Registering for tax
What is a Tax Registration Number?
A Tax Registration Number (TRN) is issued by Revenue when you register for tax as a sole trader, trust, partnership or company.
You must use your TRN when trading and filing your tax returns as a sole trader, trust, partnership or company.
As a sole trader your TRN will be the same as your Personal Public Service Number (PPSN). Your PPSN does not become your TRN until you have been registered with Revenue as a sole trader.