Comment by axiolite

> 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...