It's a slippery slope of taxes, surcharges and service charges/tipping that restaurants, car rental and condo rentals charge. Cheri's, a restaurant with a long history, charges a 5% tax. Tell the waiter to take it off, it's illegal. They know better but 90% of the patrons don't know. Went to rent a condo, wanted to add 9% tax, told them it's 5% and they said of course, yes you are correct. Ask if the 15% fee is the tip and they say it's a service charge. Car rental "tax" is anywhere from 10 to 16 pct. It's very simple, be diligent when you are about to purchase a service or get a bill and make sure it's correct. If it's not correct, ask to have it changed. If you like your server, tip them in cash an amount you feel appropriate if there is a service charge also.