Reviewed by: MyTaxRebate Team on 10 Mar 2026 | Authority: s.472 TCA 1997
Quick Answer
PAYE workers in Ireland commonly overpay income tax without any visible indication on their payslip. Under s.112 TCA 1997, employment income is taxed at source through the PAYE system - but the system applies the rate and credits you have on record with Revenue, which may not reflect your actual entitlement. The most reliable signs of overpayment are: emergency tax appearing on a payslip, a job change during the year without a credit transfer, working multiple jobs, or having unclaimed reliefs from medical expenses, working from home, or flat-rate entitlements. The Employee Tax Credit (s.472 TCA 1997) is worth €1,875 in 2025 - if it was not correctly allocated to you in any year since 2022, you are owed that difference as a refund. MyTaxRebate identifies overpayments across all four claimable years and submits the recovery claim directly to Revenue.
What This Page Covers
- ✓How to read your payslip for signs of overpayment
- ✓What emergency tax looks like and when it occurs
- ✓How to identify overpayment from multiple employers
- ✓What unclaimed reliefs cost you each year
- ✓How MyTaxRebate confirms and recovers overpayments
Key Facts at a Glance
- ✓Revenue applies tax at the rate and credits on file - errors in those records cause overpayments that persist until corrected or claimed.
- ✓Emergency tax rate is 40% flat on all income - the overpayment from weeks on emergency tax must be actively claimed.
- ✓The standard rate of income tax in 2025 is 20% on the first €42,000 of income - income taxed at 40% that should have been at 20% generates a 20% overpayment.
- ✓Unclaimed medical expenses at 20% relief, WFH days at €3.20 per day, and flat-rate occupational expenses all represent uncaptured refund entitlements.
- ✓Claims can be backdated for 2022, 2023, 2024, and 2025 - 2022 closes on 31 December 2026.
- ✓MyTaxRebate accesses your Revenue records directly to identify every year where overpayment occurred.
- ✓Backdate up to four tax years - in 2025, PAYE refunds are claimable for 2022, 2023, 2024, and 2025.
Reading Your Payslip for Signs of Overpayment
Your payslip shows the tax deducted each pay period, but it does not tell you whether that deduction was correct. The figure on your payslip is what your employer calculated based on the tax credit certificate Revenue issued - if that certificate was wrong, or if you had additional reliefs that were not claimed, the deduction was too high.
What to look for: If your payslip shows an emergency tax code (typically "Week 1 Basis" or "Month 1 Basis" next to your tax figure), or if the PAYE deduction appears disproportionately high relative to your gross pay, this is a strong indicator of overpayment. A rough check: multiply your gross annual salary by 20% and subtract €3,750 (your standard combined credits). If the tax deducted from your payslips totals significantly more than this, an overpayment has likely occurred.
Emergency Tax - The Most Common Cause
Emergency tax applies at a flat 40% when Revenue does not have your tax credit certificate details at the start of employment. Even after your employer receives your credit certificate and corrects the rate going forward, the overpaid tax from the emergency-tax weeks does not automatically refund. You must claim it separately, and it is recoverable for up to four years. Many workers who changed jobs in 2022, 2023, or 2024 are still sitting on unclaimed emergency tax overpayments.
Check Your Claim
MyTaxRebate can review your position and guide the next step.
The Legislative Basis for PAYE Overpayments
Under s.112 TCA 1997, all employment income is assessed as Schedule E income and taxed through the PAYE system. Revenue calculates your tax liability for each year based on your total income, less any tax credits (including the Employee Tax Credit under s.472 TCA 1997, worth €1,875 in 2025) and reliefs. When the total tax deducted from your payslips during the year exceeds this calculated liability, the difference is an overpayment. Revenue does not automatically return overpayments - you must claim them within the four-year window.
Reading Your Statement of Liability
Revenue's Statement of Liability (formerly the P21 Balancing Statement) is the definitive document confirming whether you have overpaid or underpaid tax for a given year. It lists your total income, deductions, credits applied, and the resulting tax liability. If the liability is lower than what was deducted, the difference is your refund. You can view statements of liability through Revenue's your Revenue record system for recent years, or MyTaxRebate can access and review them directly on your behalf across all four claimable years. Where additional reliefs are added to the claim, the statement of liability is recalculated to reflect the updated position.
What the Revenue Review Process Involves
When MyTaxRebate submits a backdated refund claim, Revenue reviews the submitted information against its own payroll records (held via PAYE Modernisation data from your employers) and any relief declarations included in the claim. For most straightforward claims, Revenue processes the refund within two to four weeks. For claims including medical expenses, working-from-home relief, or flat-rate expenses, Revenue may request receipts or supporting records before finalising the calculation. MyTaxRebate prepares all supporting documentation required and responds to Revenue information requests on your behalf throughout the process.
