Just like any other service-oriented business, tipping is completely at the client’s discretion. Typically, for good service, 15-20% is a standard tip for drivers. However, many vendors include the tip into the contract, so you do not need to hand over any additional cash. If you do not want this fee automatically included, make sure it is not part of your agreement. If the vendor insists on it or says it is standard, you might want to find another vendor. While you are not obligated to tip, it is very common.