Tipping is not mandatory in Guwahati, but is appreciated for good service. In restaurants, it is customary to tip about 10% of the bill amount if a service charge is not already included. For hotel staff and cab drivers, small tips are customary, but the amount is a matter of discretion. Note that it can be considered disrespectful to tip in coins, so give bills whenever possible. Overall, tipping is seen as an appreciation of service rather than an obligation.