Coupon Subtracting wrong

[n8pbm]

I have a coupon that gives 10% off any order (excluding shipping). It works fine except when sales tax is applied. Here is an example:

Currently:

Product: $80.50
Discount: -$8.53
Tax 6%: $4.35
Shipping: $8.05
Total $84.37

The discount should be $8.05 ($80.50 * .1 = $8.05) but instead it takes the total, applies tax to it and then gives the discount. ($80.50 * 1.06 = $85.33) (85.33 * .1 = $8.53).

Then it takes the sales tax from the discount and gets the amount shown in the sales tax ($4.35).

So the customer gets a bigger discount because it includes the sales tax. The correct numbers should be:

Product: $80.50
Discount: -$8.05
Tax 6%: $4.35
Shipping: $8.05
Total $84.85

Anyone have any ideas how to fix this?

Thanks

[Kim]

Check your settings and make sure you do not have the coupon set to discount the sales tax.

[DrByte]

These settings would be in the Admin->MOdules->Order Totals .... ot_coupon