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It wouldn't be difficult at all. Price stickers are printed/managed in store often enough. Any company that allows you to purchase online already had to deal with differing sales tax, and everything is owned by like one company right now anyway so they already have systems in place to deal with differing tax rules in different states.

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But it's not just states. In California (and I guess many other places) towns in the same country can have different tax rates. Sure price stickers is not an unsolvable issue but advertising prices including tax publicaclly would be almost impossible.

> everything is owned by like one company right now anyway so they already have systems in place to deal with differing tax rules in different states.

Yeah I agree it would generally be a much higher burden for small businesses than for Amazon.

Why is calculating the price with correct tax possible but not the advertising of that price? What is the physical bottleneck?

GP has it wrong. It's entirely physically possible to advertise prices including tax, but it's illegal to do so.

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