Well, that's a very good question, but I'm not sure there's a definitive answer. Tipping at Christmas can vary depending on where you live and the customs of your community. However, a good rule of thumb is to consider the type of service you've received and the person who provided it. If you've received excellent service from a retail worker or server, for example, a small cash tip may be appropriate. For those who go above and beyond, such as a caroler or mail carrier, a larger cash gift may be warranted. Ultimately, the amount you choose to tip is up to you.