TIPPING IS NOT ENCOURAGED, ALTHOUGH IT IS ON THE INCREASE HOWEVER, PERSONAL DISCRETION SHOULD BE USED. A GRATUITY OF 10 PER CENT IS ADEQUATE. TAIPEI HOTELS AND RESTAURANTS ADD 10 PER CENT SERVICE CHARGE AND EXTRA TIPPING IS NOT EXPECTED. IT IS NOT CUSTOMARY TO TIP TAXI-DRIVERS. THE STANDARD TIP FOR PORTERS IS TWD 50 PER PIECE OF LUGGAGE.