Who must file an income tax return in Ireland, the tax year and deadline, what documents you need, how to file with Revenue Commissioners, and what happens if you are late.
Free
No sign-up
Nothing uploaded
Updated for 2026
Last reviewed September 2026
Who must file
In most countries, anyone with income above the tax-free amount who was not fully taxed through payroll withholding must file: the self-employed, landlords, company directors and anyone with more than one income source. Companies file their own return. Check Revenue Commissioners's rules for employees, who are sometimes exempt or auto-assessed.
Self-employed people, company directors and anyone with non-PAYE income over €5,000 file Form 11; PAYE workers file only to claim credits or declare small extra income.
Tax year and deadline
Every country fixes a tax year and a filing deadline a few months after it ends. Revenue Commissioners publishes both. Put the deadline in your calendar with a reminder a month before, because late filing is penalised even when no tax is due.
Tax year: 1 January to 31 December.
Tax year is the calendar year; Form 11 and preliminary tax are due 31 October, extended to mid-November for ROS filers.
What you need
Your VAT number and login for Revenue Commissioners's online service.
Employment income statements from each employer showing pay and tax withheld.
Your invoices, bank statements and expense records if you are self-employed.
Certificates for pension contributions, insurance, donations and other reliefs you will claim.
Last year's return, to check nothing is missed.
Filing step by step
Log in to Revenue Commissioners's online service on Revenue Online Service (ROS) and myAccount and open the return for the year.
Check any pre-filled income against your own records and add anything missing.
Enter business income and allowable expenses, then reliefs and deductions with the supporting figures.
Review the calculation, submit, and save the acknowledgement. Pay any balance by the payment deadline.
Employees and salary tax
Employers in Ireland withhold income tax from salaries under the 2025 bands and pay it to Revenue Commissioners. The Ireland salary tax calculator shows the tax and take-home for any gross salary, which is a quick way to check your payslip before you file.
If you are late
Late returns attract a fixed penalty and late payment attracts interest, both set by Revenue Commissioners. File even if you cannot pay in full; penalties for not filing are usually heavier than for paying late, and most authorities allow instalment plans.
Questions people ask
Do I need to file if my employer already deducted tax?
It depends on Ireland's rules. Some countries require every taxpayer to file, some auto-assess employees, others exempt employees with a single employer and no other income. The rule for Ireland is set out above.
What if I had no income?
If you are registered with Revenue Commissioners, you may still have to file a nil return. Failing to do so is treated as a late return in many countries.
Can I file late without a penalty?
Rarely. Some authorities allow an extension if requested before the deadline. Otherwise file as soon as possible; penalties often grow with time.
Should I use an accountant?
If you are employed with no other income, the online service is designed for you. If you run a business or have foreign income or property, an accountant usually saves more than the fee.
Written from published tax-authority guidance and reviewed on 2026-09-03. Everything here is indicative rather than a ruling on your circumstances, and rules change. Confirm anything you rely on with Revenue Commissioners before acting on it, and tell us if you find something out of date so we can correct it.
This guide explains the rules in general terms and is not tax advice for your circumstances. Confirm your position with a qualified adviser or with Revenue Commissioners.
🇮🇪 Ireland
Tools for Ireland
Invoices, quotations, purchase orders, credit notes and waybills in EUR, with VAT and the VAT number on the document. Plus a VAT calculator and a salary tax calculator. Everything runs in your browser and nothing is uploaded.