diff --git a/app/models/sale.rb b/app/models/sale.rb
index 56f52b74..9f4ae9f7 100644
--- a/app/models/sale.rb
+++ b/app/models/sale.rb
@@ -287,7 +287,9 @@ class Sale < ApplicationRecord
           total_tax = total_taxable - total_discount
           #include or execulive
           if tax.inclusive
-            sale_tax.tax_payable_amount = total_tax / 21
+            rate = tax.rate
+            divided_value = (100 + rate)/rate
+            sale_tax.tax_payable_amount = total_tax / divided_value
           else        
             sale_tax.tax_payable_amount = total_tax  * tax.rate / 100
             total_tax_amount = total_tax_amount + sale_tax.tax_payable_amount
@@ -330,7 +332,9 @@ class Sale < ApplicationRecord
           total_tax = total_taxable - self.total_discount
           #include or execulive
           if tax.inclusive
-            sale_tax.tax_payable_amount = total_tax / 21
+            rate = tax.rate
+            divided_value = (100 + rate)/rate
+            sale_tax.tax_payable_amount = total_tax / divided_value
           else        
             sale_tax.tax_payable_amount = total_tax  * tax.rate / 100
             total_tax_amount = total_tax_amount + sale_tax.tax_payable_amount