Reviewed by: MyTaxRebate Team on 3 Mar 2026 | Authority: s.472 TCA 1997
Quick Answer
Changing jobs in Ireland commonly creates a PAYE overpayment. The most common causes are: emergency tax applied by the new employer before Revenue issues the credit certificate; unused tax credits from a gap in employment between jobs; and incorrect rate allocation during the transition. The Employee Tax Credit (€1,875 under s.472 TCA 1997) and Personal Tax Credit (€1,875) are allocated for the full year - if any months are spent outside employment, those credits are unused and convert into a refund. To avoid emergency tax: register the new employment in the Revenue system before the first payslip. To claim any existing refund: submit a review the tax position through the Revenue system for the year of the job change. MyTaxRebate handles this across all four open years at no upfront cost.
What This Page Covers
- ✓How PAYE tax credits transfer when you change jobs
- ✓How to avoid emergency tax when starting a new job
- ✓How a gap in employment creates an overpayment
- ✓The year-end review: how to claim back overpaid tax from a job change year
- ✓What information you need when leaving and joining an employer
- ✓How far back you can claim for job-change overpayments
Key Facts at a Glance
- ✓Employee Tax Credit: €1,875 /year (s.472 TCA 1997) - unused months after leaving a job generate a refund.
- ✓Personal Tax Credit: €1,875 /year - same; combined with Employee Credit: €3,750/year total.
- ✓Emergency tax: 40% on all income with no credits - avoid by registering new employment in the Revenue system first.
- ✓Gap in employment: credits for non-working months are unused and refundable through a year-end review.
- ✓Register new employer: the Revenue system → Jobs and Pensions → add employer tax registration number.
- ✓Four open years for claims: 2022, 2023, 2024, and 2025.
What Happens to Your Tax Credits When You Change Jobs
Under Ireland's PAYE system, your tax credits and standard rate cut-off are held in Revenue's system and issued to your employer via a tax credit certificate. When you leave a job, your former employer notifies Revenue of the employment cessation through the real-time reporting (RTR) system. Revenue then makes your credit record available for allocation to a new employer. For the new employer to correctly deduct tax from your first payment, they must receive your tax credit certificate before processing payroll. This requires you to register the new employment in the Revenue system - Revenue then issues the certificate to the new employer electronically.
If the new employer does not have the certificate by the time the first payslip is processed, they are legally required to apply emergency tax - deducting at 40% on all income with no credits. This is not an error by the employer; it is the legally mandated approach in the absence of a valid tax credit certificate. The overpayment from emergency tax weeks must be recovered through a the Revenue system review for the year - it is not automatically corrected when the certificate eventually arrives, as the correction applies only from the date the certificate is received.
Step-by-Step: Registering a New Employment in the Revenue system
1. Log into the Revenue system at revenue.ie using your PPS number and MyGovID credentials. 2. Navigate to "Jobs and Pensions" and select "Add a Job or Pension". 3. Enter your new employer's tax registration number (available from your offer letter, HR department, or employment contract). 4. Confirm the employment. Revenue will issue a tax credit certificate to the employer within 1 - 3 working days. If the certificate is received before your first payroll run, your first payment is correctly taxed. Complete this step as early as possible - ideally before your start date.
How a Gap in Employment Generates a Refund
When you leave one job and take time before starting the next - whether for a holiday, a career break, a family commitment, or time to job-search - the months between jobs are months in which no income was earned and no tax was paid. However, Revenue has already allocated the full year's Employee Tax Credit (€1,875 under s.472 TCA 1997) and Personal Tax Credit (€1,875) to your credit record for that year. The credits for the non-working months remain unused and represent a genuine overpayment - you were entitled to those credits but had no income against which they could be applied, resulting in excess tax deducted during the working months.
A year-end review the tax position through the Revenue system for the year of the gap recalculates the correct annual position. Revenue applies the full year's credits against the actual income for the year (only from the working months). Any tax deducted from the working months that exceeds the correct annual liability is refunded. For a worker who left a job in March and did not return to work until November, eight months of unused credits could generate a substantial refund depending on their income level during the working months.
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Claiming Back Emergency Tax and Transition Overpayments
Even where there was no gap between jobs, the transition period often generates an overpayment. If the new employer applied emergency tax for several weeks, or if the standard rate band was temporarily incorrectly allocated between the old and new employers, an overpayment exists for those weeks. To claim it back, submit a review the tax position for the year through the Revenue system. Revenue reconstructs the full year's tax position across all employers and recalculates the correct liability and refund. All four open years (2022 - 2025) can be reviewed simultaneously.
