If you’re self-employed, a landlord, or have extra income in Ireland, the 31 October deadline already has a way of creeping up. For the 2025 tax return, Revenue has confirmed the Pay and File cutoff stays at 31 October 2026, with a ROS extension to 18 November 2026 for those who both file and pay online.

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Tax year in Ireland: 1 January – 31 December ·
Deadline for 2025 return (Form 11): 31 October 2026 ·
ROS extension deadline: 18 November 2026 ·
Late filing penalty (max): €3,000 ·
Interest on late tax: 0.0274% per day ·
Pay and File deadline: 31 October 2026

Quick snapshot

1Confirmed facts
2What’s unclear
  • Exact eligibility criteria for the ROS extension depend on Revenue’s discretionary assessment (Revenue eBrief)
  • Potential penalty leniency for taxpayers with good compliance history (Revenue eBrief)
3Timeline signal
  • 1 Jan 2026: Tax year starts
  • 31 Oct 2026: Standard Pay and File deadline
  • 18 Nov 2026: ROS extension deadline
4What’s next
  • File early via ROS to avoid the October rush (Kinore Guide)
  • Penalties and interest start after 31 October/18 November (Kinore Guide)

Seven key facts, one pattern: all deadlines center on late October and mid-November, and missing them triggers escalating costs.

Item Detail
Tax year start 1 January 2026
Tax year end 31 December 2026
Filing deadline (Form 11) 31 October 2026
ROS extension deadline 18 November 2026
Payment deadline 31 October 2026 (or 18 November via ROS)
Maximum late penalty €3,000
Daily interest on late tax 0.0274%

What date are tax returns due in Ireland?

Standard deadline for 2025 tax returns (Form 11)

  • The Pay and File deadline for the 2025 income tax return (Form 11) is Saturday 31 October 2026 (Revenue.ie – official guidance).
  • Form 11 covers self-assessment Income Tax and Capital Gains Tax for 2025 (Revenue.ie).

ROS Pay and File extension

  • Revenue offers an extension to 18 November 2026 for those who pay and file through ROS (Revenue eBrief No. 034/26).
  • To qualify, customers must both file their 2025 Form 11 and make payment through ROS (Chartered Accountants Ireland).
  • If only filing or only payment is done through ROS, the deadline remains 31 October 2026 (Chartered Accountants Ireland).

Deadline for employees with PAYE only

  • Employees whose only income is from PAYE generally do not need to file a Form 11 (Revenue.ie).
Bottom line: The 31 October 2026 deadline is hard for paper filers, but ROS users gain an 18-day extension to 18 November – provided they both file and pay online. For PAYE-only workers, no return is usually required.
The catch

You don’t automatically get the ROS extension: you must use the online portal for both filing and payment. One action on paper keeps you at the October deadline.

What happens if I don’t lodge my tax return by 31 October?

Late filing penalties

  • Late filing can result in a penalty of up to €3,000 (Chartered Accountants Ireland).
  • The exact penalty depends on the lateness and the amount of tax owed.

Interest charges

  • Interest accrues at 0.0274% per day on unpaid tax (Revenue.ie – interest on late tax).

Revenue enforcement actions

  • Revenue may pursue collection actions including attachment of earnings.
What to watch

Even if you can’t pay the full amount, file on time to avoid the surcharge. Then arrange a payment plan with Revenue.

The implication: late filing penalties start at the lower end but can escalate to the maximum €3,000 quickly depending on Revenue’s assessment.

What is the last day of the tax year 2026?

Tax year 2026 in Ireland

  • The Irish tax year runs from 1 January to 31 December (Kinore Guide).
  • The last day of the 2026 tax year is 31 December 2026.

Comparison with UK tax year

  • This differs from the UK tax year which ends on 5 April.

The pattern: Ireland follows a calendar tax year, unlike the UK’s April-to-April system, which means Irish filers have a cleaner alignment with the calendar but must file on the prior year’s income much later.

When can you file taxes for 2025 in 2026?

Earliest filing date

  • You can file your 2025 tax return from January 2026 onwards (Revenue.ie – self-assessment).

