XML 2.0 - LEDES 2000

SUGGESTED

We have to charge tax and more and more online services are not allowing us to submit with the tax line. I've been told XML 2.0 and Ledes2000 allow it, but I dont know how to set it up. I called support and they said they dont do it. Can anyone help? Its a big pain to have to remove tax, calculate, update, wait till we get paid, clear, and then add tax back. Please help or if anyone else has any work arounds please let me know.