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> That only makes sense for an online store that's going to ship you something, in which case asking for the destination ZIP code up front solves that problem

Tax boundaries do not follow zip code boundaries.

To actually find the right tax rate you need the full address, including suite or apartment number because there are cases where a tax boundary runs between different suites at the same street address.

Also this is not just for online stores that ship something. It also applies if you are selling a downloadable good like a game or music, or selling memberships to your site.



> Tax boundaries do not follow zip code boundaries.

Zip codes represent mail routes, so they're not actually polygons but a set of points (mailboxes), so they don't really even have boundaries.

The Census Bureau has polygons made from those points, but they're not official.




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