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