I only recently returned to Ireland and began wotk a month ago. I received my tax credit cert from revenue and it was on a week 1 basis with a monthly cut off point of €2,450 before I was taxed at 42%. I called them and said I wanted my credits for the 5 months I hadn't worked here, so they sent me a new cert but the monthly cut off point was still €2,450. Payroll said they can only go on what is on the cert. How can I claim my full credits?