I am having the same issue as some of your other users where if I use a discount coupon with taxes, the coupon is not subtracted. If no taxes, the coupon is works fine. After changing the order to apply the coupon after the tax, it works in a confusing way.

Get total showing
and tax is based on that total correctly
then is shows the coupon subtracted at face value,
but with my settings it does correctly subtract the coupon and any tax on that amount. That is correct because you cannot tax on what they did not spend.

So overall the calculations are correct, but it will confuse the customer. Also, I am creating a summary tax report, and that becomes an issue because the tax showing is for the city and state, but the values are on the sub totals before any discounts. So the amounts showing on the report are incorrect since we did not collect say 4% on $45, but rather 4% on $20 because of a $25 coupon.

Has there been any progress on a possible fix? If I could apply the coupon before the tax, the tax would be calculated correctly and stored in the DB correctly and my customers would see the actual tax they were charged correctly.

Please Please Help, our site is live and I want them to be able to use discount coupons.

Zen 1.3.8a
Tax module 2.4

Thanks, and I do love the mod. Good work.