When Is Tax Return 2025? Irish & UK Deadlines
Few annual tasks spark as much quiet anxiety as working out tax deadlines — especially when you’re juggling two different systems. If you’ve been wondering when to file your 2025 tax return, the answer splits neatly by country: Ireland’s Revenue and the UK’s HMRC run on entirely separate calendars, each with its own paper and online cutoff dates. This guide lays out both sets of deadlines side by side, so you know exactly when to act — and what happens if you miss the window.
2025 Irish tax return paper deadline: 31 October 2026 ·
2025 Irish tax return online extension deadline: 18 November 2026 ·
2025-26 UK Self Assessment online deadline: 31 January 2027
Quick snapshot
- Irish 2025 paper deadline: 31 October 2026 (Revenue.ie)
- Irish 2025 online extension: 18 November 2026 (TaxAssist Ireland)
- UK 2025-26 online deadline: 31 January 2027 (GOV.UK)
- UK 2025-26 paper deadline: 31 October 2026 (GOV.UK)
- Exact date when Irish 2025 returns become available for filing (assumed 1 January 2026).
- Whether the 18 November 2026 extension applies to all filers or only those using ROS.
- Whether the UK direct debit deadline of 30 December 2026 affects the filing deadline for all filers.
- How late-payment surcharges interact across both jurisdictions for dual-income filers.
- Irish tax year: 1 Jan – 31 Dec 2025; UK tax year: 6 Apr 2025 – 5 Apr 2026.
- Both paper deadlines are 31 Oct 2026; online deadlines diverge.
- File early to avoid penalties and secure refunds faster.
- Apply for extensions via ROS (Ireland) or direct debit (UK).
The two countries share one paper deadline — 31 October 2026 — but their online calendars diverge sharply, creating a potential trap for anyone with income in both jurisdictions.
| Label | Value |
|---|---|
| Jurisdiction | Ireland / United Kingdom |
| Tax year covered | Ireland: 2025 (Jan–Dec 2025) / UK: 2025-26 (Apr 2025–Apr 2026) |
| Paper return deadline | Ireland: 31 Oct 2026 / UK: 31 Oct 2026 |
| Online return deadline | Ireland: 18 Nov 2026 (with extension) / UK: 31 Jan 2027 |
| Late filing penalty | Ireland: €1,000+ / UK: £100+ (increases after 3 months) |
When can I start my 2025 tax return?
Filing opens for the 2025 Irish tax year
- Ireland’s income tax year runs from 1 January to 31 December 2025. You can submit your 2025 return from 1 January 2026 (TaxAssist Ireland).
- The system is FIFO (first-in, first-out): returns filed early are processed faster, and refunds for overpaid tax flow sooner.
Filing opens for the 2025-26 UK tax year
- The UK tax year runs from 6 April 2025 to 5 April 2026. You can start your Self Assessment return from 6 April 2026 (GOV.UK).
- There is no advantage to waiting: early filers reduce the risk of missing the paper deadline if they prefer a physical return.
For anyone with Irish and UK income, the staggered start dates mean you cannot file both returns on the same day. The UK’s April-to-April system lags three months behind Ireland’s calendar-year structure, requiring separate diary entries.
The pattern: both countries let you file immediately after the tax year ends, but the UK’s later start (April vs January) creates a lull for cross-border filers. The implication: mark 1 January 2026 for Ireland and 6 April 2026 for the UK — then file as soon as you have your P60s and receipts ready.
When can I submit my tax return for 2025?
Submitting your Irish 2025 return
- You can submit your Irish 2025 return as soon as the tax year ends. The Pay and File deadline is 31 October 2026 for paper returns or 18 November 2026 if filing and paying through Revenue Online Service (ROS) (TaxAssist Ireland).
- The ROS extension requires you to both file and pay preliminary tax for 2026 by 18 November 2026.
Submitting your UK 2025-26 return
- For the UK, the online deadline is 31 January 2027. Paper returns must reach HMRC by 31 October 2026 (GOV.UK).
- If you plan to pay by direct debit, you must submit by 30 December 2026 (FreeAgent).
Paper filers in both countries face the same October deadline, but Ireland offers an 18-day grace period for ROS users. UK filers get three extra months online — but only if they use digital channels. Direct debit payers must act even earlier, by 30 December 2026.
The implication: if you prefer paper, your diary is identical for Ireland and the UK — 31 October 2026. If you file online, Ireland gives you a short extension while the UK grants a much longer window.
