fix: deduct advances adjusted for threshold check for tcs

erpnext/accounts/doctype/tax_withholding_category/tax_withholding_category.py

@@ -327,7 +327,7 @@ def get_tax_amount(party_type, parties, inv, tax_details, posting_date, pan_no=N
 			tax_amount = 0
 		else:
 			#  if no TCS has been charged in FY,
-			# then chargeable value is "prev invoices + advances" value which cross the threshold
+			# then chargeable value is "prev invoices + advances - advance_adjusted" value which cross the threshold
 			tax_amount = get_tcs_amount(parties, inv, tax_details, vouchers, advance_vouchers)
 
 	if cint(tax_details.round_off_tax_amount):
@@ -631,9 +631,12 @@ def get_tcs_amount(parties, inv, tax_details, vouchers, adv_vouchers):
 	)
 
 	cumulative_threshold = tax_details.get("cumulative_threshold", 0)
+	advance_adjusted = get_advance_adjusted_in_invoice(inv)
 
 	current_invoice_total = get_invoice_total_without_tcs(inv, tax_details)
-	total_invoiced_amt = current_invoice_total + invoiced_amt + advance_amt - credit_note_amt
+	total_invoiced_amt = (
+		current_invoice_total + invoiced_amt + advance_amt - credit_note_amt - advance_adjusted
+	)
 
 	if cumulative_threshold and total_invoiced_amt >= cumulative_threshold:
 		chargeable_amt = total_invoiced_amt - cumulative_threshold
@@ -642,6 +645,14 @@ def get_tcs_amount(parties, inv, tax_details, vouchers, adv_vouchers):
 	return tcs_amount
 
 
+def get_advance_adjusted_in_invoice(inv):
+	advances_adjusted = 0
+	for row in inv.get("advances", []):
+		advances_adjusted += row.allocated_amount
+
+	return advances_adjusted
+
+
 def get_invoice_total_without_tcs(inv, tax_details):
 	tcs_tax_row = [d for d in inv.taxes if d.account_head == tax_details.account_head]
 	tcs_tax_row_amount = tcs_tax_row[0].base_tax_amount if tcs_tax_row else 0

erpnext/accounts/doctype/tax_withholding_category/test_tax_withholding_category.py

@@ -210,6 +210,46 @@ def test_tcs_on_unallocated_advance_payments(self):
 			d.reload()
 			d.cancel()
 
+	def test_tcs_on_allocated_advance_payments(self):
+		frappe.db.set_value(
+			"Customer", "Test TCS Customer", "tax_withholding_category", "Cumulative Threshold TCS"
+		)
+
+		vouchers = []
+
+		# create advance payment
+		pe = create_payment_entry(
+			payment_type="Receive", party_type="Customer", party="Test TCS Customer", paid_amount=30000
+		)
+		pe.paid_from = "Debtors - _TC"
+		pe.paid_to = "Cash - _TC"
+		pe.submit()
+		vouchers.append(pe)
+
+		si = create_sales_invoice(customer="Test TCS Customer", rate=50000)
+		advances = si.get_advance_entries()
+		si.append(
+			"advances",
+			{
+				"reference_type": advances[0].reference_type,
+				"reference_name": advances[0].reference_name,
+				"advance_amount": advances[0].amount,
+				"allocated_amount": 30000,
+			},
+		)
+		si.submit()
+		vouchers.append(si)
+
+		# assert tax collection on total invoice ,advance payment adjusted should be excluded.
+		tcs_charged = sum([d.base_tax_amount for d in si.taxes if d.account_head == "TCS - _TC"])
+		# tcs = (inv amt)50000+(adv amt)30000-(adv adj) 30000 - threshold(30000) * rate 10%
+		self.assertEqual(tcs_charged, 2000)
+
+		# cancel invoice and payments to avoid clashing
+		for d in reversed(vouchers):
+			d.reload()
+			d.cancel()
+
 	def test_tds_calculation_on_net_total(self):
 		frappe.db.set_value(
 			"Supplier", "Test TDS Supplier4", "tax_withholding_category", "Cumulative Threshold TDS"