Tipping is kept to a minimum in Norway, and service charges are added to most bills. It is, however, handy to have a supply of NKr 10 or NKr 20 coins for less formal service. Tip only in local currency. Room service usually includes a service charge in the bill, so tipping is discretionary. Round up a taxi fare to the next round digit, or tip anywhere from NKr 10 to NKr 20, a little more if the driver has been helpful. All restaurants include a service charge, ranging from 12% to 15%, in the bill. It's customary, but not obligatory, to add a little tip or to round up. Note that if you're paying via credit card, the waiter will usually bring around a mobile card terminal, and you can type in the bill's total, including any tip.