=None):
 
 
 @frappe.whitelist()
-def get_charts_for_country(country, with_standard=False):
+def get_charts_for_country(country: str, with_standard: bool = False):
 	charts = []
 
 	def _get_chart_name(content):
@@ -225,7 +225,7 @@ def build_account_tree(tree, parent, all_accounts):
 
 
 @frappe.whitelist()
-def validate_bank_account(coa, bank_account):
+def validate_bank_account(coa: str, bank_account: str):
 	accounts = []
 	chart = get_chart(coa)
 
@@ -244,7 +244,9 @@ def validate_bank_account(coa, bank_account):
 
 
 @frappe.whitelist()
-def build_tree_from_json(chart_template, chart_data=None, from_coa_importer=False):
+def build_tree_from_json(
+	chart_template: str, chart_data: dict | None = None, from_coa_importer: bool = False
+):
 	"""get chart template from its folder and parse the json to be rendered as tree"""
 	chart = chart_data or get_chart(chart_template)
 
diff --git a/erpnext/accounts/doctype/accounting_dimension/accounting_dimension.py b/erpnext/accounts/doctype/accounting_dimension/accounting_dimension.py
index ff8094ba432..019f1da8f77 100644
--- a/erpnext/accounts/doctype/accounting_dimension/accounting_dimension.py
+++ b/erpnext/accounts/doctype/accounting_dimension/accounting_dimension.py
@@ -210,7 +210,7 @@ def delete_accounting_dimension(doc):
 
 
 @frappe.whitelist()
-def disable_dimension(doc):
+def disable_dimension(doc: str):
 	if frappe.in_test:
 		toggle_disabling(doc=doc)
 	else:
@@ -286,7 +286,7 @@ def get_dimension_with_children(doctype, dimensions):
 
 
 @frappe.whitelist()
-def get_dimensions(with_cost_center_and_project=False):
+def get_dimensions(with_cost_center_and_project: str | bool = False):
 	c = frappe.qb.DocType("Accounting Dimension Detail")
 	p = frappe.qb.DocType("Accounting Dimension")
 	dimension_filters = (
diff --git a/erpnext/accounts/doctype/bank_account/bank_account.py b/erpnext/accounts/doctype/bank_account/bank_account.py
index c0dc6467f8f..bc301d85896 100644
--- a/erpnext/accounts/doctype/bank_account/bank_account.py
+++ b/erpnext/accounts/doctype/bank_account/bank_account.py
@@ -115,7 +115,7 @@ def get_default_company_bank_account(company, party_type, party):
 
 
 @frappe.whitelist()
-def get_bank_account_details(bank_account):
+def get_bank_account_details(bank_account: str):
 	return frappe.get_cached_value(
 		"Bank Account", bank_account, ["account", "bank", "bank_account_no"], as_dict=1
 	)
diff --git a/erpnext/accounts/doctype/bank_reconciliation_tool/bank_reconciliation_tool.py b/erpnext/accounts/doctype/bank_reconciliation_tool/bank_reconciliation_tool.py
index 2fd49c962f7..86970d53edf 100644
--- a/erpnext/accounts/doctype/bank_reconciliation_tool/bank_reconciliation_tool.py
+++ b/erpnext/accounts/doctype/bank_reconciliation_tool/bank_reconciliation_tool.py
@@ -1,8 +1,8 @@
 # Copyright (c) 2020, Frappe Technologies Pvt. Ltd. and contributors
 # For license information, please see license.txt
 
-
 import json
+from datetime import date
 
 import frappe
 from frappe import _
@@ -47,7 +47,9 @@ class BankReconciliationTool(Document):
 
 
 @frappe.whitelist()
-def get_bank_transactions(bank_account, from_date=None, to_date=None):
+def get_bank_transactions(
+	bank_account: str, from_date: str | date | None = None, to_date: str | date | None = None
+):
 	# returns bank transactions for a bank account
 	filters = []
 	filters.append(["bank_account", "=", bank_account])
@@ -80,7 +82,7 @@ def get_bank_transactions(bank_account, from_date=None, to_date=None):
 
 
 @frappe.whitelist()
-def get_account_balance(bank_account, till_date, company):
+def get_account_balance(bank_account: str, till_date: str | date, company: str):
 	# returns account balance till the specified date
 	account = frappe.db.get_value("Bank Account", bank_account, "account")
 	filters = frappe._dict(
@@ -106,7 +108,9 @@ def get_account_balance(bank_account, till_date, company):
 
 
 @frappe.whitelist()
-def update_bank_transaction(bank_transaction_name, reference_number, party_type=None, party=None):
+def update_bank_transaction(
+	bank_transaction_name: str, reference_number: str, party_type: str | None = None, party: str | None = None
+):
 	# updates bank transaction based on the new parameters provided by the user from Vouchers
 	bank_transaction = frappe.get_doc("Bank Transaction", bank_transaction_name)
 	bank_transaction.reference_number = reference_number
@@ -135,16 +139,16 @@ def update_bank_transaction(bank_transaction_name, reference_number, party_type=
 
 @frappe.whitelist()
 def create_journal_entry_bts(
-	bank_transaction_name,
-	reference_number=None,
-	reference_date=None,
-	posting_date=None,
-	entry_type=None,
-	second_account=None,
-	mode_of_payment=None,
-	party_type=None,
-	party=None,
-	allow_edit=None,
+	bank_transaction_name: str,
+	reference_number: str | None = None,
+	reference_date: str | None = None,
+	posting_date: str | date | None = None,
+	entry_type: str | None = None,
+	second_account: str | None = None,
+	mode_of_payment: str | None = None,
+	party_type: str | None = None,
+	party: str | None = None,
+	allow_edit: bool | None = None,
 ):
 	# Create a new journal entry based on the bank transaction
 	bank_transaction = frappe.db.get_values(
@@ -294,17 +298,17 @@ def create_journal_entry_bts(
 
 @frappe.whitelist()
 def create_payment_entry_bts(
-	bank_transaction_name,
-	reference_number=None,
-	reference_date=None,
-	party_type=None,
-	party=None,
-	posting_date=None,
-	mode_of_payment=None,
-	project=None,
-	cost_center=None,
-	allow_edit=None,
-	company_bank_account=None,
+	bank_transaction_name: str,
+	reference_number: str | None = None,
+	reference_date: str | None = None,
+	party_type: str | None = None,
+	party: str | None = None,
+	posting_date: str | None = None,
+	mode_of_payment: str | None = None,
+	project: str | None = None,
+	cost_center: str | None = None,
+	allow_edit: bool | None = None,
+	company_bank_account: str | None = None,
 ):
 	# Create a new payment entry based on the bank transaction
 	bank_transaction = frappe.db.get_values(
@@ -371,12 +375,12 @@ def create_payment_entry_bts(
 
 @frappe.whitelist()
 def auto_reconcile_vouchers(
-	bank_account,
-	from_date=None,
-	to_date=None,
-	filter_by_reference_date=None,
-	from_reference_date=None,
-	to_reference_date=None,
+	bank_account: str,
+	from_date: str | date | None = None,
+	to_date: str | date | None = None,
+	filter_by_reference_date: bool | None = None,
+	from_reference_date: bool | None = None,
+	to_reference_date: str | None = None,
 ):
 	bank_transactions = get_bank_transactions(bank_account)
 
@@ -471,7 +475,7 @@ def get_auto_reconcile_message(partially_reconciled, reconciled):
 
 
 @frappe.whitelist()
-def reconcile_vouchers(bank_transaction_name, vouchers):
+def reconcile_vouchers(bank_transaction_name: str, vouchers: str):
 	# updated clear date of all the vouchers based on the bank transaction
 	vouchers = json.loads(vouchers)
 	transaction = frappe.get_doc("Bank Transaction", bank_transaction_name)
@@ -487,13 +491,13 @@ def reconcile_vouchers(bank_transaction_name, vouchers):
 
 @frappe.whitelist()
 def get_linked_payments(
-	bank_transaction_name,
-	document_types=None,
-	from_date=None,
-	to_date=None,
-	filter_by_reference_date=None,
-	from_reference_date=None,
-	to_reference_date=None,
+	bank_transaction_name: str,
+	document_types: list[str] | None = None,
+	from_date: str | date | None = None,
+	to_date: str | date | None = None,
+	filter_by_reference_date: bool | None = None,
+	from_reference_date: bool | None = None,
+	to_reference_date: str | None = None,
 ):
 	# get all matching payments for a bank transaction
 	transaction = frappe.get_doc("Bank Transaction", bank_transaction_name)
diff --git a/erpnext/accounts/doctype/bank_statement_import/bank_statement_import.py b/erpnext/accounts/doctype/bank_statement_import/bank_statement_import.py
index 9371148e256..facaf80c008 100644
--- a/erpnext/accounts/doctype/bank_statement_import/bank_statement_import.py
+++ b/erpnext/accounts/doctype/bank_statement_import/bank_statement_import.py
@@ -143,7 +143,7 @@ def preprocess_mt940_content(content: str) -> str:
 
