I created a 10% coupon for my items. I had the Discount Coupon settings set to the following.

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Discount Coupons

This module is installed
true

Sort Order
280

Include Shipping
false

Include Tax
false

Re-calculate Tax
Standard

Tax Class
Taxable Goods

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When an item is checked out and this coupon is used, the total came out to be:

Item Price: $14.99
Discount Coupon: -$1.50 (correct)
Sales Tax: $1.11 (correct - at 8.25%)
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Total: $14.61 (incorrect!)

If you just grab a calculator and total up the three numbers, it should came out $14.60. Zen-cart is off by 1 cent.

How do I fix this?

I'm using Zen Cart 1.2.6.