Merge pull request #45639 from ruthra-kumar/incorrect_tds_on_0_rate_ldc

fix: '0' rate LDC's Invoice net totals should be ignored

erpnext/accounts/doctype/tax_withholding_category/tax_withholding_category.py

@@ -270,7 +270,10 @@ def get_lower_deduction_certificate(company, posting_date, tax_details, pan_no):
 
 def get_tax_amount(party_type, parties, inv, tax_details, posting_date, pan_no=None):
 	vouchers, voucher_wise_amount = get_invoice_vouchers(
-		parties, tax_details, inv.company, party_type=party_type
+		parties,
+		tax_details,
+		inv.company,
+		party_type=party_type,
 	)
 
 	payment_entry_vouchers = get_payment_entry_vouchers(
@@ -360,11 +363,23 @@ def get_invoice_vouchers(parties, tax_details, company, party_type="Supplier"):
 	voucher_wise_amount = []
 	vouchers = []
 
+	ldcs = frappe.db.get_all(
+		"Lower Deduction Certificate",
+		filters={
+			"valid_from": [">=", tax_details.from_date],
+			"valid_upto": ["<=", tax_details.to_date],
+			"company": company,
+			"supplier": ["in", parties],
+		},
+		fields=["supplier", "valid_from", "valid_upto", "rate"],
+	)
+
 	doctype = "Purchase Invoice" if party_type == "Supplier" else "Sales Invoice"
 	field = [
 		"base_tax_withholding_net_total as base_net_total" if party_type == "Supplier" else "base_net_total",
 		"name",
 		"grand_total",
+		"posting_date",
 	]
 
 	filters = {
@@ -383,18 +398,23 @@ def get_invoice_vouchers(parties, tax_details, company, party_type="Supplier"):
 	invoices_details = frappe.get_all(doctype, filters=filters, fields=field)
 
 	for d in invoices_details:
-		vouchers.append(d.name)
-		voucher_wise_amount.append(
-			frappe._dict(
-				{
-					"voucher_name": d.name,
-					"voucher_type": doctype,
-					"taxable_amount": d.base_net_total,
-					"grand_total": d.grand_total,
-				}
-			)
+		d = frappe._dict(
+			{
+				"voucher_name": d.name,
+				"voucher_type": doctype,
+				"taxable_amount": d.base_net_total,
+				"grand_total": d.grand_total,
+				"posting_date": d.posting_date,
+			}
 		)
 
+		if ldc := [x for x in ldcs if d.posting_date >= x.valid_from and d.posting_date <= x.valid_upto]:
+			if ldc[0].supplier in parties and ldc[0].rate == 0:
+				d.update({"taxable_amount": 0})
+
+		vouchers.append(d.voucher_name)
+		voucher_wise_amount.append(d)
+
 	journal_entries_details = frappe.db.sql(
 		"""
 		SELECT j.name, ja.credit - ja.debit AS amount, ja.reference_type

erpnext/accounts/doctype/tax_withholding_category/test_tax_withholding_category.py

@@ -7,7 +7,7 @@ import unittest
 import frappe
 from frappe.custom.doctype.custom_field.custom_field import create_custom_fields
 from frappe.tests import IntegrationTestCase, UnitTestCase
-from frappe.utils import add_days, today
+from frappe.utils import add_days, add_months, today
 
 from erpnext.accounts.doctype.payment_entry.payment_entry import get_payment_entry
 from erpnext.accounts.utils import get_fiscal_year
@@ -676,6 +676,49 @@ class TestTaxWithholdingCategory(IntegrationTestCase):
 		pi2.cancel()
 		pi3.cancel()
 
+	def test_ldc_at_0_rate(self):
+		frappe.db.set_value(
+			"Supplier",
+			"Test LDC Supplier",
+			{
+				"tax_withholding_category": "Test Service Category",
+				"pan": "ABCTY1234D",
+			},
+		)
+
+		fiscal_year = get_fiscal_year(today(), company="_Test Company")
+		valid_from = fiscal_year[1]
+		valid_upto = add_months(valid_from, 1)
+		create_lower_deduction_certificate(
+			supplier="Test LDC Supplier",
+			certificate_no="1AE0423AAJ",
+			tax_withholding_category="Test Service Category",
+			tax_rate=0,
+			limit=50000,
+			valid_from=valid_from,
+			valid_upto=valid_upto,
+		)
+
+		pi1 = create_purchase_invoice(
+			supplier="Test LDC Supplier", rate=35000, posting_date=valid_from, set_posting_time=True
+		)
+		pi1.submit()
+		self.assertEqual(pi1.taxes, [])
+
+		pi2 = create_purchase_invoice(
+			supplier="Test LDC Supplier",
+			rate=35000,
+			posting_date=add_days(valid_upto, 1),
+			set_posting_time=True,
+		)
+		pi2.submit()
+		self.assertEqual(len(pi2.taxes), 1)
+		# pi1 net total shouldn't be included as it lies within LDC at rate of '0'
+		self.assertEqual(pi2.taxes[0].tax_amount, 3500)
+
+		pi1.cancel()
+		pi2.cancel()
+
 	def set_previous_fy_and_tax_category(self):
 		test_company = "_Test Company"
 		category = "Cumulative Threshold TDS"
@@ -833,7 +876,8 @@ def create_purchase_invoice(**args):
 	pi = frappe.get_doc(
 		{
 			"doctype": "Purchase Invoice",
-			"posting_date": today(),
+			"set_posting_time": args.set_posting_time or False,
+			"posting_date": args.posting_date or today(),
 			"apply_tds": 0 if args.do_not_apply_tds else 1,
 			"supplier": args.supplier,
 			"company": "_Test Company",
@@ -1171,7 +1215,9 @@ def create_tax_withholding_category(
 		).insert()
 
 
-def create_lower_deduction_certificate(supplier, tax_withholding_category, tax_rate, certificate_no, limit):
+def create_lower_deduction_certificate(
+	supplier, tax_withholding_category, tax_rate, certificate_no, limit, valid_from=None, valid_upto=None
+):
 	fiscal_year = get_fiscal_year(today(), company="_Test Company")
 	if not frappe.db.exists("Lower Deduction Certificate", certificate_no):
 		frappe.get_doc(
@@ -1182,8 +1228,8 @@ def create_lower_deduction_certificate(supplier, tax_withholding_category, tax_r
 				"certificate_no": certificate_no,
 				"tax_withholding_category": tax_withholding_category,
 				"fiscal_year": fiscal_year[0],
-				"valid_from": fiscal_year[1],
-				"valid_upto": fiscal_year[2],
+				"valid_from": valid_from or fiscal_year[1],
+				"valid_upto": valid_upto or fiscal_year[2],
 				"rate": tax_rate,
 				"certificate_limit": limit,
 			}