Money Matters

How to prepare and file your tax return in Ireland: A practical checklist

Learn how to prepare and file your tax return in Ireland with a practical checklist covering Form 11, ROS deadlines, records, expenses and tax reliefs.

Published 12 November, 202615 min read Share

Key takeaways

• The standard Pay and File deadline for the 2025 return was 31 October 2026. However, if you file your Form 11 and make the required payment through ROS, you have until Wednesday 18 November 2026.
• If you’re self-employed or otherwise fall within Revenue’s self-assessment rules, you’ll generally need to file Form 11 through ROS. PAYE taxpayers who meet Revenue’s non-PAYE income thresholds may also need to register for self-assessment.
• If your non-PAYE income is below Revenue’s self-assessment thresholds, you may be able to declare it through myAccount instead.
• You may also be able to claim tax relief or credits for qualifying medical expenses, tuition fees and rent.

If you’re using the ROS extension, you need to file and pay by 18 November 2026.

This article explains how to prepare for your tax return, avoid common mistakes and make the filing process easier.

Tax rules can change, so check the latest Revenue guidance or speak to a qualified adviser if you’re unsure.

In addition, Galway-based accountant, Niall Mooney, who manages Accurate Accounting,  gives advice on the dos and don’ts.

This is what we cover: 

Who needs to file a tax return?

If you’re self-employed, a landlord, a proprietary director or otherwise fall within Revenue’s self-assessment rules, you’ll generally need to file Form 11.

If you’re a PAYE taxpayer with other income, you may be able to declare it through myAccount instead.

Who generally needs to file Form 11

• Sole traders, freelance workers, landlords and proprietary directors who control more than 15% of the company’s ordinary share capital, directly or indirectly.
• If your net assessable non-PAYE income is €5,000 or more, or your gross non-PAYE income is €30,000 or more, check whether you need to register for self-assessment.

Taxpayers who fall into this group need to file a Form 11 self-assessment tax return using the Revenue Online Service (ROS).

PAYE taxpayers using myAccount

• PAYE employees can use myAccount to manage many tax credits and reliefs, including qualifying health expenses and the Rent Tax Credit.
• If your non-PAYE income is below Revenue’s self-assessment thresholds, you may be able to declare it through myAccount instead.

Check Revenue’s guidance to confirm whether you should declare the income through myAccount or register for self-assessment.

When is the deadline?

• The standard Pay and File deadline for the 2025 Income Tax Return was 31 October 2026. However, if you file your Form 11 and make the required payment through ROS, you have until Wednesday 18 November 2026. The extension covers your 2025 return, any balance due for 2025 and your 2026 preliminary tax. If you file or pay another way, the extension doesn’t apply.

• The paper-filing deadline for the 2025 return was 31 October 2026.

Revenue requires most taxpayers in self-assessment to file online.

Paper filing is available only in limited circumstances, so check Revenue’s guidance if you cannot use ROS.

Paper returns are only intended for taxpayers who are unable to use online services and whose tax affairs are uncomplicated.

This could include someone without internet access or a person with a disability.  

Should you hire an accountant?

Whether you need an accountant depends on the complexity of your finances and how confident you are preparing the return yourself.

If you’re unsure about your tax position or what you need to report, getting professional advice can help.

While the process is fairly straightforward, mistakes are made. “Entering figures in the wrong fields is common. And simply putting a loss in as a profit can have enormous implications.  It needs to be done carefully and seek advice if unsure,” says Niall.

An accountant can also help you identify expenses and reliefs you may be entitled to claim.

You’ll need to factor in their fees, and how much help you need will depend on your circumstances.

Qualifying accountancy costs incurred for your business may be deductible as a business expense.

Your accountant can also file your tax return on your behalf.

If you authorise a tax agent to act on your behalf, they can use Revenue’s online services to manage relevant tax matters and file returns for you.

PAYE taxpayers can claim eligible tax refunds directly through Revenue’s myAccount service.

Commercial tax-refund services are also available, but they may charge a fixed fee or take a percentage of your refund, so check the terms and costs before using one.

