You're never obligated to tip someone when they've provided you poor service or if you've had a rude interaction with them.
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At table-service restaurants, the tipping etiquette and procedure vary slightly from country to country. But in general, European servers are well paid, and tips are considered a small bonus — to reward great service or for simplicity in rounding the total bill to a convenient number.
Restaurant tips are more modest in Europe than in America. At restaurants, check the menu to see if service is included; if it isn't, a tip of 5–10 percent is normal. In most places, 10 percent is a big tip. If your bucks talk at home, muzzle them on your travels.
I find that attractive servers earn approximately $1261 more per year in tips than unattractive servers, a result that is both statistically and economically significant. The main driver of this beauty earnings gap appears to be female customers tipping attractive female servers more than unattractive female servers.
The average tip is around 10-15% of the cheque. Tipping is not obligatory, you can tip whoever you want to show that the service was good. Don't forget to tip tour guides and drivers too, but only if you are happy with the service they have provided.
Tipping in Prague is not as common as it is in other European cities, so you don't need to feel obligated to tip everywhere. Generally speaking, restaurants will include a surcharge of 8-10% on the bill, but if this isn't the case, 10-15% is the standard.