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Just show the price including tax. (half-sarcastic, because obviously that would be an unpopular change for sellers because it makes the visible number go up, but it would solve two problmes...)

They could still set the post-tax price to something that results in round numbers, at downside of the pre-tax price having more decimals.

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> Just show the price including tax.

With a tax rate as precise as 1000ths of a percent in many jurisdictions*, you'd need extreme precision on the price tag (e.g. $11.798625), OR you need to substantially overcharge for tax (rounding up the tax to the penny or nickel on each individual item, instead of on the total of ALL items).

And sales tax rates can even be different from ONE CITY BLOCK TO THE NEXT.

* Arizona: 10.725% Hawaii: 4.712% Minnesota: 7.875% etc. https://en.wikipedia.org/wiki/Sales_taxes_in_the_United_Stat...

No, you still round the number, that goes on the price tag and adjust the other.

Since that is a state thing, it can never happen and is likely outside the power of Congress to enforce, especially with our current activist federal supreme court.

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