If you have missed the tax return deadline in Ireland, take a breath. The penalty is a percentage of the tax due, it steps up at a fixed point and it is capped, so acting this week really does cost less than acting next month. If you are reading this on 30 October and you file and pay through ROS, you still have until 18 November 2026. If the date has gone, here is what happens and what to do first.
Key takeaways
- ROS filers who both file and pay through ROS have until Wednesday 18 November 2026 for the 2025 Form 11. Otherwise the date is 31 October 2026.
- Filing less than two months late costs a 5% surcharge on the tax due, capped at €12,695.
- Filing more than two months late costs 10%, capped at €63,485.
- Interest on unpaid tax runs at 0.0219% a day, which is about 8% a year.
- If no tax is due, the surcharge has nothing to apply to, but you should still file.
What happens if you have missed the tax return deadline in Ireland?
You pay a surcharge on the tax due: 5%, capped at €12,695, if you are less than two months late, and 10%, capped at €63,485, if later. Interest on any unpaid tax also runs at 0.0219% a day. If you owe no tax, there is no tax for the surcharge to apply to.
Here is how that looks on an example tax bill of €8,000 for the year:
| When the return is filed | Surcharge rate | Surcharge on €8,000 |
|---|---|---|
| Up to about two months after your due date | 5% | €400 |
| More than two months after your due date | 10% | €800 |
If your due date is 18 November 2026, the 5% band runs to around mid-January 2027. After that the 10% rate applies. According to Revenue’s Pay and File guidance, a 10% surcharge can also apply if your Local Property Tax obligations are not met, even when your income tax return is on time.
What is the deadline for the 2025 tax return?
The Pay and File deadline for your 2025 Form 11 is 31 October 2026. If you file and pay through ROS, it is extended to Wednesday 18 November 2026. Preliminary tax for 2026 is due on the same date. The extension only applies if you do both through ROS.
Our post on the self-assessment tax return deadline in Ireland sets out every date in one place. This post picks up where that one stops: what happens after the date has gone. Whatever your date is, the income tax deadline in Ireland is the same one for a Dublin contractor, a Galway shop owner or a Mayo farmer. The rules are national.
How much interest will Revenue charge on late tax?
Revenue charges interest on late or underpaid tax at 0.0219% a day. You work it out as the unpaid tax, multiplied by the number of days late, multiplied by 0.000219. It runs until the tax is paid, so paying what you know you owe stops it growing even if the return is not finished.
Some examples:
- €2,000 paid 60 days late: interest of about €26.28.
- €10,000 paid 90 days late: interest of about €197.10.
- €25,000 paid 30 days late: interest of about €164.25.
Interest is separate from the surcharge. You can owe both, which is why the first job is to stop the clock on the payment side.
What should you do first if you have missed it?
File the return on ROS as soon as you can and pay what you know you owe. Filing stops the surcharge moving from 5% to 10%, and paying stops interest building. If you cannot pay in full, ask Revenue about a phased payment arrangement. Here is the order we would work in:
- File the return on ROS as soon as you can. Every day after the due date adds to the interest, and getting inside the two-month window keeps the surcharge at 5% rather than 10%.
- Pay the tax you know you owe now, even if the return is not finished. Payment is what stops interest running.
- If you cannot pay in full, contact Revenue and ask about a phased payment arrangement before the debt grows.
- If more than one year is outstanding, say so straight away so the years can be dealt with together, starting with the oldest.
- Keep your records tidy while you do it: bank statements, invoices and receipts for the year in question.
If you have never filed a return before, our guide to how to file a self-assessment return online walks through the steps. Many people in this position do not need new information, they just need someone to sit down with the numbers for an hour. A late income tax return is usually quicker to prepare than people expect. Having a tax return done by someone who files them every week takes the guesswork out of it.
Can Revenue do more than charge a surcharge?
Yes, if returns stay outstanding. Revenue can raise an estimated assessment, and an outstanding return can hold up things such as a tax clearance certificate. Filing late costs a capped surcharge, whereas leaving it open can cost far more, so it is almost always better to file even if you are late.
A Dublin sole trader tendering for work often needs tax clearance, and a landlord with a rental return outstanding may find the same problem. The good news is that a late return is one of the more common problems we see, and it is not the end of the world. A short chat with a tax advisor in Dublin is usually enough to map out the order of play.
Getting help with a late tax return in Dublin, Galway and across Ireland
Fuchsia Bell is a firm of chartered accountants in Castlemaine, Co. Kerry, run by Gero O’Connor, working with clients all over Ireland online. We help self-employed people, landlords and directors in Dublin to catch up on late returns. If you are in the west, a chartered accountant in Galway can pick up your file just as easily, and we also work with clients in Mayo and right across Ireland.
Frequently Asked Questions
Is there a grace period for a late tax return in Ireland?
There is no formal grace period, but the cost depends on how late you are. A return filed less than two months after the due date carries a 5% surcharge, capped at €12,695. After two months, the surcharge is 10%, capped at €63,485.
Do I pay a surcharge if I am owed a refund?
No. The surcharge is a percentage of the tax due, so if you owe no tax there is nothing for it to apply to. You should still file the return, though, because a refund claim generally has to be made within four years of the end of the tax year.
Does the ROS extension apply if I only file on ROS?
No. You must both file and pay through ROS to get the extended date of 18 November 2026. If you only do one of them through ROS, the standard 31 October 2026 deadline applies and the surcharge clock runs from that date.
Does paying on time stop the late filing surcharge?
No. The surcharge is for filing late, so paying the tax on time does not remove it. Paying on time does stop interest from building, which is why you should pay what you know you owe even when the return is still being finished.
How much interest does Revenue charge on late income tax?
Revenue charges interest at 0.0219% a day on late or underpaid tax. On €2,000 paid 60 days late, that comes to about €26.28. It is charged on top of any surcharge and runs until the tax is paid in full.
If your situation is a bit messier than the examples above, talking it through with a chartered accountant can usually sort it out in one conversation. We can tell you what your return is likely to cost, get it filed and set out a sensible way to pay.
