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 35aaf0c84af..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: str, existing_company: str | None = 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)
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 f5485c44d7a..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: str, from_date: str | None = None, to_date: str | None = 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: str, from_date: str | None = None, to_da
 
 
 @frappe.whitelist()
-def get_account_balance(bank_account: str, till_date: str, company: str):
+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(
@@ -140,7 +142,7 @@ def create_journal_entry_bts(
 	bank_transaction_name: str,
 	reference_number: str | None = None,
 	reference_date: str | None = None,
-	posting_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,
@@ -374,10 +376,10 @@ def create_payment_entry_bts(
 @frappe.whitelist()
 def auto_reconcile_vouchers(
 	bank_account: str,
-	from_date: str | None = None,
-	to_date: str | None = None,
-	filter_by_reference_date: str | None = None,
-	from_reference_date: 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,
 ):
 	bank_transactions = get_bank_transactions(bank_account)
@@ -491,10 +493,10 @@ def reconcile_vouchers(bank_transaction_name: str, vouchers: str):
 def get_linked_payments(
 	bank_transaction_name: str,
 	document_types: list[str] | None = None,
-	from_date: str | None = None,
-	to_date: str | None = None,
-	filter_by_reference_date: str | None = None,
-	from_reference_date: 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
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 9342b0e99e9..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
@@ -615,7 +616,7 @@ def calculate_exchange_rate_using_last_gle(company, account, party_type, party):
 @frappe.whitelist()
 def get_account_details(
 	company: str,
-	posting_date: str,
+	posting_date: str | date,
 	account: str,
 	party_type: str | None = None,
 	party: str | None = None,
diff --git a/erpnext/accounts/doctype/journal_entry/journal_entry.py b/erpnext/accounts/doctype/journal_entry/journal_entry.py
index ec537a61ce2..4f6e8b7507e 100644
--- a/erpnext/accounts/doctype/journal_entry/journal_entry.py
+++ b/erpnext/accounts/doctype/journal_entry/journal_entry.py
@@ -1,8 +1,8 @@
 # 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
@@ -1379,7 +1379,7 @@ def get_payment_entry_against_order(
 	dt: str,
 	dn: str,
 	amount: float | None = None,
-	debit_in_account_currency: str | None = None,
+	debit_in_account_currency: str | float | None = None,
 	journal_entry: bool = False,
 	bank_account: str | None = None,
 ):
@@ -1652,9 +1652,9 @@ def get_account_details_and_party_type(
 	account: str,
 	date: str,
 	company: str,
-	debit: str | None = None,
-	credit: str | None = None,
-	exchange_rate: str | None = None,
+	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"):
@@ -1704,7 +1704,7 @@ def get_account_details_and_party_type(
 
 @frappe.whitelist()
 def get_exchange_rate(
-	posting_date: str,
+	posting_date: str | date,
 	account: str | None = None,
 	account_currency: str | None = None,
 	company: str | None = None,
@@ -1712,7 +1712,7 @@ def get_exchange_rate(
 	reference_name: str | None = None,
 	debit: float | str | None = None,
 	credit: float | str | None = None,
-	exchange_rate: str | None = None,
+	exchange_rate: str | float | None = None,
 ):
 	# Ensure exchange_rate is always numeric to avoid calculation errors
 	if isinstance(exchange_rate, str):
diff --git a/erpnext/accounts/doctype/loyalty_program/loyalty_program.py b/erpnext/accounts/doctype/loyalty_program/loyalty_program.py
index 010d5b8017f..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 _
@@ -90,7 +91,7 @@ def get_loyalty_details(
 def get_loyalty_program_details_with_points(
 	customer: str,
 	loyalty_program: str | None = None,
-	expiry_date: str | None = None,
+	expiry_date: str | date | None = None,
 	company: str | None = None,
 	silent: bool = False,
 	include_expired_entry: bool = False,
@@ -121,7 +122,7 @@ def get_loyalty_program_details_with_points(
 def get_loyalty_program_details(
 	customer: str,
 	loyalty_program: str | None = None,
-	expiry_date: str | None = None,
+	expiry_date: str | date | None = None,
 	company: str | None = None,
 	silent: bool = False,
 	include_expired_entry: bool = False,
diff --git a/erpnext/accounts/doctype/payment_entry/payment_entry.py b/erpnext/accounts/doctype/payment_entry/payment_entry.py
index 77164bd7a9f..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
@@ -2698,7 +2699,7 @@ def get_party_details(company: str, party_type: str, party: str, date: str, cost
 
