Tax availability on the custom payments

Yes that is correct.

Hi,

Glad you found the tax option. :)

Regarding on your question, sorry but tax is not yet available on custom payments. However, we can forward this as a feature request for a consideration. Can you please confirm if this is what you mean here? See the image below.

Thanks!

Yes that is correct.

Alternately it would be far more flexible if you were able to include the paypal field as an output in the logic options for "Insert Text Or Mathematical Calculation into field"

as this would then enable anyone to do a calculation that simply fills that field.  Not sure of the complexity but that would be the ideal solution.

So as an example i'd be looking at doing the following:
My form: http://form.jotformpro.com/form/40960689313965

...would include the calculation as follows:
when invoice total is filled multiply invoice amount by 1.03 (3%) and output to the paypal field "Grand Total = $" 

@cheekyface

A ticket has been opened for your requested feature (tax on custom amount payments). You will be informed when it will be made available, if at all.

As for your other request, I have moved it to this thread.

Thanks!