Tipping
In Ireland a customary service charge of 10 to 15% may be added to your check. If a service charge is included tipping is not necessary, unless you received exemplary service. If a service charge was not included, a tip of 10% to 15% would be appropriate depending, on the quality of the establishment and the service. If you are not sure if a service charge was included in your check, don't be afraid to ask.
It is not necessary to tip bartenders, but if you receive waiter or waitress services it would be appropriate to tip.
Porters should receive about 50 pence per bag and cab drivers 10% of the fair.