Why do PAYE workers overpay tax?
Common reasons include emergency tax at the start of a job, changing jobs or working for more than one employer, tax credits not being allocated correctly, and credits or reliefs that were never claimed, such as the Rent Tax Credit, health expenses or flat-rate expenses.
How do I check a previous year?
In Revenue’s myAccount, use Review your tax to request a Statement of Liability for a previous year. It compares the tax you paid with the tax you owed and shows whether you are due a refund or have an underpayment.
How is a refund worked out?
Your refund is the Income Tax and USC deducted from your pay, minus your final Income Tax and USC liability after credits and reliefs, minus any refund you already received for that year. A tax credit reduces tax you owe; on its own it is not paid out as cash.
How USC fits in
USC is calculated separately from Income Tax. If your total income for the year is €13,000 or less, you pay no USC. Above that, USC applies across income chargeable to USC. Exempt income, such as qualifying social welfare payments, stays exempt. For 2025 the standard rates are 0.5% on the first €12,012, 2% on the next €15,370, 3% on the next €42,662, 8% on income above €70,044. Reduced rates can apply to some medical-card holders and people aged 70 or over.
How far back can I claim?
You can generally claim a refund for any of the previous four tax years.
A refund claim for 2022 must reach Revenue by 31 December 2026.
A refund claim for 2023 must reach Revenue by 31 December 2027.
A refund claim for 2024 must reach Revenue by 31 December 2028.
A refund claim for 2025 must reach Revenue by 31 December 2029.
What if I have an underpayment?
A review can show that you paid too little tax. Revenue can collect an underpayment, often by reducing your tax credits in a later year. Checking your whole year, not just possible reliefs, avoids surprises.