It can be very convenient for retailers since sales can vary in different counties let alone states:
https://en.wikipedia.org/wiki/Sales_taxes_in_the_United_Stat...
just try to imagine what a mess it would be if any advertisement, price sticker etc. would have to show the full price.
> 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.
Then there’s an incentive to produce higher inequality: high sales tax affects mostly poor, while low property tax usually benefits rich. Poor people are usually underrepresented in democratic institutions, so it would not be surprising if inverse redistribution would be a frequent problem.
Finally, local tax as a way to fund communities is not the only alternative and relying on it would mean that some communities will never get out of financial trouble. Tourist towns are minority, after all. Other countries just keep some of the collected VAT locally and redistribute excesses from richer to poorer communities through federal transfers (German solidarity tax did exactly that, for example).
Convenience isn't even a factor.
Compared to other places, where the price is what you pay (in most cases). You would be adding inconvenience and a little uncertainty to one form of payment. Americans would switch too, if this were the case.
The stores have the info to calculate this, and do at checkout, so it's really the first two points mostly.
So it could 10.25% in one place, 9.75% in the next town 8.750% and 8.975% if you drive for another 15-20 minutes. Imagine if you run a business, have multiple locations and want to buy a TV/Billboard/etc. ad with the price how would that work? You'd also need to make different price stickers, won't be able to print the price on the packaging etc.
Of course this does change the incentives for localities setting their sales tax, and they might be inclined to set them higher if the cost isn't borne by local residents. I don't know if that's a bad thing, if that money improves local services and / or lowers other taxes.