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.
I did check your form " Paypal Purchase" and did not find any issue with that. It does calculate and display taxes in your form. Please check the screenshot below:
Have you embedded your form in any webpage where you are having this issue? Please share the web page URL and we will take a look.
We will wait for your response.