Restaurant servers are the most popular people to tip: 81 percent of respondents said they always tip them, compared to 65 percent who always tip after getting a haircut and 59 percent who always tip after getting food delivered. People tip least frequently at restaurants with no servers: Only 7 percent always tip there, and 45 percent never do. But the report is a very comprehensive analysis of how tipping culture functions in the U.S., covering everything from how Americans feel about tipping to what factors affect their tipping behavior.