Topic: Create a new calculate field in profit and loss report


How can I create a calculated field in profit and loss report like "Calculated Return". I need to show my owner the estimated revenue tax that we will pay. I know that is it different for each country or company. So if you can help I have some kind of knowledge in programming so I can make it for my personal use, but I need that you help me what can I change without damage the system core.

Thanks for your time.

You're a rock star

Freddy Norori