Re: Not just the US
"It isn't just the US. In the UK, you are not allowed to print prices showing ex-VAT* and ex-Duty or subsidies because that would show how much goverment is screwing consumers"
Appears to be wrong, though I guess you'll just shift the goal posts and claim you meant "final price" or some such.
"On bills and receipts
Sometimes VAT is shown on a separate line. This does not mean you’re paying extra - it just shows how much tax is included in the price.
Invoices from suppliers like builders, painters and decorators must show a separate amount for VAT and their VAT registration number."
From https://www.gov.uk/tax-on-shopping/where-you-see-vat#:~:text=On%20bills%20and%20receipts&text=This%20does%20not%20mean%20you,and%20their%20VAT%20registration%20number.