You don't. Kitchen staff in most places are paid full hourly wage, and some like executive chefs and sous chefs are on salary. Servers usually make the tipped wage, which is a fraction of full hourly, and they top up their wages with tips.
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Just as in Japan, it is not customary to tip in China. Tipping in China is generally uncommon and can even be considered rude or embarrassing in some circumstances so when taking a taxi, enjoying a refreshing drink or tucking into a delicious meal there's no requirement to leave any gratuities.
Even if the service is poor, it's recommended you leave at least 10 percent. * Check your tab carefully because some places add a gratuity to the bill. You may or may not want to supplement that. For the wait staff at sit-down restaurants, the tip should be 15 percent to 20 percent of the pretax bill.
However, if you're dining at a fancier restaurant like a Michelin-star restaurant or having a tasting menu then a 10% tip is expected. If you're dining at a more casual restaurant like a Trattoria or Osteria, it's not customary to leave a tip after your meal unless you're paying with cash.