Acting Before the 2022 Window Closes
For PAYE workers who have not reviewed their tax position since 2022, time matters. Revenue's four-year window means the 2022 tax year closes permanently on 31 December 2026. Any overpayment from 2022 - whether from emergency tax, a multiple-employer issue, or unclaimed reliefs - must be claimed before that date or it is permanently lost. A four-year review covering 2022 to 2025 ensures every available entitlement is captured before any window closes. MyTaxRebate completes the review and submits all applicable years in a single consolidated claim, maximising the total refund recovered.
MyTaxRebate provides a clear answer on your overpayment position before submitting anything to Revenue. You know your estimated refund amount before the claim process begins, with no obligation and no cost unless a refund is recovered.
MyTaxRebate provides a clear answer on your overpayment position before submitting anything to Revenue. You know your estimated refund amount before the claim process begins, with no obligation and no cost unless a refund is recovered.
Check Your Claim
MyTaxRebate can review your position and guide the next step.
Tax Scenarios
Invisible emergency tax overpayment
A hospitality worker started a new role in May 2023 and was on emergency tax for nine weeks. His subsequent payslips showed the standard rate after his credits were applied - but the nine weeks of 40% deductions were never corrected. MyTaxRebate identified the overpayment of €1,120 and submitted the recovery claim for 2023. Revenue issued the refund within three weeks.
Medical expenses - four unclaimed years
A teacher had been incurring an average of €900 per year in out-of-pocket medical costs since 2022 but had never claimed the 20% relief. The unclaimed relief across four years totalled €3,600 in qualifying expenses, producing a refund of €720 (€180 per year). Not visible on any payslip - only identifiable by reviewing what was not claimed.
Rate band not split between two employers
A construction worker held a main job and did weekend work with a second employer in 2024. Revenue had not split his standard rate band between both employers, so all income from the second employer was taxed at 40%. His actual liability at 20% on that income generated a refund of €890 for 2024 once MyTaxRebate submitted the corrected calculation. All three scenarios illustrate situations that Revenue's real-time payroll system would not have automatically corrected - each required an active backdated claim to recover the overpaid tax.
Common Mistakes To Avoid
- ✗Assuming your employer corrected all overpayments: Employers correct rates going forward when credits are applied, but they cannot refund past overpayments - that must come from Revenue via a claim.
- ✗Treating emergency tax as a one-time event: Emergency tax from early weeks with a new employer is an unresolved overpayment until you claim it.
- ✗Not keeping medical receipts: For current-year medical expenses, Revenue may request proof - request annual prescription statements from pharmacies rather than trying to accumulate individual receipts.
- ✗Waiting until year-end to check prior years: Prior years can be reviewed at any time - there is no need to wait until December to check 2022 or 2023.
When This Does Not Apply
Key Takeaways
- ➤ Overpayments do not appear as errors on your payslip - active review is the only way to identify them.
- ➤ Emergency tax, job changes, and multiple employers are the most common structural causes of overpayment.
- ➤ Unclaimed reliefs (medical, WFH, flat-rate) represent money you were entitled to but did not receive.
- ➤ All four years (2022 - 2025) should be reviewed together for maximum recovery.
- ➤ MyTaxRebate confirms your overpayment before submitting any claim to Revenue.
Check Your Claim
MyTaxRebate can review your position and guide the next step.
Frequently Asked Questions
Will my payslip show if I have overpaid?
Not directly. Your payslip shows the tax deducted, but it does not indicate whether that deduction was correct relative to your actual liability. Overpayments from emergency tax, incorrect credit allocation, or unclaimed reliefs are not flagged as errors. The only way to confirm an overpayment is to review your actual tax liability against what was deducted, which is what MyTaxRebate does on your behalf.
How long after overpaying can I claim a refund?
Revenue allows PAYE workers to claim for up to four years from the end of the relevant tax year. In 2025, that means overpayments from 2022, 2023, 2024, and 2025 are all claimable. Overpayments from 2021 and earlier cannot be recovered. The 2022 window closes permanently on 31 December 2026.
Does Revenue automatically refund overpaid tax?
Revenue's PAYE Modernisation system (operational since 2019) processes payroll in near real-time and is designed to reduce overpayments, but it does not automatically issue refunds for prior-year overpayments or for reliefs that were not claimed. PAYE workers must submit claims for backdated refunds, and MyTaxRebate submits these claims on their behalf.
Is it possible I underpaid tax instead of overpaying?
Yes. If you received a benefit-in-kind that was not correctly taxed, had untaxed income from a second source, or had credits applied that you were not entitled to, you may have an underpayment. Revenue's year-end balancing review can result in a liability rather than a refund. MyTaxRebate reviews your full tax position before submitting anything - if a liability is identified, we advise you before proceeding.
What documents do I need to prove an overpayment?
For the structural elements of an overpayment (emergency tax, incorrect rate band), Revenue's own payroll records are the primary evidence - no separate documents are required. For additional reliefs such as medical expenses, Revenue may request receipts or annual statements from healthcare providers. MyTaxRebate advises on what documentation is needed for your specific claim and manages the submission process end to end.