What date do Irish tax returns have to be submitted?
Paper return deadline for Ireland 2025
- The deadline for the Irish 2025 Form 11 paper return is 31 October 2026 (TaxAssist Ireland).
- Late paper filers face an initial penalty of €1,000, with additional surcharges after that.
Online return deadline and extension for Ireland 2025
- If you use ROS, the extended deadline is 18 November 2026 (TaxAssist Ireland).
- Non-ROS filers are still bound by the 31 October 2026 deadline.
The 18 November extension is not automatic — you must file and pay through ROS. Self-employed individuals who do not register for ROS lose the extra 18 days.
The pattern: Ireland’s two-tier system rewards digital filing with a small calendar advantage. The implication: anyone who can use ROS should, even if only for the buffer days.
How early can I submit my 2025 tax return?
Earliest possible filing date for Ireland
- You can submit your Irish 2025 return from 1 January 2026 (TaxAssist Ireland).
- Filing early means Revenue processes your refund sooner — useful if you overpaid PAYE during 2025.
Earliest possible filing date for UK
- You can submit your UK 2025-26 return from 6 April 2026 (GOV.UK).
- Early filing also helps you lock in a payment schedule: direct debit set-up requires submission by 30 December 2026 (FreeAgent).
Filing early in either jurisdiction reduces the chance of missing a deadline and accelerates refunds. Irish filers who submit from January 2026 can expect faster processing from Revenue.
The pattern: earliest filing dates align with the start of each country’s tax year plus one day. The implication: set calendar alerts for 1 January 2026 (Ireland) and 6 April 2026 (UK) to file at the earliest opportunity.
When can I claim tax back for 2025?
Claiming a refund on your Irish 2025 return
- If you overpaid tax in Ireland during 2025, you can claim a refund when filing your 2025 return after 1 January 2026 (TaxAssist Ireland).
- Revenue processes early returns faster, meaning refunds for overpaid PAYE can arrive within weeks.
Claiming a refund on your UK 2025-26 return
- You can claim a refund for the 2025-26 tax year by submitting your Self Assessment return before the deadline (GOV.UK).
- Early filers can expect quicker repayment from HMRC, especially if using online channels.
Ireland’s Revenue generally processes refunds faster for early filers due to the FIFO system, while UK refunds depend on HMRC’s processing queue. Filing early in both cases reduces waiting time.
The implication: if you are due a refund in either jurisdiction, file as soon as the window opens. Ireland’s FIFO system rewards speed more directly, but UK filers also benefit from avoiding the post-Christmas rush.
Related reading: Self Assessment tax returns deadlines · Everything you need to know about filing a tax return in Ireland
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For a detailed breakdown of the exact dates and penalties, check out the full guide on 2025 Irish tax return deadlines.
Frequently asked questions
What happens if I miss the 2025 tax return deadline?
In Ireland, late paper filers face an initial penalty of €1,000 followed by additional surcharges. In the UK, the initial penalty is £100, increasing after three months. Both jurisdictions add interest on unpaid tax.
Can I file my 2025 tax return before the tax year ends?
No. Both Ireland and the UK require the tax year to end before you can file. Ireland’s 2025 year ends on 31 December 2025; the UK’s 2025-26 year ends on 5 April 2026.
Is there a penalty for filing late in Ireland?
Yes. Late paper filers face an initial penalty of €1,000. Additional surcharges apply if the return is filed after 31 October 2026 without using ROS.
How do I get an extension on my tax return?
In Ireland, you get an 18-day extension (to 18 November 2026) by filing and paying through Revenue Online Service (ROS). In the UK, the online deadline is automatically later (31 January 2027) than the paper deadline.
Do I need to file a tax return if I only have employment income?
In Ireland, PAYE employees may not need to file Form 11 if tax is fully deducted at source. In the UK, you generally do not need to file if your tax is already correctly deducted through PAYE and you have no additional income.
Can I claim a tax refund if I overpaid in 2025?
Yes. In Ireland, file your 2025 return after 1 January 2026 and Revenue will process any overpayment. In the UK, file your Self Assessment return before the deadline to claim a refund for the 2025-26 tax year.
What documents do I need to file my 2025 tax return?
You need your P60, receipts for deductible expenses, bank interest statements, and any records of additional income. For Ireland, you also need your Preliminary Tax computation if using ROS.
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