Tipping is not customary in Singapore. You don’t need to worry about paying tip for using any services in Singapore.
However, there may be times that you want to reward a waiter or bellhop for providing excellent service.
Most restaurants in Singapore add a 10% service charge to the bill so a tip is not expected. If you insist on tipping your waiter, it is best to hand the cash directly to the person as some restaurants take the tips that are left on the table.
Tipping bellhops at hotels is not compulsory but acceptable. SGD1-2 per bag is reasonable.
Taxi drivers do not expect a tip. If you give them extra, they will automatically give back your change.