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Why charge gross receipts taxes to the customer?
It sounds like "gross receipt tax" is essentially the same thing most states call "sales tax", which is always handled this way -- prices displayed are pre-tax, tax is added when the final price is calculated.  One reason for doing it that way is that most prices result in taxes that involve fractions of pennies, and calculating from the total produces a more accurate result than calculating tax on each item individually. It is theoretically possible to set prices so the numbers come out evenly when tax is added. But that requires that the prices be in fractional cents,  potentially to many decimal places. And in fact in some places it is illegal to display (only) the with-tax price. Otherwise I'm sure some stores and restaurants would be willing to deal with the mils and micros, purely on principle or as a marketing gimmick. Since customers have learned to expect sales tax, it really isn't worth the effort to fight it. The closest I've seen has been occasional "we'll pay your sales tax" offers, or statewide sales-tax holidays once a year.