 
 @frappe.whitelist()
-def convert_mt940_to_csv(data_import, mt940_file_path):
+def convert_mt940_to_csv(data_import: str, mt940_file_path: str):
 	doc = frappe.get_doc("Bank Statement Import", data_import)
 
 	_file_doc, content = get_file(mt940_file_path)
@@ -208,26 +208,28 @@ def convert_mt940_to_csv(data_import, mt940_file_path):
 
 
 @frappe.whitelist()
-def get_preview_from_template(data_import, import_file=None, google_sheets_url=None):
+def get_preview_from_template(
+	data_import: str, import_file: str | None = None, google_sheets_url: str | None = None
+):
 	return frappe.get_doc("Bank Statement Import", data_import).get_preview_from_template(
 		import_file, google_sheets_url
 	)
 
 
 @frappe.whitelist()
-def form_start_import(data_import):
+def form_start_import(data_import: str):
 	job_id = frappe.get_doc("Bank Statement Import", data_import).start_import()
 	return job_id is not None
 
 
 @frappe.whitelist()
-def download_errored_template(data_import_name):
+def download_errored_template(data_import_name: str):
 	data_import = frappe.get_doc("Bank Statement Import", data_import_name)
 	data_import.export_errored_rows()
 
 
 @frappe.whitelist()
-def download_import_log(data_import_name):
+def download_import_log(data_import_name: str):
 	return frappe.get_doc("Bank Statement Import", data_import_name).download_import_log()
 
 
@@ -363,7 +365,7 @@ def write_xlsx(data, sheet_name, wb=None, column_widths=None, file_path=None):
 
 
 @frappe.whitelist()
-def get_import_status(docname):
+def get_import_status(docname: str):
 	import_status = {}
 
 	data_import = frappe.get_doc("Bank Statement Import", docname)
diff --git a/erpnext/accounts/doctype/bank_transaction/bank_transaction_upload.py b/erpnext/accounts/doctype/bank_transaction/bank_transaction_upload.py
index a03f406b789..d0d0188cbd3 100644
--- a/erpnext/accounts/doctype/bank_transaction/bank_transaction_upload.py
+++ b/erpnext/accounts/doctype/bank_transaction/bank_transaction_upload.py
@@ -35,7 +35,7 @@ def upload_bank_statement():
 
 
 @frappe.whitelist()
-def create_bank_entries(columns, data, bank_account):
+def create_bank_entries(columns: str, data: str, bank_account: str):
 	header_map = get_header_mapping(columns, bank_account)
 
 	success = 0
diff --git a/erpnext/accounts/doctype/budget/budget.py b/erpnext/accounts/doctype/budget/budget.py
index 8a8a7f7b1ef..f2bf3bfbf36 100644
--- a/erpnext/accounts/doctype/budget/budget.py
+++ b/erpnext/accounts/doctype/budget/budget.py
@@ -845,7 +845,7 @@ def get_fiscal_year_date_range(from_fiscal_year, to_fiscal_year):
 
 
 @frappe.whitelist()
-def revise_budget(budget_name):
+def revise_budget(budget_name: str):
 	old_budget = frappe.get_doc("Budget", budget_name)
 
 	if old_budget.docstatus == 1:
diff --git a/erpnext/accounts/doctype/chart_of_accounts_importer/chart_of_accounts_importer.py b/erpnext/accounts/doctype/chart_of_accounts_importer/chart_of_accounts_importer.py
index 9c4f2f8fd49..d6ad87e9fbd 100644
--- a/erpnext/accounts/doctype/chart_of_accounts_importer/chart_of_accounts_importer.py
+++ b/erpnext/accounts/doctype/chart_of_accounts_importer/chart_of_accounts_importer.py
@@ -57,7 +57,7 @@ def validate_columns(data):
 
 
 @frappe.whitelist()
-def validate_company(company):
+def validate_company(company: str):
 	parent_company, allow_account_creation_against_child_company = frappe.get_cached_value(
 		"Company", company, ["parent_company", "allow_account_creation_against_child_company"]
 	)
@@ -74,7 +74,7 @@ def validate_company(company):
 
 
 @frappe.whitelist()
-def import_coa(file_name, company):
+def import_coa(file_name: str, company: str):
 	# delete existing data for accounts
 	unset_existing_data(company)
 
@@ -159,7 +159,9 @@ def generate_data_from_excel(file_doc, extension, as_dict=False):
 
 
 @frappe.whitelist()
-def get_coa(doctype, parent, is_root=False, file_name=None, for_validate=0):
+def get_coa(
+	doctype: str, parent: str, is_root: bool = False, file_name: str | None = None, for_validate: int = 0
+):
 	"""called by tree view (to fetch node's children)"""
 
 	file_doc, extension = get_file(file_name)
@@ -307,7 +309,7 @@ def build_response_as_excel(writer):
 
 
 @frappe.whitelist()
-def download_template(file_type, template_type, company):
+def download_template(file_type: str, template_type: str, company: str):
 	writer = get_template(template_type, company)
 
 	if file_type == "CSV":
@@ -361,7 +363,7 @@ def get_sample_template(writer, company):
 
 
 @frappe.whitelist()
-def validate_accounts(file_doc, extension):
+def validate_accounts(file_doc: Document, extension: str):
 	if extension == "csv":
 		accounts = generate_data_from_csv(file_doc, as_dict=True)
 	else:
diff --git a/erpnext/accounts/doctype/cheque_print_template/cheque_print_template.py b/erpnext/accounts/doctype/cheque_print_template/cheque_print_template.py
index 4b1394ede17..4e33af7265d 100644
--- a/erpnext/accounts/doctype/cheque_print_template/cheque_print_template.py
+++ b/erpnext/accounts/doctype/cheque_print_template/cheque_print_template.py
@@ -47,7 +47,7 @@ class ChequePrintTemplate(Document):
 
 
 @frappe.whitelist()
-def create_or_update_cheque_print_format(template_name):
+def create_or_update_cheque_print_format(template_name: str):
 	if not frappe.db.exists("Print Format", template_name):
 		cheque_print = frappe.new_doc("Print Format")
 		cheque_print.update(
diff --git a/erpnext/accounts/doctype/exchange_rate_revaluation/exchange_rate_revaluation.py b/erpnext/accounts/doctype/exchange_rate_revaluation/exchange_rate_revaluation.py
index 0c21bbb2e0b..69da27d5c68 100644
--- a/erpnext/accounts/doctype/exchange_rate_revaluation/exchange_rate_revaluation.py
+++ b/erpnext/accounts/doctype/exchange_rate_revaluation/exchange_rate_revaluation.py
@@ -1,6 +1,7 @@
 # Copyright (c) 2018, Frappe Technologies Pvt. Ltd. and contributors
 # For license information, please see license.txt
 
+from datetime import date
 
 import frappe
 from frappe import _, qb
@@ -614,7 +615,12 @@ def calculate_exchange_rate_using_last_gle(company, account, party_type, party):
 
 @frappe.whitelist()
 def get_account_details(
-	company, posting_date, account, party_type=None, party=None, rounding_loss_allowance: float | None = None
+	company: str,
+	posting_date: str | date,
+	account: str,
+	party_type: str | None = None,
+	party: str | None = None,
+	rounding_loss_allowance: float = 0.0,
 ):
 	if not (company and posting_date):
 		frappe.throw(_("Company and Posting Date is mandatory"))
diff --git a/erpnext/accounts/doctype/invoice_discounting/invoice_discounting.py b/erpnext/accounts/doctype/invoice_discounting/invoice_discounting.py
index 5d3c2b987ba..0eb90b139b9 100644
--- a/erpnext/accounts/doctype/invoice_discounting/invoice_discounting.py
+++ b/erpnext/accounts/doctype/invoice_discounting/invoice_discounting.py
@@ -317,7 +317,7 @@ class InvoiceDiscounting(AccountsController):
 
 
 @frappe.whitelist()
-def get_invoices(filters):
+def get_invoices(filters: str):
 	filters = frappe._dict(json.loads(filters))
 	cond = []
 	if filters.customer:
diff --git a/erpnext/accounts/doctype/journal_entry/journal_entry.py b/erpnext/accounts/doctype/journal_entry/journal_entry.py
index 6428896acae..4f6e8b7507e 100644
--- a/erpnext/accounts/doctype/journal_entry/journal_entry.py
+++ b/erpnext/accounts/doctype/journal_entry/journal_entry.py
@@ -1,12 +1,13 @@
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 # License: GNU General Public License v3. See license.txt
 
-
 import json
+from datetime import date
 
 import frappe
 from frappe import _, msgprint, scrub
 from frappe.core.doctype.submission_queue.submission_queue import queue_submission
+from frappe.model.document import Document
 from frappe.utils import comma_and, cstr, flt, fmt_money, formatdate, get_link_to_form, nowdate
 
 import erpnext
@@ -1215,7 +1216,7 @@ class JournalEntry(AccountsController):
 				cancel_exchange_gain_loss_journal(frappe._dict(doctype=self.doctype, name=self.name))
 
 	@frappe.whitelist()
-	def get_balance(self, difference_account=None):
+	def get_balance(self, difference_account: str | None = None):
 		if not self.get("accounts"):
 			msgprint(_("'Entries' cannot be empty"), raise_exception=True)
 		else:
@@ -1321,7 +1322,12 @@ class JournalEntry(AccountsController):
 
