Form 11 Income Tax Return in Ireland: 2026 Pay and File Deadline, Preliminary Tax and Surcharges

Staxo Team, 2026-09-16

If you are self-employed, a landlord, a company director with a shareholding, or a PAYE worker with other income, Revenue treats you as a chargeable person. Chargeable persons file a Form 11 every year under self-assessment. The return covers the previous tax year and is filed and paid under the pay and file system.

This guide explains who must file, what is due by the deadline, how the ROS extension works in 2026, how preliminary tax is calculated, and the surcharges that apply when a return is late.

Who must file a Form 11

Revenue's guidance describes a chargeable person as someone who is chargeable to tax on their own account for a tax year and is not dealt with fully through PAYE. In practice that means:

Sole traders and partners with income from a trade or profession.
Proprietary directors, meaning directors who own or control more than 15% of the company's share capital. Revenue treats a proprietary director as a chargeable person even if all their income is a PAYE salary from the company.
PAYE employees with other income where the net non-PAYE income is 5,000 euro or more, or the gross non-PAYE income is 30,000 euro or more, in the year.
Landlords, investors and anyone with foreign income above the same thresholds.
People who opened a foreign bank account or received share options in the year.

If your non-PAYE income is below both thresholds, you can usually declare it through myAccount on a Form 12 instead. When in doubt, register for self-assessment rather than wait for Revenue to write to you.

What is due by 31 October

Revenue's pay and file page sets out three things that must be done by 31 October each year:

File the Form 11 for the previous tax year.
Pay any balance of income tax owed for that previous year.
Pay preliminary tax for the current year.

So on 31 October 2026 a sole trader files the 2025 return, settles the 2025 balance, and pays preliminary tax for 2026. All three are due on the same day. New businesses are often surprised by the third item: in your first pay and file you can be paying for two years at once.

The ROS extension in 2026

Revenue extends the deadline for taxpayers who both file and pay through ROS. For 2026 the extended date is Wednesday 18 November 2026, announced in Revenue eBrief 034/26. The extension only applies if the Form 11 is filed on ROS and the payment is made on ROS. If either is done another way, the deadline stays at 31 October.

The extended date is announced by Revenue each year and moves around mid-November. Treat 31 October as the target and the extension as a safety margin, not a plan.

Preliminary tax: how much to pay

Preliminary tax is an estimate of the current year's income tax, USC and PRSI, paid before the year ends. Revenue's rule is that the payment must be at least the lowest of:

Option	Amount	Notes
Current year basis	90% of the final liability for the current year	Needs a good estimate of this year's profit
Prior year basis	100% of the final liability for the previous year	The usual choice; the figure is known
Pre-preceding year basis	105% of the liability for the year before last	Only where you pay by monthly direct debit, and not if that year's liability was nil

If you pay less than the lowest of these, Revenue charges interest from 31 October on the shortfall. In your first year of trading the prior year figure is usually nil, so you can pay nothing or pay 90% of the current year estimate to keep the following year's bill smaller.

USC and PRSI on the Form 11

The Form 11 calculates three charges together.

Income tax at 20% on income up to the standard rate band and 40% on the rest. For 2026 the band is 44,000 euro for a single person and 53,000 euro for a married couple or civil partners with one income.
USC on income over 13,000 euro. For 2026 the standard rates are 0.5% on the first 12,012 euro, 2% on the next 16,688 euro, 3% on the next 41,344 euro and 8% on the balance. Revenue adds a 3% USC surcharge on non-PAYE income over 100,000 euro.
PRSI Class S for the self-employed. The rate is 4.2% until 30 September 2026 and 4.35% from 1 October 2026, so the Department of Social Protection applies a blended rate of 4.2375% to 2026 self-employed income, with a minimum contribution of 650 euro.

Class S contributions count towards the State Pension and some other benefits, so paying them is not wasted money.

Surcharges for late filing

Filing late adds a surcharge to the tax due, on top of interest. Revenue's rules are:

Filed within two months of the deadline: 5% of the tax due, up to a maximum of 12,695 euro.
Filed more than two months late: 10% of the tax due, up to a maximum of 63,485 euro.

The surcharge is calculated on the full liability for the year before credits for tax already paid through PAYE or preliminary tax, so it can be large even where the balance owed is small. Interest on late payment is charged separately for each day past the due date.

Records to keep

Revenue requires records to be kept for six years from the end of the accounting period they relate to. Keep sales invoices, purchase invoices and receipts, bank statements, records of drawings, mileage and expense logs, and the working papers behind the figures on the return. Failing to keep proper records is a Revenue offence. If software or an agent holds your records, you remain responsible for them.

Pay and file checklist

Register for income tax self-assessment on ROS as soon as you start trading.
Close off the previous year's books by the end of March and prepare the accounts.
Estimate the current year's profit by September so you can choose a preliminary tax basis.
Check that PAYE income, rental income, dividends and foreign income are all on the return.
Claim the Earned Income Credit (2,000 euro for 2026) and any pension relief.
File and pay on ROS before 31 October, or by 18 November 2026 at the latest.
Save the ROS acknowledgement and the payment receipt.
Keep every record for six years.

Frequently asked questions

I am a director and take a salary through payroll. Do I still need a Form 11?

If you own more than 15% of the shares you are a proprietary director and a chargeable person. You file a Form 11 even if all your income has already been taxed under PAYE.

Can I file the Form 11 on paper?

Revenue's guidance says most individuals must file the Form 11 online. Paper filing is limited to specific cases, and paper filers do not get the ROS extension.

What if I cannot pay the full amount by the deadline?

File the return anyway to avoid the surcharge. Then contact Revenue about a phased payment arrangement. Interest runs on the unpaid amount but the surcharge is avoided.

Is the 18 November date the same every year?

No. Revenue announces the ROS extension each year. In 2026 it is 18 November. Check revenue.ie for the current year's date.

Sources

Staxo keeps a sole trader's income and expenses categorised through the year, so the figures for the Form 11 are ready long before October. See Staxo plans, or if you are only starting out, register as a sole trader with Staxo for 49 euro ex VAT.