Quote Originally Posted by lhungil View Post
If "tax" is not being calculated correctly when a customer goes through the "checkout" process, something is probably not quite "right" with your tax configuration... I'd start by searching other threads on the forums about setting up taxes and/or vat... Or creating a new thread to ask why your "tax" is not being correctly applied during the "checkout" process.

You need to fix all issues with "taxes" during the "checkout" process before you will be able to tackle any issues with "tax" calculation when editing an order.
Thanks for the help.
The taxes work fine 100% of the time. The only time they messs up is when a discount coupon comes into the equation