The amount of a tip for a hairdresser for Christmas can vary based on several factors, including the level of service provided, the length of the appointment, the location of the salon, and the relationship between the client and the hairdresser. However, it is generally customary to tip between 15 and 20 percent of the total bill for a standard hair appointment, and a higher percentage may be appropriate for more complex or time-consuming services. In addition, a holiday tip may also be given in addition to a standard tip, typically around 10-20 percent of the total bill.