Tipping is pretty much 100% expected in the US for anything involving "personal" services such as sit-in restaurants, bars, salons, taxis, etc.
Typically, around 15% is acceptable - if you want to go bare minimum, 10% would probably suffice. Any less and it would be considered rude or indicates that you were unhappy with the service.
Typically, around 15% is acceptable - if you want to go bare minimum, 10% would probably suffice. Any less and it would be considered rude or indicates that you were unhappy with the service.