The Republic of Ireland uses the euro (€). Northern Ireland uses the pound sterling (£), although the euro is also accepted in many places.
Hotels €1/£1 per bag is standard; tip cleaning staff at your discretion.
Pubs Not expected unless table service is provided, then €1/£1 for a round of drinks.
Restaurants For decent service 10%; up to 15% in more expensive places.
Taxis Tip 10% or round up fare to nearest euro/pound.
Toilet attendants Loose change; no more than €0.50/50p.