Benefits of early filing

  • Early filing helps avoid the rush and ensures timely refunds.

How to file online via ROS

  1. Register for ROS (Revenue Online Service) at revenue.ie.
  2. Gather your documents (P60, receipts, rental records).
  3. Complete Form 11 online.
  4. Submit and make payment through ROS.

The catch: early filers who use ROS for both submission and payment benefit from the extended deadline, but filing early itself triggers no penalties.

Do I need to file a tax return in Ireland?

Who must file a tax return

  • You must file if you are self-employed, have rental income, or receive income not subject to PAYE (Revenue.ie).
  • High earners with additional income. Also anyone issued a return by Revenue.

Exceptions for PAYE workers

  • PAYE employees with only one source of income generally do not need to file.

Self-assessment requirements

  • Revenue may request a return even if you are not normally required to file.

What this means: the self-assessment system in Ireland places the burden on the taxpayer to determine their filing obligation, with Revenue retaining the right to demand a return from anyone.

Key Dates and Timeline for 2026 Tax Filing

  • 1 January 2026 – Start of the 2026 tax year
  • 31 December 2026 – End of the 2026 tax year
  • 31 October 2026 – Filing and payment deadline for 2025 tax returns (Form 11)
  • 18 November 2026 – ROS Pay and File extension deadline (if eligible)
  • After 31 October/18 November 2026 – Late filing penalties and interest begin
Bottom line: Taxpayers who miss the 31 October or 18 November deadlines face penalties up to €3,000 plus daily interest, so marking both dates on your calendar is essential to avoid a financial sting.

What’s Confirmed and What’s Unclear

Confirmed facts

  • The deadline for 2025 tax returns is 31 October 2026 (or 18 November via ROS).
  • ROS extension is available for those who file and pay online.
  • Late filing penalties apply up to €3,000.
  • Interest on unpaid tax is 0.0274% per day.

What’s unclear

  • Exact eligibility criteria for the ROS extension depend on Revenue’s discretionary assessment.
  • Potential adjustments to penalties for taxpayers with a good compliance history.

Expert Perspectives

“The Pay and File deadline for the 2025 income tax return (Form 11) is Saturday 31 October 2026.”

– Revenue.ie, official guidance

“Revenue has announced that the ROS extension for 2025 returns will run to 18 November 2026.”

– Chartered Accountants Ireland, professional body

“Filing early via ROS helps you avoid the October crush and speeds up any refund.”

– Kinore Guide, tax filing resource

For the self-employed filer in Ireland, the choice is clear: use ROS and get until 18 November 2026 to both file and pay, or stick to 31 October and risk a €3,000 penalty. File early, pay on time, and you’ll keep Revenue happy without the headache.

Additional sources

orbitax.com, ey.com, vitallaw.com

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Frequently asked questions

Can I file my 2025 tax return after 31 October 2026?

Yes, but late filing penalties and interest will apply. The surcharge can be up to €3,000 and interest accrues daily.

How do I file a tax return online with Revenue?

Register for ROS (Revenue Online Service) at revenue.ie, gather your documents, complete Form 11 online, and submit. Payment can be made at the same time.

What records do I need to keep for a tax return?

Keep P60s, receipts for expenses, rental income statements, and any other documentation related to your income and deductions for at least 6 years.

Is there a penalty if I file on time but pay late?

Yes, interest at 0.0274% per day will apply on the unpaid amount from the due date.

Can I get an extension beyond 18 November?

Revenue does not typically grant individual extensions beyond the announced ROS deadline. Contact Revenue directly if you have exceptional circumstances.

What happens if I don’t file a tax return at all?

Revenue can impose penalties up to €3,000 and pursue enforcement actions including attachment of earnings or legal proceedings.

Do I need to file a return if I have a tax refund due?

Yes, you must file a return to claim a refund, even if you wouldn’t normally need to file. Revenue will process the refund after assessment.

Related reading

  • Revenue’s official Form 11 filing and payment deadlines
  • ROS Pay & File deadline guide and extension conditions