What is the standard practice for service charges and tipping?

Service charge is normally around 10% in restaurants and 12% in hotels. The services charges are included in the bill. This is not the same as tipping. Tipping is left to your own discretion at all times and shows your appreciation for hospitality and services. Taxi drivers are usually tipped 10% of the fare, porters 1 ANG per bag, and waiters can be tipped between 5% and 10% of your bill.