 @frappe.whitelist()
 def get_default_bank_cash_account(
-	company, account_type=None, mode_of_payment=None, account=None, *, fetch_balance=True
+	company: str,
+	account_type: str | None = None,
+	mode_of_payment: str | None = None,
+	account: str | None = None,
+	*,
+	fetch_balance: bool = True,
 ):
 	from erpnext.accounts.doctype.sales_invoice.sales_invoice import get_bank_cash_account
 
@@ -1370,7 +1376,12 @@ def get_default_bank_cash_account(
 
 @frappe.whitelist()
 def get_payment_entry_against_order(
-	dt, dn, amount=None, debit_in_account_currency=None, journal_entry=False, bank_account=None
+	dt: str,
+	dn: str,
+	amount: float | None = None,
+	debit_in_account_currency: str | float | None = None,
+	journal_entry: bool = False,
+	bank_account: str | None = None,
 ):
 	ref_doc = frappe.get_doc(dt, dn)
 
@@ -1415,7 +1426,12 @@ def get_payment_entry_against_order(
 
 @frappe.whitelist()
 def get_payment_entry_against_invoice(
-	dt, dn, amount=None, debit_in_account_currency=None, journal_entry=False, bank_account=None
+	dt: str,
+	dn: str,
+	amount: float | None = None,
+	debit_in_account_currency: str | None = None,
+	journal_entry: bool = False,
+	bank_account: str | None = None,
 ):
 	ref_doc = frappe.get_doc(dt, dn)
 	if dt == "Sales Invoice":
@@ -1528,7 +1544,7 @@ def get_payment_entry(ref_doc, args):
 
 @frappe.whitelist()
 @frappe.validate_and_sanitize_search_inputs
-def get_against_jv(doctype, txt, searchfield, start, page_len, filters):
+def get_against_jv(doctype: str, txt: str, searchfield: str, start: int, page_len: int, filters: dict):
 	if not frappe.db.has_column("Journal Entry", searchfield):
 		return []
 
@@ -1559,7 +1575,7 @@ def get_against_jv(doctype, txt, searchfield, start, page_len, filters):
 
 
 @frappe.whitelist()
-def get_outstanding(args):
+def get_outstanding(args: str | dict):
 	if not frappe.has_permission("Account"):
 		frappe.msgprint(_("No Permission"), raise_exception=1)
 
@@ -1619,7 +1635,7 @@ def get_outstanding(args):
 
 
 @frappe.whitelist()
-def get_party_account_and_currency(company, party_type, party):
+def get_party_account_and_currency(company: str, party_type: str, party: str):
 	if not frappe.has_permission("Account"):
 		frappe.msgprint(_("No Permission"), raise_exception=1)
 
@@ -1632,7 +1648,14 @@ def get_party_account_and_currency(company, party_type, party):
 
 
 @frappe.whitelist()
-def get_account_details_and_party_type(account, date, company, debit=None, credit=None, exchange_rate=None):
+def get_account_details_and_party_type(
+	account: str,
+	date: str,
+	company: str,
+	debit: float | str | None = None,
+	credit: float | str | None = None,
+	exchange_rate: float | str | None = None,
+):
 	"""Returns dict of account details and party type to be set in Journal Entry on selection of account."""
 	if not frappe.has_permission("Account"):
 		frappe.msgprint(_("No Permission"), raise_exception=1)
@@ -1681,15 +1704,15 @@ def get_account_details_and_party_type(account, date, company, debit=None, credi
 
 @frappe.whitelist()
 def get_exchange_rate(
-	posting_date,
-	account=None,
-	account_currency=None,
-	company=None,
-	reference_type=None,
-	reference_name=None,
-	debit=None,
-	credit=None,
-	exchange_rate=None,
+	posting_date: str | date,
+	account: str | None = None,
+	account_currency: str | None = None,
+	company: str | None = None,
+	reference_type: str | None = None,
+	reference_name: str | None = None,
+	debit: float | str | None = None,
+	credit: float | str | None = None,
+	exchange_rate: str | float | None = None,
 ):
 	# Ensure exchange_rate is always numeric to avoid calculation errors
 	if isinstance(exchange_rate, str):
@@ -1726,7 +1749,7 @@ def get_exchange_rate(
 
 
 @frappe.whitelist()
-def get_average_exchange_rate(account):
+def get_average_exchange_rate(account: str):
 	exchange_rate = 0
 	bank_balance_in_account_currency = get_balance_on(account)
 	if bank_balance_in_account_currency:
@@ -1737,7 +1760,7 @@ def get_average_exchange_rate(account):
 
 
 @frappe.whitelist()
-def make_inter_company_journal_entry(name, voucher_type, company):
+def make_inter_company_journal_entry(name: str, voucher_type: str, company: str):
 	journal_entry = frappe.new_doc("Journal Entry")
 	journal_entry.voucher_type = voucher_type
 	journal_entry.company = company
@@ -1747,7 +1770,7 @@ def make_inter_company_journal_entry(name, voucher_type, company):
 
 
 @frappe.whitelist()
-def make_reverse_journal_entry(source_name, target_doc=None):
+def make_reverse_journal_entry(source_name: str, target_doc: str | Document | None = None):
 	existing_reverse = frappe.db.exists("Journal Entry", {"reversal_of": source_name, "docstatus": 1})
 	if existing_reverse:
 		frappe.throw(
diff --git a/erpnext/accounts/doctype/ledger_merge/ledger_merge.py b/erpnext/accounts/doctype/ledger_merge/ledger_merge.py
index 008b4115f5f..d65c9f6780e 100644
--- a/erpnext/accounts/doctype/ledger_merge/ledger_merge.py
+++ b/erpnext/accounts/doctype/ledger_merge/ledger_merge.py
@@ -55,7 +55,7 @@ class LedgerMerge(Document):
 
 
 @frappe.whitelist()
-def form_start_merge(docname):
+def form_start_merge(docname: str):
 	return frappe.get_doc("Ledger Merge", docname).start_merge()
 
 
diff --git a/erpnext/accounts/doctype/loyalty_program/loyalty_program.py b/erpnext/accounts/doctype/loyalty_program/loyalty_program.py
index 701558f2c0b..543feb89fa1 100644
--- a/erpnext/accounts/doctype/loyalty_program/loyalty_program.py
+++ b/erpnext/accounts/doctype/loyalty_program/loyalty_program.py
@@ -1,6 +1,7 @@
 # Copyright (c) 2018, Frappe Technologies Pvt. Ltd. and contributors
 # For license information, please see license.txt
 
+from datetime import date
 
 import frappe
 from frappe import _
@@ -88,13 +89,13 @@ def get_loyalty_details(
 
 @frappe.whitelist()
 def get_loyalty_program_details_with_points(
-	customer,
-	loyalty_program=None,
-	expiry_date=None,
-	company=None,
-	silent=False,
-	include_expired_entry=False,
-	current_transaction_amount=0,
+	customer: str,
+	loyalty_program: str | None = None,
+	expiry_date: str | date | None = None,
+	company: str | None = None,
+	silent: bool = False,
+	include_expired_entry: bool = False,
+	current_transaction_amount: int | float = 0,
 ):
 	lp_details = get_loyalty_program_details(customer, loyalty_program, company=company, silent=silent)
 	loyalty_program = frappe.get_doc("Loyalty Program", loyalty_program)
@@ -119,12 +120,12 @@ def get_loyalty_program_details_with_points(
 
 @frappe.whitelist()
 def get_loyalty_program_details(
-	customer,
-	loyalty_program=None,
-	expiry_date=None,
-	company=None,
-	silent=False,
-	include_expired_entry=False,
+	customer: str,
+	loyalty_program: str | None = None,
+	expiry_date: str | date | None = None,
+	company: str | None = None,
+	silent: bool = False,
+	include_expired_entry: bool = False,
 ):
 	lp_details = frappe._dict()
 
@@ -146,7 +147,7 @@ def get_loyalty_program_details(
 
 
 @frappe.whitelist()
-def get_redeemption_factor(loyalty_program=None, customer=None):
+def get_redeemption_factor(loyalty_program: str | None = None, customer: str | None = None):
 	customer_loyalty_program = None
 	if not loyalty_program:
 		customer_loyalty_program = frappe.db.get_value("Customer", customer, "loyalty_program")
diff --git a/erpnext/accounts/doctype/opening_invoice_creation_tool/opening_invoice_creation_tool.py b/erpnext/accounts/doctype/opening_invoice_creation_tool/opening_invoice_creation_tool.py
index 2f3a893a73f..4b5c8bcfeb8 100644
--- a/erpnext/accounts/doctype/opening_invoice_creation_tool/opening_invoice_creation_tool.py
+++ b/erpnext/accounts/doctype/opening_invoice_creation_tool/opening_invoice_creation_tool.py
@@ -293,7 +293,7 @@ def publish(index, total, doctype):
 
