Sales tax and Income tax on Sales Invoice - custom calculations

Greetings, hope you are doing well.

We require assistance for manipulating tax calculation as below, we are using ERPNext: v10.1.73

Currently we are discussing Sales Tax for Service Items.

Following two taxes applied on each sales invoice

First Tax:
Sales Tax ----- A = Invoice Amount x 13%
Sales Tax = 13 percent of invoice amount

Second Tax
Income Tax ---- B = (Invoice Amount + 13% of Invoice Amount) x 10%
Income Tax = 10 Percent of (Invoice Amount + Sales Tax)

Case 1
20% of A is withheld by our customer, and submitted to Government dept SRB.
80% of A has to be submitted by our company to the Government dept SRB.
Income tax is withheld by our customer and submitted to Government Dept FBR.

Case 2
100% of A has to be submitted by our company to the Government dept SRB.
Income tax is withheld by our customer and submitted to Government Dept FBR.

Please guide how to implement in ERP NEXT, Thanks.

This forum is your guide - most questions have been asked and answered is some form -

A search such as ‘custom calculations’ will get you started to point the way.

With all the docs, videos, tutorials and posts, what particular details do you need to know that is not clear or presents a problem?

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Refer to here Sales tax and Income tax on sales and purchase invoice