Tipping in Singapore
Tipping is generally not expected in Singapore unless you are feeling generous and want to tip an exemplary waiter.
Part of this is due to the 10% service charge that most restaurants impose (you can find it at the bottom of the bill). Some restaurants have chosen to remove the 10% charge, letting customers decide if they would like to leave a tip. So if you think a tip is deserved, go ahead. Note though that hawker centres do not impose such a charge and you are never expected to tip at a hawker centre.
Tipping taxi drivers is also not the norm though tipping the bell boy is acceptable; And NEVER tip anyone representing a government body!