 
 @frappe.whitelist()
-def get_temporary_opening_account(company=None):
+def get_temporary_opening_account(company: str | None = None):
 	if not company:
 		return
 
diff --git a/erpnext/accounts/doctype/party_link/party_link.py b/erpnext/accounts/doctype/party_link/party_link.py
index 1ed837eada7..8232c82f337 100644
--- a/erpnext/accounts/doctype/party_link/party_link.py
+++ b/erpnext/accounts/doctype/party_link/party_link.py
@@ -67,7 +67,7 @@ class PartyLink(Document):
 
 
 @frappe.whitelist()
-def create_party_link(primary_role, primary_party, secondary_party):
+def create_party_link(primary_role: str, primary_party: str, secondary_party: str):
 	party_link = frappe.new_doc("Party Link")
 	party_link.primary_role = primary_role
 	party_link.primary_party = primary_party
diff --git a/erpnext/accounts/doctype/payment_entry/payment_entry.py b/erpnext/accounts/doctype/payment_entry/payment_entry.py
index b0d754a3f23..9cb2fdd8823 100644
--- a/erpnext/accounts/doctype/payment_entry/payment_entry.py
+++ b/erpnext/accounts/doctype/payment_entry/payment_entry.py
@@ -1,12 +1,13 @@
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and contributors
 # For license information, please see license.txt
 
-
 import json
+from datetime import date
 from functools import reduce
 
 import frappe
 from frappe import ValidationError, _, qb, scrub, throw
+from frappe.model.document import Document
 from frappe.model.meta import get_field_precision
 from frappe.query_builder import Tuple
 from frappe.query_builder.functions import Count
@@ -1867,7 +1868,9 @@ class PaymentEntry(AccountsController):
 		frappe.response["matched_payment_requests"] = matched_payment_requests
 
 	@frappe.whitelist()
-	def allocate_amount_to_references(self, paid_amount, paid_amount_change, allocate_payment_amount):
+	def allocate_amount_to_references(
+		self, paid_amount: float, paid_amount_change: bool, allocate_payment_amount: bool
+	):
 		"""
 		Allocate `Allocated Amount` and `Payment Request` against `Reference` based on `Paid Amount` and `Outstanding Amount`.\n
 		:param paid_amount: Paid Amount / Received Amount.
@@ -2039,7 +2042,7 @@ class PaymentEntry(AccountsController):
 				)
 
 	@frappe.whitelist()
-	def set_matched_payment_requests(self, matched_payment_requests):
+	def set_matched_payment_requests(self, matched_payment_requests: str | list | None):
 		"""
 		Set `Payment Request` against `Reference` based on `matched_payment_requests`.\n
 		:param matched_payment_requests: List of tuple of matched Payment Requests.
@@ -2255,7 +2258,7 @@ def validate_inclusive_tax(tax, doc):
 
 
 @frappe.whitelist()
-def get_outstanding_reference_documents(args, validate=False):
+def get_outstanding_reference_documents(args: str | dict, validate: bool = False):
 	if isinstance(args, str):
 		args = json.loads(args)
 
@@ -2670,7 +2673,7 @@ def get_negative_outstanding_invoices(
 
 
 @frappe.whitelist()
-def get_party_details(company, party_type, party, date, cost_center=None):
+def get_party_details(company: str, party_type: str, party: str, date: str, cost_center: str | None = None):
 	bank_account = ""
 	party_bank_account = ""
 
@@ -2696,7 +2699,7 @@ def get_party_details(company, party_type, party, date, cost_center=None):
 
 
 @frappe.whitelist()
-def get_account_details(account, date, cost_center=None):
+def get_account_details(account: str, date: str | date, cost_center: str | None = None):
 	frappe.has_permission("Payment Entry", throw=True)
 
 	# to check if the passed account is accessible under reference doctype Payment Entry
@@ -2716,7 +2719,7 @@ def get_account_details(account, date, cost_center=None):
 
 
 @frappe.whitelist()
-def get_company_defaults(company):
+def get_company_defaults(company: str):
 	fields = ["write_off_account", "exchange_gain_loss_account", "cost_center"]
 	return frappe.get_cached_value("Company", company, fields, as_dict=1)
 
@@ -2755,7 +2758,11 @@ def get_outstanding_on_journal_entry(voucher_no, party_type, party):
 
 @frappe.whitelist()
 def get_reference_details(
-	reference_doctype, reference_name, party_account_currency, party_type=None, party=None
+	reference_doctype: str,
+	reference_name: str,
+	party_account_currency: str,
+	party_type: str | None = None,
+	party: str | None = None,
 ):
 	total_amount = outstanding_amount = exchange_rate = account = None
 
@@ -2846,15 +2853,15 @@ def get_reference_details(
 
 @frappe.whitelist()
 def get_payment_entry(
-	dt,
-	dn,
-	party_amount=None,
-	bank_account=None,
-	bank_amount=None,
-	party_type=None,
-	payment_type=None,
-	reference_date=None,
-	created_from_payment_request=False,
+	dt: str,
+	dn: str,
+	party_amount: int | float | None = None,
+	bank_account: str | None = None,
+	bank_amount: int | float | None = None,
+	party_type: str | None = None,
+	payment_type: str | None = None,
+	reference_date: str | date | None = None,
+	created_from_payment_request: bool | None = None,
 ):
 	doc = frappe.get_doc(dt, dn)
 	over_billing_allowance = frappe.get_single_value("Accounts Settings", "over_billing_allowance")
@@ -3520,7 +3527,7 @@ def get_paid_amount(dt, dn, party_type, party, account, due_date):
 
 
 @frappe.whitelist()
-def make_payment_order(source_name, target_doc=None):
+def make_payment_order(source_name: str, target_doc: str | Document | None = None):
 	from frappe.model.mapper import get_mapped_doc
 
 	def set_missing_values(source, target):
diff --git a/erpnext/accounts/doctype/payment_order/payment_order.py b/erpnext/accounts/doctype/payment_order/payment_order.py
index a4c596249b1..5f1651a9f7c 100644
--- a/erpnext/accounts/doctype/payment_order/payment_order.py
+++ b/erpnext/accounts/doctype/payment_order/payment_order.py
@@ -59,7 +59,7 @@ class PaymentOrder(Document):
 
 @frappe.whitelist()
 @frappe.validate_and_sanitize_search_inputs
-def get_mop_query(doctype, txt, searchfield, start, page_len, filters):
+def get_mop_query(doctype: str, txt: str, searchfield: str, start: int, page_len: int, filters: dict):
 	return frappe.db.sql(
 		""" select mode_of_payment from `tabPayment Order Reference`
 		where parent = %(parent)s and mode_of_payment like %(txt)s
@@ -70,7 +70,7 @@ def get_mop_query(doctype, txt, searchfield, start, page_len, filters):
 
 @frappe.whitelist()
 @frappe.validate_and_sanitize_search_inputs
-def get_supplier_query(doctype, txt, searchfield, start, page_len, filters):
+def get_supplier_query(doctype: str, txt: str, searchfield: str, start: int, page_len: int, filters: dict):
 	return frappe.db.sql(
 		""" select supplier from `tabPayment Order Reference`
 		where parent = %(parent)s and supplier like %(txt)s and
@@ -81,7 +81,7 @@ def get_supplier_query(doctype, txt, searchfield, start, page_len, filters):
 
 
 @frappe.whitelist()
-def make_payment_records(name, supplier, mode_of_payment=None):
+def make_payment_records(name: str, supplier: str, mode_of_payment: str | None = None):
 	doc = frappe.get_doc("Payment Order", name)
 	make_journal_entry(doc, supplier, mode_of_payment)
 
diff --git a/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py b/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py
index cbb579a2d09..d1ffca800a3 100644
--- a/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py
+++ b/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py
@@ -433,7 +433,9 @@ class PaymentReconciliation(Document):
 		return frappe.get_single_value("Accounts Settings", "auto_reconcile_payments")
 
 	@frappe.whitelist()
-	def calculate_difference_on_allocation_change(self, payment_entry, invoice, allocated_amount):
+	def calculate_difference_on_allocation_change(
+		self, payment_entry: list, invoice: list, allocated_amount: float
+	):
 		invoice_exchange_map = self.get_invoice_exchange_map(invoice, payment_entry)
 		invoice[0]["exchange_rate"] = invoice_exchange_map.get(invoice[0].get("invoice_number"))
 		if payment_entry[0].get("reference_type") in ["Sales Invoice", "Purchase Invoice"]:
@@ -445,7 +447,7 @@ class PaymentReconciliation(Document):
 		return new_difference_amount
 
 	@frappe.whitelist()
-	def allocate_entries(self, args):
+	def allocate_entries(self, args: dict):
 		self.validate_entries()
 
 		exc_gain_loss_posting_date = frappe.db.get_single_value(
diff --git a/erpnext/accounts/doctype/payment_request/payment_request.py b/erpnext/accounts/doctype/payment_request/payment_request.py
index c95945bf6e2..c09391a8d41 100644
--- a/erpnext/accounts/doctype/payment_request/payment_request.py
+++ b/erpnext/accounts/doctype/payment_request/payment_request.py
@@ -937,7 +937,7 @@ def get_payment_gateway_account(filter):
 
