I'm currently disagreeing with my payroll company over how they've worked out my tax. They are saying I'm on a cumulative basis which is correct, however whatever way they've worked out my tax I'm actually earning less per month even though I'm getting paid almost 10 euro more per hour than I was.
They are adamant that they are right but I don't know how I can be paid more than other people I know, yet end up with hundreds of euro less per month.
My understanding of the cumulative basis is that they should take my gross salary, then deduct my tax credits for the month, followed by the income levy, PRSI etc, then tax me based on what's left.
However they are taking what I've earned so far this year, adding it together, then doing the same with my tax allowance and as a result my tax this month has jumped from 750 euro to 1650 euro which is completely insane.
Can anyone give some guidance as to how they should be working it out?