Your new employer should notify us when you start your new job.
You should tell us about any payments you have received from the Department of Employment Affairs and Social Protection (DEASP) during the year. We will ask some other questions to help us work out your tax credits.
You will be able to view your Tax Credit Certificate in PAYE Services ('Manage your tax YEAR>') available in myAccount in two working days. Your new employer will be sent a copy and will use this to calculate your Income Tax and Universal Social Charge.
(Source:Revenue)