 
 @frappe.whitelist()
-def get_print_format_list(ref_doctype):
+def get_print_format_list(ref_doctype: str):
 	print_format_list = ["Standard"]
 
 	print_format_list.extend(
@@ -948,12 +948,12 @@ def get_print_format_list(ref_doctype):
 
 
 @frappe.whitelist()
-def resend_payment_email(docname):
+def resend_payment_email(docname: str):
 	return frappe.get_doc("Payment Request", docname).send_email()
 
 
 @frappe.whitelist()
-def make_payment_entry(docname):
+def make_payment_entry(docname: str):
 	doc = frappe.get_doc("Payment Request", docname)
 	return doc.create_payment_entry(submit=False).as_dict()
 
@@ -1046,7 +1046,7 @@ def get_dummy_message(doc):
 
 
 @frappe.whitelist()
-def get_subscription_details(reference_doctype, reference_name):
+def get_subscription_details(reference_doctype: str, reference_name: str):
 	if reference_doctype == "Sales Invoice":
 		subscriptions = frappe.db.sql(
 			"""SELECT parent as sub_name FROM `tabSubscription Invoice` WHERE invoice=%s""",
@@ -1062,7 +1062,7 @@ def get_subscription_details(reference_doctype, reference_name):
 
 
 @frappe.whitelist()
-def make_payment_order(source_name, target_doc=None):
+def make_payment_order(source_name: str, target_doc: str | Document | None = None):
 	from frappe.model.mapper import get_mapped_doc
 
 	def set_missing_values(source, target):
@@ -1110,7 +1110,9 @@ def validate_payment(doc, method=None):
 
 
 @frappe.whitelist()
-def get_open_payment_requests_query(doctype, txt, searchfield, start, page_len, filters):
+def get_open_payment_requests_query(
+	doctype: str, txt: str, searchfield: str, start: int, page_len: int, filters: dict
+):
 	# permission checks in `get_list()`
 	filters = frappe._dict(filters)
 
diff --git a/erpnext/accounts/doctype/period_closing_voucher/period_closing_voucher.py b/erpnext/accounts/doctype/period_closing_voucher/period_closing_voucher.py
index d29a96b7e8d..760f7523be0 100644
--- a/erpnext/accounts/doctype/period_closing_voucher/period_closing_voucher.py
+++ b/erpnext/accounts/doctype/period_closing_voucher/period_closing_voucher.py
@@ -515,7 +515,7 @@ def delete_closing_entries(voucher_no):
 
 
 @frappe.whitelist()
-def get_period_start_end_date(fiscal_year, company):
+def get_period_start_end_date(fiscal_year: str, company: str):
 	fy_start_date, fy_end_date = frappe.db.get_value(
 		"Fiscal Year", fiscal_year, ["year_start_date", "year_end_date"]
 	)
diff --git a/erpnext/accounts/doctype/pos_closing_entry/pos_closing_entry.py b/erpnext/accounts/doctype/pos_closing_entry/pos_closing_entry.py
index ea93b23aa11..566688fd1fe 100644
--- a/erpnext/accounts/doctype/pos_closing_entry/pos_closing_entry.py
+++ b/erpnext/accounts/doctype/pos_closing_entry/pos_closing_entry.py
@@ -2,6 +2,8 @@
 # For license information, please see license.txt
 
 
+from datetime import datetime
+
 import frappe
 from frappe import _
 from frappe.query_builder import DocType
@@ -252,13 +254,13 @@ class POSClosingEntry(StatusUpdater):
 
 @frappe.whitelist()
 @frappe.validate_and_sanitize_search_inputs
-def get_cashiers(doctype, txt, searchfield, start, page_len, filters):
+def get_cashiers(doctype: str, txt: str, searchfield: str, start: int, page_len: int, filters: dict):
 	cashiers_list = frappe.get_all("POS Profile User", filters=filters, fields=["user"], as_list=1)
 	return [c for c in cashiers_list]
 
 
 @frappe.whitelist()
-def get_invoices(start, end, pos_profile, user):
+def get_invoices(start: str | datetime, end: str | datetime, pos_profile: str, user: str):
 	invoice_doctype = frappe.db.get_single_value("POS Settings", "invoice_type")
 
 	sales_inv_query = build_invoice_query("Sales Invoice", user, pos_profile, start, end)
diff --git a/erpnext/accounts/doctype/pos_invoice/pos_invoice.py b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
index 503c19c7ff8..53c1d75db4e 100644
--- a/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
+++ b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
@@ -4,6 +4,7 @@
 
 import frappe
 from frappe import _, bold
+from frappe.model.document import Document
 from frappe.model.mapper import map_child_doc, map_doc
 from frappe.query_builder.functions import IfNull, Sum
 from frappe.utils import cint, flt, get_link_to_form, getdate, nowdate
@@ -753,7 +754,7 @@ class POSInvoice(SalesInvoice):
 		return profile
 
 	@frappe.whitelist()
-	def set_missing_values(self, for_validate=False):
+	def set_missing_values(self, for_validate: bool = False):
 		profile = self.set_pos_fields(for_validate)
 
 		if not self.debit_to:
@@ -854,7 +855,7 @@ class POSInvoice(SalesInvoice):
 			return frappe.get_doc("Payment Request", pr)
 
 	@frappe.whitelist()
-	def update_payments(self, payments):
+	def update_payments(self, payments: list):
 		if self.status == "Consolidated":
 			frappe.throw(_("Create Payment Entry for Consolidated POS Invoices."))
 
@@ -897,7 +898,7 @@ class POSInvoice(SalesInvoice):
 
 
 @frappe.whitelist()
-def get_stock_availability(item_code, warehouse):
+def get_stock_availability(item_code: str | None, warehouse: str):
 	if frappe.db.get_value("Item", item_code, "is_stock_item"):
 		is_stock_item = True
 		bin_qty = get_bin_qty(item_code, warehouse)
@@ -1020,14 +1021,14 @@ def get_pos_reserved_qty_from_table(child_table, item_code, warehouse):
 
 
 @frappe.whitelist()
-def make_sales_return(source_name, target_doc=None):
+def make_sales_return(source_name: str, target_doc: Document | None = None):
 	from erpnext.controllers.sales_and_purchase_return import make_return_doc
 
 	return make_return_doc("POS Invoice", source_name, target_doc)
 
 
 @frappe.whitelist()
-def make_merge_log(invoices):
+def make_merge_log(invoices: str | list):
 	import json
 
 	if isinstance(invoices, str):
@@ -1077,7 +1078,15 @@ def add_return_modes(doc, pos_profile):
 
 @frappe.whitelist()
 @frappe.validate_and_sanitize_search_inputs
-def item_query(doctype, txt, searchfield, start, page_len, filters, as_dict=False):
+def item_query(
+	doctype: str,
+	txt: str,
+	searchfield: str,
+	start: int,
+	page_len: int,
+	filters: dict,
+	as_dict: bool = False,
+):
 	if pos_profile := filters.get("pos_profile")[1]:
 		pos_profile = frappe.get_cached_doc("POS Profile", pos_profile)
 		if item_groups := get_item_group(pos_profile):
diff --git a/erpnext/accounts/doctype/pos_profile/pos_profile.py b/erpnext/accounts/doctype/pos_profile/pos_profile.py
index 128d77589eb..7a51edfb169 100644
--- a/erpnext/accounts/doctype/pos_profile/pos_profile.py
+++ b/erpnext/accounts/doctype/pos_profile/pos_profile.py
@@ -275,7 +275,7 @@ def get_child_nodes(group_type, root):
 
 @frappe.whitelist()
 @frappe.validate_and_sanitize_search_inputs
-def pos_profile_query(doctype, txt, searchfield, start, page_len, filters):
+def pos_profile_query(doctype: str, txt: str, searchfield: str, start: int, page_len: int, filters: dict):
 	user = frappe.session["user"]
 	company = filters.get("company") or frappe.defaults.get_user_default("company")
 
@@ -319,7 +319,7 @@ def pos_profile_query(doctype, txt, searchfield, start, page_len, filters):
 
 
 @frappe.whitelist()
-def set_default_profile(pos_profile, company):
+def set_default_profile(pos_profile: str, company: str):
 	modified = now()
 	user = frappe.session.user
 
diff --git a/erpnext/accounts/doctype/pricing_rule/pricing_rule.py b/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
index 5a4f3ca3249..7f46a0159a7 100644
--- a/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
+++ b/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
@@ -320,7 +320,7 @@ class PricingRule(Document):
 
 
 @frappe.whitelist()
-def apply_pricing_rule(args, doc=None):
+def apply_pricing_rule(args: str | dict, doc: str | dict | Document | None = None):
 	"""
 	args = {
 	        "items": [{"doctype": "", "name": "", "item_code": "", "brand": "", "item_group": ""}, ...],
@@ -618,7 +618,12 @@ def apply_price_discount_rule(pricing_rule, item_details, args):
 
