Change the tax rates and tax names to suit the example given by @rafat
wiki changed to Pakistan example wrote:
Using Tax on already added Tax (Pakistan)
Certain regions in Pakistan have a Provisional Tax of 19.5% and a Advance Income Tax of 12.5% on already taxed items. Here is how you can handle that.
First create 2 Tax Types:
Provisional Tax 19.5%, rate 19.5 Remember to include the 19.5% in the name.
Advance Income Tax 12.5%, rate 14.9375(12.5 * 1.195). Remember to include the 12.5% in the name. You will need to increase the percent decimals in preferences. The value 1.195 is the value of Provisional Tax + 1. If the Provisional Tax was 6% this value would be 1.06.
Combine these two Tax Types into a Tax Group.
Find the variable, $suppress_tax_rates, in config.php about line 193. Change the value to 1. This will suppress the internal tax rate when printing.
The last sentence is no longer valid in current FA version; you now suppress tax rates in Setup->Company setup-> Suppress Tax Rates on Docs: checkbox
Read the wiki on tax groups.
Try it out on your training company first
The FrontAccounting Wiki(Manual, examples, tips, setup info, links to accounting sites, etc) https://frontaccounting.com/fawiki/