What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
It is possible to add tax amount in your payment form. I am not sure how you want to deduct the tax amount. Do you want to deduct it based on the location of users?
You can add the tax amount to your products and you can also enable location based tax surcharges as well. Please check the screenshot below on how to add tax component in your payment form:
Hope this helps.
Do get back to us if you have any questions.