Income Tax
How to File Your Income Tax Return in Ireland (2026)
TL;DR
If your non-PAYE income is over €5,000, you file a Form 11 self-assessment return on ROS by 31 October, or mid-November if you file and pay online. You declare your income, claim your credits and expenses, pay any balance for last year, and pay preliminary tax for this year.
Who has to file an income tax return in Ireland?
You must file a self-assessment return if you are a chargeable person, which broadly means you have income that is not taxed under PAYE. That covers sole traders, company directors, landlords, and PAYE workers with significant extra income.
The key threshold is €5,000. If your gross non-PAYE income is more than €5,000 (or net assessable income over €3,174), you are a chargeable person and must file a Form 11. Below that, you usually declare smaller amounts through the simpler Form 12.
Form 11 versus Form 12: which do you file?
The Form 11 is the full self-assessment return for chargeable persons. It captures all your income, reliefs, and your preliminary tax for the following year, and it is filed through Revenue's Online Service (ROS).
The Form 12 is for PAYE taxpayers with modest additional income below the chargeable threshold. It can be filed through myAccount. If you are unsure which applies, a quick check of your figures settles it.
The income tax deadline
The paper deadline is 31 October. If you both file and pay through ROS, Revenue grants an extension to mid-November each year. File late and a surcharge applies: 5% of the tax due, rising to 10% if you are more than two months late. Always confirm the current year's dates on revenue.ie.
What you can claim
Claiming everything you are entitled to is where a good return saves you money. Common reliefs and credits include:
- Business expenses incurred wholly and exclusively for the trade
- Pension contributions, within age-related limits
- Health and medical expenses at the standard rate
- The Rent Tax Credit, where you pay for private rented accommodation
- Capital allowances on equipment and vehicles used for work
Understanding preliminary tax
Preliminary tax catches people out. With your return you not only pay any balance owing for last year, you also pay preliminary tax towards this year. To avoid interest, you generally pay at least 90% of the current year's liability, or 100% of the previous year's.
This is why the first year of self-assessment can feel heavy: you can end up paying for two years at once. Planning ahead, which we do with every client, takes the shock out of it.
How to file on ROS
You file through ROS using your digital certificate. You complete the Form 11, the system calculates the tax, and you pay by card or direct debit. Keep your records for six years in case Revenue raises a query.
If that sounds like a lot, it is. Most people would rather hand the whole job to someone who does it every day, get a clear figure to pay, and never think about ROS again.
Would you rather we just handled it?
Our income tax return service, on a fixed fee.
Income Tax
Frequently asked questions
When is the income tax return deadline in Ireland?
The deadline is 31 October, extended to mid-November if you file and pay through ROS online. Filing late triggers a surcharge of 5% rising to 10% of the tax due. Confirm the current dates on revenue.ie.
Do I need to file a tax return for rental income?
If your gross non-PAYE income, including rent, is over €5,000, yes, you file a Form 11. Below that you usually use a Form 12. Either way the rental income, less allowable expenses, must be declared.
What happens if I file my tax return late?
A late return brings a surcharge: 5% of your tax bill (capped) if under two months late, and 10% if more. Interest can also accrue on unpaid tax. Filing on time, even if you cannot pay in full, avoids the surcharge.
Can I file my own income tax return?
Yes, through ROS, if you are comfortable with the Form 11 and preliminary tax. Many people prefer to use an accountant to make sure every credit is claimed and the preliminary tax is right, often saving more than the fee.
How much tax will I pay as a sole trader?
You pay income tax at 20% and 40%, plus USC and PRSI, on your profits after expenses, the same rate bands as a PAYE worker. Your exact bill depends on your profit and personal circumstances, which is what the return calculates.