‘Tis the season for tipping.

Tipping is tough enough on a regular day. But the holidays make it especially confusing. “American tipping has become its own strange monster,” says Lizzie Post, co-host of the Awesome Etiquette podcast. Her advice: “Start with your budget and think about the people who made the biggest difference in your life.” Click through the gallery to see whom to tip — and whom to skip — this holiday season.