What is the Gaelic for 'Thank you'?

Scottish Gaelic:

"Tapadh leat" (pronounced "tappa let") - if you are speaking to one person/being informal)

"Tapadh leibh" pronounced "tappa lave" - if you are speaking to more than 1 person or want to be polite

Irish Gaelic:

Irish does not have the informal/formal distinction as in Scottish Gaelic.

"Go raibh maith agat" (gurra mah aggut) - singular

"Go raibh maith agaibh" (gurra mah oggiv) - plural