Ok, I cannot believe that I didn't find this until just now. I hacked one of the New York tax modes, and 1.3.7 broke it. I have not had time to fix it. This mod seems to be the nearly ideal solution.

I installed it (but have not configured it yet) and have but one suggestion. I saw an implementation of zip code tax in a paid solution that I really liked.

The use of a mask on the zip code so that you don't have to enter each and every zip code is an interesting option.

i.e. 895* would be used for all zip codes that start with 895.

I will let you know how the configuration goes later this week.

Thanks for the great work on this. The complete use of the override system witno core overwrites is FANTASTIC!