1–3 hrs
First-time filers
Form 11
Self-assessed (ROS)
19 Nov
ROS deadline 2025
6 Years
Keep records
Which System Do You Use?
Before you start, confirm which Revenue platform applies to your situation. The two systems are completely separate — log into the wrong one and you will not find your return.
ROS — Revenue Online Service
ros.ie — for Form 11
ROS deadline 2025: 19 November 2025
myAccount
revenue.ie/myaccount — for Form 12
myAccount deadline: 31 October (or anytime for prior 4 years)
Documents to Gather Before You Start
Having everything to hand before you open ROS or myAccount saves significant time. Revenue pre-populates some figures from employers and banks — but do not rely on them being complete or correct.
Every taxpayer
- PPS number
- P60 or Employment Details Summary
- Bank interest certificates (from your bank)
- Medical receipts (GP, dentist, prescriptions)
- BIC/IBAN if expecting a refund
- Previous year's Notice of Assessment (for reference)
Sole traders and self-employed
- Profit and loss account for the year
- Total turnover figure
- Capital allowances schedule (if claiming)
- Business expense receipts or summary
- Subcontractor or RCT details if applicable
- Previous year's balancing statement
Landlords (rental income)
- Total rental income received
- Mortgage interest certificate (from lender)
- Insurance premium receipts
- Letting agent fees if used
- Repair and maintenance receipts
- Rates and management fees paid
Note: Mortgage interest relief for landlords was restored at 100% for 2024 onwards — ensure you have your interest certificate from your lender.
Company directors
- Director's salary (P60 from the company)
- Dividend certificates and amounts paid
- Benefit-in-kind valuations if applicable
- Loan account balance at year end
- Company's CT1 return reference (for cross-checking)
Completing Form 11 in ROS — Panel by Panel
Form 11 is divided into numbered panels inside ROS. Here is what each main panel covers and the key things to watch.
Personal Details
Verify your name, address, PPS number, and marital status. If you are jointly assessed with a spouse or civil partner, confirm the assessable spouse election. An error here affects which credits you receive.
Joint assessment saves money — but one spouse must be nominated as assessable spouse. Check this is set correctly.
Income from Employment (Schedule E)
Revenue pre-fills this from employer P35 submissions. Check the figure against your P60 or Employment Details Summary. Include any benefit-in-kind from your employer (e.g., company car, health insurance, gym membership) — these are taxable.
Benefit-in-kind is commonly missed. Your employer should provide a BIK valuation — if in doubt, check your payslips for a BIK indicator.
Income from Self-Employment (Schedule D, Case I/II)
Enter your net profit from self-employment. This is turnover minus allowable business expenses. Do not enter turnover — Revenue wants net profit. If you made a loss, enter zero and carry the loss forward using the relevant field.
Enter net taxable profit, not gross revenue. Common mistake is entering turnover here, which causes a large overpayment.
Rental Income (Schedule D, Case V)
Enter gross rents received, then deduct allowable expenses: mortgage interest (100% from 2024), insurance, repairs, letting fees, rates. The net rental profit is taxable. Pre-letting expenses are allowable if incurred within 12 months of first letting.
If you claim the Rent-a-Room relief and receipts are under €14,000, this is exempt — do not enter it here.
Other Income (Dividends, Interest, Foreign Income)
Declare Irish deposit interest (DIRT is usually deducted at source but still declared), foreign interest, dividends from Irish or foreign companies, and any foreign employment income. Foreign income may have a treaty credit to offset double taxation.
DIRT paid does not automatically mean it is credited — you must declare the interest and Revenue matches it against DIRT paid.
Deductions and Reliefs
Claim pension contributions (PRSA, occupational, AVC), covenants, patent royalties, and losses from prior years. Pension relief is significant — contributions within age-related limits get full income tax relief at your marginal rate.
Age limits apply to pension relief: under 30 = 15%, 30–39 = 20%, 40–49 = 25%, 50–54 = 30%, 55–59 = 35%, 60+ = 40% of net relevant earnings.
Tax Credits
Review all credits. The personal credit (€1,875 single, €3,750 married) and earned income credit (€1,875 for self-employed) should appear automatically. Add medical expenses (20% relief), flat rate expenses, home carer credit, rent tax credit, tuition fees, and dependent relative credit.
Medical expenses are only claimable at 20% and only for qualifying health expenses. Cosmetic procedures generally do not qualify.
Preliminary Tax
Self-assessed taxpayers must pay preliminary tax for the current year alongside the prior year balance. Your preliminary tax must be at least 90% of your final liability for the current year, OR 100% of last year's final liability, OR 105% of last year's liability paid by direct debit. Paying 100% of last year is usually the safest option.
Underpaying preliminary tax results in interest charges at 8% per annum. Overpayment is refunded with no interest.
Capital Allowances
If you purchased business equipment, vehicles, or machinery, claim capital allowances here. Standard rate is 12.5% per year over 8 years (reducing balance method). Certain energy-efficient equipment may qualify for 100% accelerated allowances in year 1.
A car used partly for business is restricted — only the business-use portion qualifies, and there are CO2 emission thresholds that cap the allowable cost.
