
What is rule regarding tipping in Washington DC
The rule of the thumb is 15 - 20% of the total bill while tipping a waiter at a restaurant in Washington DC. It is appropriate to tip even more if the service is very good.
Not just the waiters, everyone expects a tip as they work on minimum wages. Hotel-room attendants should get $1 per guest per day. Tip taxi drivers about 10% of your fare. Airport baggage handlers get about $1 per bag. Hairdressers usually get 20% tips too, and the coat-check staff should be given $1.
http://www.fodors.com/world/north-america/usa/district-of-columbia/washington-dc/travel-tip_2046945.html

