Dynamic GST Calculation for Credit Card Surcharge

This update introduces the enhancement of GST calculation logic for the Credit Card Surcharge in invoices to dynamically depend on the GST applied to the invoice item lines.

Location: Students > Financial > Invoice

• On the Invoice Report, the updated logic is applied so that the GST Charged on the Credit Card Surcharge reflects the GST proportions of the invoice item lines.

• Whenever all invoice item lines have 0% GST, the Credit Card Surcharge also have 0% GST

• Whenever some invoice lines are GST Charged and the rest are not, the calculation of GST for the Credit Card Surcharge would be based on the ratio to the percentage of GST overall on the main item lines.
  
  Ex.

Line A – 1000 (90.91 GST)

Line B – 100 (No GST)

Line C – 50 (No GST)
Line D - 115 (Credit Card Surcharge Amount)

(1000 – 90.91) + 100 + 50 = 1059.09 **Since GST is 90.91 dollars**

Therefore, GST on Credit Card Surcharge would be:

90.91 / 1059.09 = 0.0858

Now the Credit Card Surcharge Amount is 115 so:

0.0858 * 115 = 9.87

Then we’ll get the GST amount for the Credit Card Surcharge that is 9.87 dollars

Note: This for eWay Payment Gateway.