[Your Nightmare]

By law, the sales receipt would have 23% printed on it.

Um... no. Per the law, the tax must be separately charged and stated, but the law does not say that the rate (in either inclusive or exclusive form) has to be there.

hmm...

`SEC. 510. TAX TO BE SEPARATELY STATED AND CHARGED.

`(a) In General- For each purchase of taxable property or services for which a tax is imposed by section 101, the seller shall charge the tax imposed by section 101 separately from the purchase. For purchase of taxable property or services for which a tax is imposed by section 101, the seller shall provide to the purchaser a receipt for each transaction that includes--

`(1) the property or services price exclusive of tax;

`(2) the amount of tax paid;

`(3) the property or service price inclusive of tax;

`(4) the tax rate (the amount of tax paid (per paragraph (2)) divided by the property or service price inclusive of tax (per paragraph (3));

`(5) the date that the good or service was sold;

`(6) the name of the vendor; and

`(7) the vendor registration number.

[kevkrom]

(4) the tax rate (the amount of tax paid (per paragraph (2)) divided by the property or service price inclusive of tax (per paragraph (3));

Touche -- that's what I get for going from memory.