Be sure to read your bill before you tip. Many restaurants will automatically add a 15% service charge. If you don’t see it, ask before you tip. Your hotel will add a 10% service charge to the rate. This covers everything from maid service to the dining room to the hotel porter, so there’s no need to leave a room tip. Porters and baggage handlers at the airport expect to receive a dollar per bag, and cab drivers usually receive 15% of the fare.