ROS lets you save progress — use it
Click Save Draft regularly. ROS times out after a period of inactivity. Losing a half-completed Form 11 is frustrating. Save after each panel.
Completing a Form 12 in myAccount
For PAYE employees with straightforward tax affairs, myAccount is significantly simpler than ROS. Most of your income is pre-filled. The main reasons to use it are claiming credits and refunds, or declaring minor additional income.
- 1
Log in at revenue.ie/myaccount
Use your PPS number and password, or login via MyGovID. First time? Register using your PPS number, date of birth, and PPSN details from a Revenue document.
- 2
Go to 'Review Your Tax' for the relevant year
Select the tax year you are completing (e.g., 2024). myAccount opens a summary screen showing your income and tax as Revenue currently has it.
- 3
Check your employment income
Revenue pre-fills from your employer. If you had multiple jobs during the year, check all appear. If something is missing or wrong, you can edit the figure and attach a note.
- 4
Add any additional income
Declare bank interest, dividends, or rental income under €5,000. For amounts over €5,000 net, you must file through ROS instead.
- 5
Claim your credits and reliefs
Add medical expenses (doctor, dentist, physio — keep receipts), rent tax credit (€750 per person for 2024), home carer credit, flat rate expenses, tuition fees. Each credit reduces your tax bill directly.
- 6
Review the outcome
myAccount calculates whether you are due a refund or owe additional tax. If a refund, ensure your bank account is registered (IBAN). Refunds typically arrive within 5 working days.
- 7
Submit and save confirmation
Submit the return. Revenue sends a balancing statement (P21) showing the final position. Download and save this — it may be needed for mortgage applications or SUSI grants.
Preliminary Tax — What It Is and How to Calculate It
This is the most misunderstood part of self-assessment. Every self-assessed taxpayer must pay preliminary tax for the current year at the same time they file and pay for the prior year. So in November 2025 you pay: (1) any balance owed for 2024, and (2) preliminary tax for 2025.
Three safe methods for calculating preliminary tax
Option A — 90% of current year liability
Estimate your 2025 income and pay 90% of what you expect to owe. Accurate if your income is predictable. Best for growing businesses.
Option B — 100% of prior year liability
Pay exactly what you owed for 2024. Safe and simple. No risk of underpaying. Preferred by most accountants for clients with stable income.
Option C — 105% of prior year by direct debit
Pay 105% of last year's liability via monthly direct debit through ROS. Spreads the cost over the year. Available only if set up before 1 November.
Interest on underpayment: If you underpay preliminary tax, Revenue charges interest at 8% per annum on the shortfall. This is calculated daily from the due date. Even a small underpayment costs more than paying the correct amount upfront.
Common Mistakes to Avoid
Entering gross turnover instead of net profit
Panel 3 (Schedule D Case I/II) wants your taxable profit — not your total invoices. Entering turnover inflates your liability dramatically.
Not declaring all income sources
Revenue receives information from banks, employers, Revenue Commissioners, and foreign tax authorities. Omitting income sources — even small amounts of foreign interest — creates a mismatch that triggers a review.
Missing the rent tax credit
The Rent Tax Credit (€750 per person, €1,500 for a couple in 2024) is claimed through myAccount or Form 11. Many PAYE renters do not realise they can claim this, even for prior years.
Claiming non-qualifying medical expenses
Only qualifying health expenses under Section 469 TCA 1997 qualify. Gym memberships, vitamins, and most over-the-counter items do not. Claim what qualifies — GP, consultant, physiotherapist, prescribed medicines.
Not registering for ROS before the deadline
ROS registration can take 5–8 business days — a physical letter is posted to your registered address with your access code. Register by late October at the latest if you have never used ROS before.
Forgetting the preliminary tax payment
Filing on time but not paying preliminary tax still triggers an interest charge. Payment and filing are separate steps in ROS — complete both.
Not claiming capital allowances in full
Many sole traders miss capital allowances on equipment, computers, and vehicles. These spread the cost over 8 years at 12.5% per year and reduce taxable profit each year.
After You Submit — What Happens Next
Acknowledgement
ROS and myAccount display a confirmation screen immediately. Print or save this — it contains your submission number and timestamp.
Notice of Assessment
Revenue issues a Notice of Assessment (NOA) — typically within 2–4 weeks for ROS filers. This is Revenue's formal calculation of your liability. Check it against your return figures.
Balancing statement (P21)
For PAYE filers, the system immediately generates a P21 balancing statement showing refund or underpayment. Refunds are processed to your registered bank account within 5 working days.
Revenue audit risk
A small percentage of returns are selected for audit each year — either random or risk-based. Keeping accurate records for 6 years means you can respond quickly if selected. Cooperating early reduces penalties significantly.
Deadlines for 2025
Paper Form 11: 31 October 2025
ROS online Form 11 + payment: 19 November 2025
Preliminary tax 2025: also 19 November 2025 (paid via ROS)
Late filing surcharge: 5% of tax due (max €12,695) if within 2 months late; 10% (max €63,485) if more than 2 months late.
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