I cant give a complete answer, but I’ll try to add my knowledge on to what other people have said.
I’ve done programming that interacts with taxing softwares (so that your order can be taxed correctly based on your location). Zipcode != city and state. Hell even Zipcode+4 with city and state does not give unique tax results. It could depend on if you are in a incorporated or unincorporated area.
edit: And by god I only know some of this because we’ve have people call in to complain about the tax calculations. My favorite was the dude who called in complaining so much it got escalated to me (a programmer). And yes, I did determine his taxes were wrong! They weren’t high enough, so I fixed that for him for that month and every month going forward.
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