 
 @frappe.whitelist()
-def remove_pricing_rule_for_item(pricing_rules, item_details, item_code=None, rate=None):
+def remove_pricing_rule_for_item(
+	pricing_rules: str | None,
+	item_details: str | frappe._dict,
+	item_code: str | None = None,
+	rate: float | None = None,
+):
 	from erpnext.accounts.doctype.pricing_rule.utils import (
 		get_applied_pricing_rules,
 		get_pricing_rule_items,
@@ -666,7 +671,7 @@ def remove_pricing_rule_for_item(pricing_rules, item_details, item_code=None, ra
 
 
 @frappe.whitelist()
-def remove_pricing_rules(item_list):
+def remove_pricing_rules(item_list: str | list):
 	if isinstance(item_list, str):
 		item_list = json.loads(item_list)
 
@@ -704,7 +709,7 @@ def set_transaction_type(args):
 
 @frappe.whitelist()
 @frappe.validate_and_sanitize_search_inputs
-def get_item_uoms(doctype, txt, searchfield, start, page_len, filters):
+def get_item_uoms(doctype: str, txt: str, searchfield: str, start: int, page_len: int, filters: dict):
 	items = [filters.get("value")]
 	if filters.get("apply_on") != "Item Code":
 		field = frappe.scrub(filters.get("apply_on"))
diff --git a/erpnext/accounts/doctype/process_statement_of_accounts/process_statement_of_accounts.py b/erpnext/accounts/doctype/process_statement_of_accounts/process_statement_of_accounts.py
index 3a4b2941b3b..3994538059c 100644
--- a/erpnext/accounts/doctype/process_statement_of_accounts/process_statement_of_accounts.py
+++ b/erpnext/accounts/doctype/process_statement_of_accounts/process_statement_of_accounts.py
@@ -420,7 +420,7 @@ def get_context(customer, doc):
 
 
 @frappe.whitelist()
-def fetch_customers(customer_collection, collection_name, primary_mandatory):
+def fetch_customers(customer_collection: str, collection_name: str, primary_mandatory: str | int):
 	customer_list = []
 	customers = []
 
@@ -460,7 +460,7 @@ def fetch_customers(customer_collection, collection_name, primary_mandatory):
 
 
 @frappe.whitelist()
-def get_customer_emails(customer_name, primary_mandatory, billing_and_primary=True):
+def get_customer_emails(customer_name: str, primary_mandatory: str | int, billing_and_primary: bool = True):
 	"""Returns first email from Contact Email table as a Billing email
 	when Is Billing Contact checked
 	and Primary email- email with Is Primary checked"""
@@ -506,7 +506,7 @@ def get_customer_emails(customer_name, primary_mandatory, billing_and_primary=Tr
 
 
 @frappe.whitelist()
-def download_statements(document_name):
+def download_statements(document_name: str):
 	doc = frappe.get_doc("Process Statement Of Accounts", document_name)
 	report = get_report_pdf(doc)
 	if report:
@@ -516,7 +516,7 @@ def download_statements(document_name):
 
 
 @frappe.whitelist()
-def send_emails(document_name, from_scheduler=False, posting_date=None):
+def send_emails(document_name: str, from_scheduler: bool = False, posting_date: str | None = None):
 	doc = frappe.get_doc("Process Statement Of Accounts", document_name)
 	report = get_report_pdf(doc, consolidated=False)
 
diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
index 2d6d9fd8c51..2134578efac 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
@@ -6,6 +6,7 @@ import json
 
 import frappe
 from frappe import _, qb, throw
+from frappe.model.document import Document
 from frappe.model.mapper import get_mapped_doc
 from frappe.query_builder.functions import Sum
 from frappe.utils import cint, cstr, flt, formatdate, get_link_to_form, getdate, nowdate
@@ -1941,14 +1942,14 @@ def make_regional_gl_entries(gl_entries, doc):
 
 
 @frappe.whitelist()
-def make_debit_note(source_name, target_doc=None):
+def make_debit_note(source_name: str, target_doc: str | Document | None = None):
 	from erpnext.controllers.sales_and_purchase_return import make_return_doc
 
 	return make_return_doc("Purchase Invoice", source_name, target_doc)
 
 
 @frappe.whitelist()
-def make_stock_entry(source_name, target_doc=None):
+def make_stock_entry(source_name: str, target_doc: str | Document | None = None):
 	doc = get_mapped_doc(
 		"Purchase Invoice",
 		source_name,
@@ -1966,35 +1967,37 @@ def make_stock_entry(source_name, target_doc=None):
 
 
 @frappe.whitelist()
-def change_release_date(name, release_date=None):
+def change_release_date(name: str, release_date: str | None = None):
 	if frappe.db.exists("Purchase Invoice", name):
 		pi = frappe.get_lazy_doc("Purchase Invoice", name)
 		pi.db_set("release_date", release_date)
 
 
 @frappe.whitelist()
-def unblock_invoice(name):
+def unblock_invoice(name: str):
 	if frappe.db.exists("Purchase Invoice", name):
 		pi = frappe.get_lazy_doc("Purchase Invoice", name)
 		pi.unblock_invoice()
 
 
 @frappe.whitelist()
-def block_invoice(name, release_date, hold_comment=None):
+def block_invoice(name: str, release_date: str, hold_comment: str | None = None):
 	if frappe.db.exists("Purchase Invoice", name):
 		pi = frappe.get_lazy_doc("Purchase Invoice", name)
 		pi.block_invoice(hold_comment, release_date)
 
 
 @frappe.whitelist()
-def make_inter_company_sales_invoice(source_name, target_doc=None):
+def make_inter_company_sales_invoice(source_name: str, target_doc: Document | None = None):
 	from erpnext.accounts.doctype.sales_invoice.sales_invoice import make_inter_company_transaction
 
 	return make_inter_company_transaction("Purchase Invoice", source_name, target_doc)
 
 
 @frappe.whitelist()
-def make_purchase_receipt(source_name, target_doc=None, args=None):
+def make_purchase_receipt(
+	source_name: str, target_doc: str | Document | None = None, args: str | dict | None = None
+):
 	if args is None:
 		args = {}
 	if isinstance(args, str):
diff --git a/erpnext/accounts/doctype/repost_accounting_ledger/repost_accounting_ledger.py b/erpnext/accounts/doctype/repost_accounting_ledger/repost_accounting_ledger.py
index 4ffd8ff02c7..78d0a0c225e 100644
--- a/erpnext/accounts/doctype/repost_accounting_ledger/repost_accounting_ledger.py
+++ b/erpnext/accounts/doctype/repost_accounting_ledger/repost_accounting_ledger.py
@@ -152,7 +152,7 @@ class RepostAccountingLedger(Document):
 
 
 @frappe.whitelist()
-def start_repost(account_repost_doc=str) -> None:
+def start_repost(account_repost_doc: str | None = None) -> None:
 	from erpnext.accounts.general_ledger import make_reverse_gl_entries
 
 	frappe.flags.through_repost_accounting_ledger = True
@@ -286,7 +286,9 @@ def validate_docs_for_voucher_types(doc_voucher_types):
 
 @frappe.whitelist()
 @frappe.validate_and_sanitize_search_inputs
-def get_repost_allowed_types(doctype, txt, searchfield, start, page_len, filters):
+def get_repost_allowed_types(
+	doctype: str, txt: str, searchfield: str, start: int, page_len: int, filters: dict
+):
 	filters = {"allowed": True}
 
 	if txt:
diff --git a/erpnext/accounts/doctype/repost_payment_ledger/repost_payment_ledger.py b/erpnext/accounts/doctype/repost_payment_ledger/repost_payment_ledger.py
index 6fd1b0f2bf2..5f2ec5316ff 100644
--- a/erpnext/accounts/doctype/repost_payment_ledger/repost_payment_ledger.py
+++ b/erpnext/accounts/doctype/repost_payment_ledger/repost_payment_ledger.py
@@ -21,7 +21,7 @@ def repost_ple_for_voucher(voucher_type, voucher_no, gle_map=None):
 
 
 @frappe.whitelist()
-def start_payment_ledger_repost(docname=None):
+def start_payment_ledger_repost(docname: str | None = None):
 	"""
 	Repost Payment Ledger Entries for Vouchers through Background Job
 	"""
@@ -119,7 +119,7 @@ class RepostPaymentLedger(Document):
 
 
 @frappe.whitelist()
-def execute_repost_payment_ledger(docname):
+def execute_repost_payment_ledger(docname: str):
 	"""Repost Payment Ledger Entries by background job."""
 
 	job_name = "payment_ledger_repost_" + docname
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index b6261cc5707..89098c08ab9 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -6,6 +6,7 @@ import frappe
 import frappe.utils
 from frappe import _, msgprint, throw
 from frappe.contacts.doctype.address.address import get_address_display
+from frappe.model.document import Document
 from frappe.model.mapper import get_mapped_doc
 from frappe.model.utils import get_fetch_values
 from frappe.query_builder import Case
@@ -741,7 +742,7 @@ class SalesInvoice(SellingController):
 				pos_invoice_doc.cancel()
 
 	@frappe.whitelist()
-	def set_missing_values(self, for_validate=False):
+	def set_missing_values(self, for_validate: bool = False):
 		pos = self.set_pos_fields(for_validate)
 
 		if not self.debit_to:
@@ -2409,7 +2410,7 @@ def get_list_context(context=None):
 
