Tipping in India is a common practice.
In hotels, porters and room service attendants can be tipped Rs. 50 upwards. For drivers and guides Rs. 300 to 500 per day should suffice generally tipped at the end of the stay. However, the amount of tip varies depending on the type of services rendered.

In restaurants, the tip to waiters is around 10-15 percent of the bill. In cases of restaurants of famous and prestigious hotels, generally a 10 percent service surcharge is added to the bill. However tipping in such places is still the norm.

Tipping taxi and three-wheeler a driver is not too common. It is up to your discretion. However if you want to give tip, then, 10 percent of the fare or leaving the change is enough. At railway stations or airports, pay the porters around Rs. 25-50 per bag. But, make sure to set the rate beforehand. If you stay at somebody's house, ask your host before giving tips to his/her domestic help.