Tipping is common in many industries in Germany. The rule of thumb is that five to ten percent of the invoice amount in a restaurant is common.
Etiquette expert recommends thinking more about the choice of service and ordering a simple coffee instead of the expensive coffee mix drink in a café. Some employees are virtually dependent on the additional income, especially in large cities, where a large part of the wage is spent on rent alone. The more satisfied you are with the service you receive, the more likely you are to reward the company or the respective employee.