 
 @frappe.whitelist()
-def get_bank_cash_account(mode_of_payment, company):
+def get_bank_cash_account(mode_of_payment: str, company: str):
 	account = frappe.db.get_value(
 		"Mode of Payment Account", {"parent": mode_of_payment, "company": company}, "default_account"
 	)
@@ -2424,7 +2425,7 @@ def get_bank_cash_account(mode_of_payment, company):
 
 
 @frappe.whitelist()
-def make_maintenance_schedule(source_name, target_doc=None):
+def make_maintenance_schedule(source_name: str, target_doc: str | Document | None = None):
 	doclist = get_mapped_doc(
 		"Sales Invoice",
 		source_name,
@@ -2441,7 +2442,7 @@ def make_maintenance_schedule(source_name, target_doc=None):
 
 
 @frappe.whitelist()
-def make_delivery_note(source_name, target_doc=None):
+def make_delivery_note(source_name: str, target_doc: Document | None = None):
 	def set_missing_values(source, target):
 		target.run_method("set_missing_values")
 		target.run_method("set_po_nos")
@@ -2490,7 +2491,7 @@ def make_delivery_note(source_name, target_doc=None):
 
 
 @frappe.whitelist()
-def make_sales_return(source_name, target_doc=None):
+def make_sales_return(source_name: str, target_doc: Document | None = None):
 	from erpnext.controllers.sales_and_purchase_return import make_return_doc
 
 	return make_return_doc("Sales Invoice", source_name, target_doc)
@@ -2584,7 +2585,7 @@ def validate_inter_company_transaction(doc, doctype):
 
 
 @frappe.whitelist()
-def make_inter_company_purchase_invoice(source_name, target_doc=None):
+def make_inter_company_purchase_invoice(source_name: str, target_doc: Document | None = None):
 	return make_inter_company_transaction("Sales Invoice", source_name, target_doc)
 
 
@@ -2962,7 +2963,7 @@ def update_address(doc, address_field, address_display_field, address_name):
 
 
 @frappe.whitelist()
-def get_loyalty_programs(customer):
+def get_loyalty_programs(customer: str):
 	"""sets applicable loyalty program to the customer or returns a list of applicable programs"""
 	from erpnext.selling.doctype.customer.customer import get_loyalty_programs
 
@@ -2980,7 +2981,7 @@ def get_loyalty_programs(customer):
 
 
 @frappe.whitelist()
-def create_invoice_discounting(source_name, target_doc=None):
+def create_invoice_discounting(source_name: str, target_doc: str | Document | None = None):
 	invoice = frappe.get_doc("Sales Invoice", source_name)
 	invoice_discounting = frappe.new_doc("Invoice Discounting")
 	invoice_discounting.company = invoice.company
@@ -3072,7 +3073,9 @@ def get_mode_of_payment_info(mode_of_payment, company):
 
 
 @frappe.whitelist()
-def create_dunning(source_name, target_doc=None, ignore_permissions=False):
+def create_dunning(
+	source_name: str, target_doc: str | Document | None = None, ignore_permissions: bool = False
+):
 	from frappe.model.mapper import get_mapped_doc
 
 	def postprocess_dunning(source, target):
diff --git a/erpnext/accounts/doctype/share_transfer/share_transfer.py b/erpnext/accounts/doctype/share_transfer/share_transfer.py
index bc8659406f8..c2f5510f852 100644
--- a/erpnext/accounts/doctype/share_transfer/share_transfer.py
+++ b/erpnext/accounts/doctype/share_transfer/share_transfer.py
@@ -342,14 +342,14 @@ class ShareTransfer(Document):
 
 @frappe.whitelist()
 def make_jv_entry(
-	company,
-	account,
-	amount,
-	payment_account,
-	credit_applicant_type,
-	credit_applicant,
-	debit_applicant_type,
-	debit_applicant,
+	company: str,
+	account: str,
+	amount: float,
+	payment_account: str,
+	credit_applicant_type: str,
+	credit_applicant: str,
+	debit_applicant_type: str,
+	debit_applicant: str,
 ):
 	journal_entry = frappe.new_doc("Journal Entry")
 	journal_entry.voucher_type = "Journal Entry"
diff --git a/erpnext/accounts/doctype/subscription_plan/subscription_plan.py b/erpnext/accounts/doctype/subscription_plan/subscription_plan.py
index cdfa3e56d9f..932caaa2db2 100644
--- a/erpnext/accounts/doctype/subscription_plan/subscription_plan.py
+++ b/erpnext/accounts/doctype/subscription_plan/subscription_plan.py
@@ -1,6 +1,7 @@
 # Copyright (c) 2018, Frappe Technologies Pvt. Ltd. and contributors
 # For license information, please see license.txt
 
+from datetime import date
 
 import frappe
 from dateutil import relativedelta
@@ -43,7 +44,13 @@ class SubscriptionPlan(Document):
 
 @frappe.whitelist()
 def get_plan_rate(
-	plan, quantity=1, customer=None, start_date=None, end_date=None, prorate_factor=1, party=None
+	plan: str,
+	quantity: int = 1,
+	customer: str | None = None,
+	start_date: str | date | None = None,
+	end_date: str | date | None = None,
+	prorate_factor: float = 1,
+	party: str | None = None,
 ):
 	plan = frappe.get_doc("Subscription Plan", plan)
 	if plan.price_determination == "Fixed Rate":
diff --git a/erpnext/accounts/doctype/tax_rule/tax_rule.py b/erpnext/accounts/doctype/tax_rule/tax_rule.py
index f122e41ef70..6863aa15b28 100644
--- a/erpnext/accounts/doctype/tax_rule/tax_rule.py
+++ b/erpnext/accounts/doctype/tax_rule/tax_rule.py
@@ -135,7 +135,7 @@ class TaxRule(Document):
 
 
 @frappe.whitelist()
-def get_party_details(party, party_type, args=None):
+def get_party_details(party: str, party_type: str, args: dict | None = None):
 	out = {}
 	billing_address, shipping_address = None, None
 	if args:
diff --git a/erpnext/accounts/doctype/unreconcile_payment/unreconcile_payment.py b/erpnext/accounts/doctype/unreconcile_payment/unreconcile_payment.py
index 02cad39de8f..6be667d97fb 100644
--- a/erpnext/accounts/doctype/unreconcile_payment/unreconcile_payment.py
+++ b/erpnext/accounts/doctype/unreconcile_payment/unreconcile_payment.py
@@ -194,7 +194,7 @@ def get_linked_advances(company, docname):
 
 
 @frappe.whitelist()
-def create_unreconcile_doc_for_selection(selections=None):
+def create_unreconcile_doc_for_selection(selections: str | None = None):
 	if selections:
 		selections = json.loads(selections)
 		# assuming each row is a unique voucher
diff --git a/erpnext/accounts/party.py b/erpnext/accounts/party.py
index 9cc7aca9fc1..2a1e3abe8bf 100644
--- a/erpnext/accounts/party.py
+++ b/erpnext/accounts/party.py
@@ -1,6 +1,7 @@
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 # License: GNU General Public License v3. See license.txt
 
+from datetime import date
 
 import frappe
 from frappe import _, msgprint, qb, scrub
@@ -55,22 +56,22 @@ class DuplicatePartyAccountError(frappe.ValidationError):
 
 @frappe.whitelist()
 def get_party_details(
-	party=None,
-	account=None,
-	party_type="Customer",
-	company=None,
-	posting_date=None,
-	bill_date=None,
-	price_list=None,
-	currency=None,
-	doctype=None,
-	ignore_permissions=False,
-	fetch_payment_terms_template=True,
-	party_address=None,
-	company_address=None,
-	shipping_address=None,
-	dispatch_address=None,
-	pos_profile=None,
+	party: str | None = None,
+	account: str | None = None,
+	party_type: str = "Customer",
+	company: str | None = None,
+	posting_date: str | None = None,
+	bill_date: str | None = None,
+	price_list: str | None = None,
+	currency: str | None = None,
+	doctype: str | None = None,
+	ignore_permissions: bool | None = False,
+	fetch_payment_terms_template: bool = True,
+	party_address: str | None = None,
+	company_address: str | None = None,
+	shipping_address: str | None = None,
+	dispatch_address: str | None = None,
+	pos_profile: str | None = None,
 ):
 	if not party:
 		return frappe._dict()
@@ -406,7 +407,9 @@ def set_account_and_due_date(party, account, party_type, company, posting_date,
 
 
 @frappe.whitelist()
-def get_party_account(party_type, party=None, company=None, include_advance=False):
+def get_party_account(
+	party_type: str, party: str | None = None, company: str | None = None, include_advance: bool = False
+):
 	"""Returns the account for the given `party`.
 	Will first search in party (Customer / Supplier) record, if not found,
 	will search in group (Customer Group / Supplier Group),
@@ -491,7 +494,7 @@ def get_party_advance_account(party_type, party, company):
 
 
 @frappe.whitelist()
-def get_party_bank_account(party_type, party):
+def get_party_bank_account(party_type: str, party: str):
 	return frappe.db.get_value("Bank Account", {"party_type": party_type, "party": party, "is_default": 1})
 
