I'd almost go so far as to say it's almost universal in the US. The main exceptions: Gasoline (petrol) is always priced with all taxes included. If the estab

I'd almost go so far as to say it's almost universal in the US. The main exceptions: Gasoline (petrol) is always priced with all taxes included. If the establishment is small enough that they're not using a register for cash transactions, they won't add tax. For instance if you buy a hot dog from a food cart for $4, that will be the whole price. But for just about anything bought inside an actual store, tax will be added on.