How to Register Your New Job with Revenue Before Day One
The most effective way to avoid emergency tax when changing jobs is to log into the Revenue system before your first payslip at the new employer. Navigate to "Jobs and Pensions" and add the new employment using your new employer's tax registration number (found on your contract or by contacting payroll). Revenue will issue a credit certificate to the new employer within 1 - 3 working days. If this is done before the first payroll run, your new employer deducts the correct amount of PAYE from the first payslip without any emergency tax period.
You should also ensure your previous employer receives an employment cessation record from Revenue when you leave. This replaces the old P45 system and signals to Revenue that the credit allocation for the old employer is no longer needed. Failure to properly close the old employment can result in credits being allocated to both employers simultaneously, which can create a tax liability at year end rather than a refund. Keeping your employment records accurate in the Revenue system avoids both over-deduction at the new employer and under-deduction at both employers.
Claiming Back the Transition Overpayment
If emergency tax was applied for any period during the job change, or if the correct credits were not available to the new employer from the first payslip, the year-end the Revenue system review for that year will recalculate the correct annual liability. The Employee Tax Credit (€1,875 under s.472 TCA 1997) and Personal Tax Credit (€1,875) are applied in the recalculation, as is any applicable flat-rate expense, health expense relief, or rent tax credit for the same year. Revenue processes the review and issues a refund for any overpayment to the registered bank account.
Workers who changed jobs in more than one of the four open years (2022 - 2025) can review all affected years simultaneously in the Revenue system. Each year with a transition overpayment generates its own refund, and the combined recovery across all open years is often the most effective way to reclaim all outstanding amounts. MyTaxRebate reviews all four open years, identifies the transition overpayments in each, and submits a single consolidated claim.
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Tax Scenarios
Employee with missing credits
A PAYE worker finishes the year with standard credits not fully reflected in payroll. The corrected annual calculation reduces liability by €940, creating a refund once the file is reviewed properly.
Worker who changed jobs
An employee changes employer twice in one year and payroll deductions do not align neatly across the record. A full review shows €780 of overpaid tax after the final year-end reconciliation.
Part-year worker with reliefs still unused
A worker has employment income for only part of the year and also has allowable reliefs that were never fully used. The combined review produces a refund of about €1,120 rather than a smaller payslip-only correction.
Common Mistakes To Avoid
- ✗Not registering the new employment in the Revenue system before the first payslip - causes emergency tax at 40% and creates an overpayment that must be recovered later.
- ✗Not reviewing the year of the job change - the transition period is one of the most likely sources of PAYE overpayment.
- ✗Assuming the overpayment was corrected when the credit certificate arrived - the correction applies from the date of receipt only; prior weeks on emergency tax must still be recovered through the Revenue system.
- ✗Not reviewing gaps in employment - months spent without income generate unused credits that are refundable but not automatically paid out.
When This Does Not Apply
Key Takeaways
- Register new employment in the Revenue system before the first payslip to avoid emergency tax at 40%.
- The Employee Tax Credit (€1,875, s.472 TCA 1997) and Personal Tax Credit (€1,875) for months between jobs are unused and generate a refund.
- The year you change jobs is frequently the year with the largest PAYE overpayment - submit a review the tax position for that year.
- MyTaxRebate reviews all four open years including job-change years and identifies all transition overpayments at no upfront cost.
Check Your Claim
MyTaxRebate can review your position and guide the next step.
Frequently Asked Questions
What happens to my tax when I change jobs?
Your tax credits transfer to the new employer when Revenue issues them a credit certificate. To trigger this, register the new employment in the Revenue system under Jobs and Pensions before your first payslip. Without this step, emergency tax at 40% applies.
How do I avoid emergency tax when starting a new job?
Log into the Revenue system → Jobs and Pensions → Add a Job. Enter the new employer's tax registration number. Revenue issues a credit certificate within 1 - 3 days. If received before payroll, emergency tax is avoided entirely.
Can I claim a refund for the year I changed jobs?
Yes. The year of a job change is frequently the year with the largest PAYE overpayment - from emergency tax, gaps, or transition period issues. Submit a review the tax position through the Revenue system for that year.
Does emergency tax fix itself when my employer gets my credit certificate?
The certificate corrects tax deductions from the date it is received - it does not retroactively refund emergency tax from prior weeks. The emergency tax overpayment from before the certificate arrived must be claimed through a the Revenue system year-end review.
How long does a job-change refund take?
Revenue typically processes the review and issues the refund within 5 - 15 working days of submitting through the Revenue system, paid electronically to the registered bank account.
How far back can I claim for a job I changed years ago?
Four years. In 2025 you can claim for 2022, 2023, 2024, and 2025. Any job-change-related overpayment in those years can be reviewed through the Revenue system.