 
@@ -609,7 +612,14 @@ def validate_party_accounts(doc):
 
 
 @frappe.whitelist()
-def get_due_date(posting_date, party_type, party, company=None, bill_date=None, template_name=None):
+def get_due_date(
+	posting_date: str | date | None,
+	party_type: str | None,
+	party: str | None,
+	company: str | None = None,
+	bill_date: str | None = None,
+	template_name: str | None = None,
+):
 	"""Get due date from `Payment Terms Template`"""
 	due_date = None
 	if (bill_date or posting_date) and party:
@@ -691,7 +701,9 @@ def validate_due_date_with_template(posting_date, due_date, bill_date, template_
 
 
 @frappe.whitelist()
-def get_address_tax_category(tax_category=None, billing_address=None, shipping_address=None):
+def get_address_tax_category(
+	tax_category: str | None = None, billing_address: str | None = None, shipping_address: str | None = None
+):
 	addr_tax_category_from = frappe.get_single_value(
 		"Accounts Settings", "determine_address_tax_category_from"
 	)
@@ -707,16 +719,16 @@ def get_address_tax_category(tax_category=None, billing_address=None, shipping_a
 
 @frappe.whitelist()
 def set_taxes(
-	party,
-	party_type,
-	posting_date,
-	company,
-	customer_group=None,
-	supplier_group=None,
-	tax_category=None,
-	billing_address=None,
-	shipping_address=None,
-	use_for_shopping_cart=None,
+	party: str,
+	party_type: str,
+	posting_date: str | date | None,
+	company: str | None,
+	customer_group: str | None = None,
+	supplier_group: str | None = None,
+	tax_category: str | None = None,
+	billing_address: str | None = None,
+	shipping_address: str | None = None,
+	use_for_shopping_cart: int | None = None,
 ):
 	from erpnext.accounts.doctype.tax_rule.tax_rule import get_party_details, get_tax_template
 
@@ -756,7 +768,7 @@ def set_taxes(
 
 
 @frappe.whitelist()
-def get_payment_terms_template(party_name, party_type, company=None):
+def get_payment_terms_template(party_name: str, party_type: str, company: str | None = None):
 	if party_type not in ("Customer", "Supplier"):
 		return
 	template = None
diff --git a/erpnext/accounts/report/utils.py b/erpnext/accounts/report/utils.py
index bf604a36db0..58ee9d211a6 100644
--- a/erpnext/accounts/report/utils.py
+++ b/erpnext/accounts/report/utils.py
@@ -147,7 +147,12 @@ def get_appropriate_company(filters):
 
 
 @frappe.whitelist()
-def get_invoiced_item_gross_margin(sales_invoice=None, item_code=None, company=None, with_item_data=False):
+def get_invoiced_item_gross_margin(
+	sales_invoice: str | None = None,
+	item_code: str | None = None,
+	company: str | None = None,
+	with_item_data: bool = False,
+):
 	from erpnext.accounts.report.gross_profit.gross_profit import GrossProfitGenerator
 
 	sales_invoice = sales_invoice or frappe.form_dict.get("sales_invoice")
diff --git a/erpnext/accounts/utils.py b/erpnext/accounts/utils.py
index 75b08c2f28e..6b71228841f 100644
--- a/erpnext/accounts/utils.py
+++ b/erpnext/accounts/utils.py
@@ -3,6 +3,7 @@
 
 
 from collections import defaultdict
+from datetime import date, datetime
 from json import loads
 from typing import TYPE_CHECKING, Optional
 
@@ -60,15 +61,15 @@ OUTSTANDING_DOCTYPES = frozenset(["Sales Invoice", "Purchase Invoice", "Fees"])
 
 @frappe.whitelist()
 def get_fiscal_year(
-	date=None,
-	fiscal_year=None,
-	label="Date",
-	verbose=1,
-	company=None,
-	as_dict=False,
-	boolean=None,
-	raise_on_missing=True,
-	truncate=False,
+	date: str | datetime | None = None,
+	fiscal_year: str | None = None,
+	label: str = "Date",
+	verbose: int = 1,
+	company: str | None = None,
+	as_dict: bool = False,
+	boolean: str | bool | None = None,
+	raise_on_missing: bool = True,
+	truncate: bool = False,
 ):
 	if isinstance(raise_on_missing, str):
 		raise_on_missing = loads(raise_on_missing)
@@ -93,14 +94,14 @@ def get_fiscal_year(
 
 
 def get_fiscal_years(
-	transaction_date=None,
-	fiscal_year=None,
-	label="Date",
-	verbose=1,
-	company=None,
-	as_dict=False,
-	boolean=None,
-	raise_on_missing=True,
+	transaction_date: str | None = None,
+	fiscal_year: str | None = None,
+	label: str = "Date",
+	verbose: int = 1,
+	company: str | None = None,
+	as_dict: bool = False,
+	boolean: str | None = None,
+	raise_on_missing: bool = True,
 ):
 	if transaction_date:
 		transaction_date = getdate(transaction_date)
@@ -171,7 +172,7 @@ def _get_fiscal_years(company=None):
 
 
 @frappe.whitelist()
-def get_fiscal_year_filter_field(company=None):
+def get_fiscal_year_filter_field(company: str | None = None):
 	field = {"fieldtype": "Select", "options": [], "operator": "Between", "query_value": True}
 	fiscal_years = get_fiscal_years(company=company)
 	for fiscal_year in fiscal_years:
@@ -199,18 +200,18 @@ def validate_fiscal_year(date, fiscal_year, company, label="Date", doc=None):
 
 @frappe.whitelist()
 def get_balance_on(
-	account=None,
-	date=None,
-	party_type=None,
-	party=None,
-	company=None,
-	in_account_currency=True,
-	cost_center=None,
-	ignore_account_permission=False,
-	account_type=None,
-	start_date=None,
-	finance_book=None,
-	include_default_fb_balances=False,
+	account: str | None = None,
+	date: str | date | None = None,
+	party_type: str | None = None,
+	party: str | None = None,
+	company: str | None = None,
+	in_account_currency: bool = True,
+	cost_center: str | None = None,
+	ignore_account_permission: bool = False,
+	account_type: str | None = None,
+	start_date: str | None = None,
+	finance_book: str | None = None,
+	include_default_fb_balances: bool = False,
 ):
 	if not account and frappe.form_dict.get("account"):
 		account = frappe.form_dict.get("account")
@@ -437,7 +438,7 @@ def get_count_on(account, fieldname, date):
 
 
 @frappe.whitelist()
-def add_ac(args=None):
+def add_ac(args: frappe._dict | None = None):
 	from frappe.desk.treeview import make_tree_args
 
 	if not args:
@@ -469,7 +470,7 @@ def add_ac(args=None):
 
 
 @frappe.whitelist()
-def add_cc(args=None):
+def add_cc(args: frappe._dict | None = None):
 	from frappe.desk.treeview import make_tree_args
 
 	if not args:
@@ -1154,7 +1155,7 @@ def remove_ref_doc_link_from_pe(
 
 
 @frappe.whitelist()
-def get_company_default(company, fieldname, ignore_validation=False):
+def get_company_default(company: str, fieldname: str, ignore_validation: bool = False):
 	value = frappe.get_cached_value("Company", company, fieldname)
 
 	if not ignore_validation and not value:
@@ -1339,7 +1340,9 @@ def get_companies():
 
 
 @frappe.whitelist()
-def get_children(doctype, parent, company, is_root=False, include_disabled=False):
+def get_children(
+	doctype: str, parent: str, company: str, is_root: bool = False, include_disabled: bool = False
+):
 	if isinstance(include_disabled, str):
 		include_disabled = loads(include_disabled)
 	from erpnext.accounts.report.financial_statements import sort_accounts
@@ -1372,7 +1375,12 @@ def get_children(doctype, parent, company, is_root=False, include_disabled=False
 
 
 @frappe.whitelist()
-def get_account_balances(accounts, company, finance_book=None, include_default_fb_balances=False):
+def get_account_balances(
+	accounts: str | list,
+	company: str,
+	finance_book: str | None = None,
+	include_default_fb_balances: bool = False,
+):
 	if isinstance(accounts, str):
 		accounts = loads(accounts)
 
@@ -1465,7 +1473,9 @@ def create_payment_gateway_account(gateway, payment_channel="Email", company=Non
 
 
 @frappe.whitelist()
-def update_cost_center(docname, cost_center_name, cost_center_number, company, merge):
+def update_cost_center(
+	docname: str, cost_center_name: str, cost_center_number: str, company: str, merge: bool
+):
 	"""
 	Renames the document by adding the number as a prefix to the current name and updates
 	all transaction where it was present.
@@ -1545,7 +1555,7 @@ def parse_naming_series_variable(doc, variable):
 
 
 @frappe.whitelist()
-def get_coa(doctype, parent, is_root=None, chart=None):
+def get_coa(doctype: str, parent: str, is_root: bool | None = None, chart: str | None = None):
 	from erpnext.accounts.doctype.account.chart_of_accounts.chart_of_accounts import (
 		build_tree_from_json,
 	)