 
 @frappe.whitelist()
-def get_account_details(account: str, date: str, cost_center: str | None = 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
@@ -2854,13 +2855,13 @@ def get_reference_details(
 def get_payment_entry(
 	dt: str,
 	dn: str,
-	party_amount: str | None = None,
+	party_amount: int | float | None = None,
 	bank_account: str | None = None,
-	bank_amount: float | None = None,
+	bank_amount: int | float | None = None,
 	party_type: str | None = None,
 	payment_type: str | None = None,
-	reference_date: str | None = None,
-	created_from_payment_request: 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")
@@ -3526,7 +3527,7 @@ def get_paid_amount(dt, dn, party_type, party, account, due_date):
 
 
 @frappe.whitelist()
-def make_payment_order(source_name: str, target_doc: str | None = 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/pos_invoice/pos_invoice.py b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
index 46628a25576..53c1d75db4e 100644
--- a/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
+++ b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
@@ -898,7 +898,7 @@ class POSInvoice(SalesInvoice):
 
 
 @frappe.whitelist()
-def get_stock_availability(item_code: str, warehouse: str):
+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)
@@ -1084,7 +1084,7 @@ def item_query(
 	searchfield: str,
 	start: int,
 	page_len: int,
-	filters: str | dict,
+	filters: dict,
 	as_dict: bool = False,
 ):
 	if pos_profile := filters.get("pos_profile")[1]:
diff --git a/erpnext/accounts/doctype/pricing_rule/pricing_rule.py b/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
index 59380a12026..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: str | dict, doc: str | None = None):
+def apply_pricing_rule(args: str | dict, doc: str | dict | Document | None = None):
 	"""
 	args = {
 	        "items": [{"doctype": "", "name": "", "item_code": "", "brand": "", "item_group": ""}, ...],
diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
index 60d7a24a33b..2134578efac 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
@@ -1942,7 +1942,7 @@ def make_regional_gl_entries(gl_entries, doc):
 
 
 @frappe.whitelist()
-def make_debit_note(source_name: str, target_doc: Document | None = 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)
diff --git a/erpnext/accounts/doctype/subscription_plan/subscription_plan.py b/erpnext/accounts/doctype/subscription_plan/subscription_plan.py
index 776c82e165e..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
@@ -46,8 +47,8 @@ def get_plan_rate(
 	plan: str,
 	quantity: int = 1,
 	customer: str | None = None,
-	start_date: str | None = None,
-	end_date: str | None = None,
+	start_date: str | date | None = None,
+	end_date: str | date | None = None,
 	prorate_factor: float = 1,
 	party: str | None = None,
 ):
diff --git a/erpnext/accounts/party.py b/erpnext/accounts/party.py
index de16db50850..a6173f432e2 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
@@ -64,7 +65,7 @@ def get_party_details(
 	price_list: str | None = None,
 	currency: str | None = None,
 	doctype: str | None = None,
-	ignore_permissions: bool = False,
+	ignore_permissions: bool | None = False,
 	fetch_payment_terms_template: bool = True,
 	party_address: str | None = None,
 	company_address: str | None = None,
@@ -622,9 +623,9 @@ def validate_party_accounts(doc):
 
 @frappe.whitelist()
 def get_due_date(
-	posting_date: str,
-	party_type: str,
-	party: str,
+	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,
@@ -730,8 +731,8 @@ def get_address_tax_category(
 def set_taxes(
 	party: str,
 	party_type: str,
-	posting_date: str | None,
-	company: str,
+	posting_date: str | date | None,
+	company: str | None,
 	customer_group: str | None = None,
 	supplier_group: str | None = None,
 	tax_category: str | None = None,
diff --git a/erpnext/accounts/utils.py b/erpnext/accounts/utils.py
index d6f031dca70..701f1a40ba5 100644
--- a/erpnext/accounts/utils.py
+++ b/erpnext/accounts/utils.py
@@ -3,7 +3,7 @@
 
 
 from collections import defaultdict
-from datetime import date
+from datetime import date, datetime
 from json import loads
 from typing import TYPE_CHECKING, Optional
 
@@ -61,13 +61,13 @@ OUTSTANDING_DOCTYPES = frozenset(["Sales Invoice", "Purchase Invoice", "Fees"])
 
 @frappe.whitelist()
 def get_fiscal_year(
-	date: str | date | None = None,
+	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 | None = None,
+	boolean: str | bool | None = None,
 	raise_on_missing: bool = True,
 	truncate: bool = False,
 ):
@@ -201,7 +201,7 @@ def validate_fiscal_year(date, fiscal_year, company, label="Date", doc=None):
 @frappe.whitelist()
 def get_balance_on(
 	account: str | None = None,
-	date: str | None = None,
+	date: str | date | None = None,
 	party_type: str | None = None,
 	party: str | None = None,
 	company: str | None = None,