Tipping in Peru
Most restaurant and bar bills include a 10% gratuity. It's customary to add an extra 10% if the service has been satisfactory. Most Peruvians only tip one or two Soles at small "mom and pop" restaurants that do not add a tip to the bill.
It is true that Peruvians are not big tippers, however, tipping is a great way to show your appreciation to the people serving you and to have your dollars go straight into the pockets of the people that need it most, a 10 to 20% tip will be warmly accepted at any restaurant and will put a surprised smile on a person's face.
Taxis do not expect tips. Fares are negotiated prior to initiating the trip.
Hotel porters and bell boys expect a tip of $ 1 per bag.
Add unusual, use your own judgement and reward good service as you think is appropriate!