Income Tax Return (Form 11)
aka Form 11, Irish self-assessed return
The annual self-assessment income tax return for self-employed individuals, company directors with material interests, and taxpayers with non-PAYE income. Filed through ROS by 31 October (or mid-November via ROS Pay and File extension).
Last reviewed April 2026
Definition
Form 11 is the annual self-assessment income tax return filed with Revenue by self-employed individuals, proprietary directors, landlords, and PAYE taxpayers with significant non-PAYE income. It covers the full tax year (1 January to 31 December) and is due by 31 October of the following year, with a Pay and File extension to mid-November for ROS filers who both pay and file online. The return consolidates all sources of income (trade, profession, rental, dividends, foreign, investment), applies tax credits and reliefs (pension contributions, medical expenses, tuition fees), and calculates the balancing payment for the tax year just ended plus preliminary tax for the current year. Preliminary tax must be at least 90% of the current year's liability, or 100% of the prior year's (105% if paying by direct debit). Missing the filing deadline triggers a surcharge of 5% or 10% of the liability depending on lateness.
Why it matters for software choice
Self-employed Irish taxpayers carry two compliance burdens at once: bookkeeping during the year and the Form 11 at year end. Accounting software that maps its chart of accounts to Form 11 line items, tracks capital allowances, and exports a ROS-ready summary dramatically shortens the year-end close. Software that only produces a generic P&L and balance sheet forces an accountant-led re-classification exercise every year.
Authority sources
- Revenue: Form 11 for self-assessed individuals (www.revenue.ie)
- Revenue: Pay and File deadline (www.revenue.ie)
Software categories this affects
Vendors covered by this term
Surf Accounts
100% Irish-built cloud accounting with Revenue compliance and Dublin-based support
Big Red Cloud
Irish cloud accounting for small businesses and sole traders
Xero
Cloud accounting with direct AIB, BOI, and PTSB bank feeds for Irish SMEs
Related terms
ROS (Revenue Online Service)
Revenue's secure portal for businesses, agents and large filers. Used to file VAT3, Form 11, CT1, RCT notifications, PAYE submissions and to access Revenue Payroll Notifications (RPNs).
Corporation Tax (CT1)
The annual Corporation Tax return filed by Irish resident companies through ROS. Trading income is taxed at 12.5% (or 15% for large groups in scope of Pillar Two); passive income and certain non-trading profits are taxed at 25%.