diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 1a7ffc3c339b..dc2b44e7527a 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -1002,9 +1002,9 @@ def validate_proj_cust(self):
 	def validate_pos(self):
 		if self.is_return:
 			invoice_total = self.rounded_total or self.grand_total
-			if flt(self.paid_amount) + flt(self.write_off_amount) - flt(invoice_total) > 1.0 / (
-				10.0 ** (self.precision("grand_total") + 1.0)
-			):
+			if abs(flt(self.paid_amount)) + abs(flt(self.write_off_amount)) - abs(
+				flt(invoice_total)
+			) > 1.0 / (10.0 ** (self.precision("grand_total") + 1.0)):
 				frappe.throw(_("Paid amount + Write Off Amount can not be greater than Grand Total"))
 
 	def validate_warehouse(self):