Should you use accounting software?

Keeping accurate digital records throughout the year can make preparing your tax return much easier.

If transactions are recorded regularly and accurately, it will simplify the preparation of the business accounts required for a tax return.  

Cloud accounting software can also make it easier to work with your accountant by giving them access to up-to-date financial records, where you choose to provide access.

What happens if you miss the deadline?

If you file late, you may face a surcharge even if you paid your tax on time.

Late payment can also lead to separate interest charges.

• Surcharges: filing late can result in a surcharge of 5% of the tax due, up to a maximum of €12,695, if you file within two months of the deadline. If you file more than two months late, the surcharge increases to 10%, up to a maximum of €63,485.
• Late-payment interest is separate from the filing surcharge. Check Revenue for the current rate.

What is preliminary tax?

Income Tax rates and bands are the same for self-employed and PAYE taxpayers.

However, how you pay, and your PRSI and USC position, will be different.

If you have qualifying earned income, you may be entitled to the Earned Income Credit.

The credit is worth the lower of €2,000 or 20% of qualifying earned income.

It doesn’t apply to rental or investment income, and its combined value with the Employee Tax Credit cannot exceed the Employee Tax Credit maximum.

When submitting your tax return, you are filing and paying for the previous tax year.

However, you must also pay preliminary tax for the current year.

Think of preliminary tax as an advance payment towards your Income Tax, PRSI and USC for the current year.

There are different rules in your first year of self-assessment, and Revenue may charge interest if you don’t pay enough preliminary tax.

The amount of preliminary tax for a year must be equal to, or more than, the lowest amount of the following:

• 90% of the tax due for the current tax year.
• 100% of the tax due for the immediately previous tax year.
• 105% of the tax due for the tax year preceding the immediately previous tax year (often called the pre-preceding year). This option only applies where you pay by direct debit. It does not apply if the tax due for the pre-preceding year was nil.

What business expenses can you claim?

You may be able to deduct expenses that are incurred wholly and exclusively for your trade.

Depending on your business, these could include:

• Purchase of goods for re-sale.
• Employees’ pay.
• Relevant staff training costs.
  Rent and bills for your business premises.
• Rates.
• Running costs of vehicles or machinery used in your business.
• Accountancy fees.
• Interest paid on business loans.
• Leasing payments on vehicles or machinery used in the business.

You may also be able to claim capital allowances when you buy qualifying assets for your business.

The rules and rates vary depending on the asset, so check Revenue’s guidance before claiming.

There are different rates available depending on the type of asset.

Niall has a word of caution: “Do not claim unsupported expenses. Not all costs are allowable, but in a world where the cost of living has gone through the roof, the temptation to claim as much as possible is there. Trust me, it’s not worth the lack of sleep.”

However, he says, legitimate expenses are often missed:

“There are legitimate claims that people do miss and they can be quite sizeable. While household costs, personal motor use, entertainment are out, you can claim expenses incurred in the home for working remotely and home office. Just keep the receipts and invoices separate between what is work and personal.”

If you’re self-employed, this doesn’t mean you can claim all your household costs.

You may be able to claim the proportion that relates wholly and exclusively to your business, so keep clear records showing how you worked this out.

How do pension contributions work?

Eligible pension contributions can qualify for Income Tax relief and help you build income for retirement.

If you make eligible pension contributions, you could receive Income Tax relief at your marginal rate of 20% or 40%.

How much you can claim depends on your age and earnings.

How you receive the relief depends on how you make the contribution.

If you do not make your pension contributions through your pay and instead make a lump-sum contribution, you can claim the tax relief directly through myAccount or by submitting a Form 11 if you are self-employed.

The maximum percentage of your earnings that you can put into a pension and claim tax relief on depends on your age.

Age-related percentage limit for tax relief on pension contributions
Age	Percentage limit
Under 30	15%
30-39	20%
40-49	25%
50-54	30%
55-59	35%
60 or over	40%

Revenue gives the example of an employee aged 42 who earns €40,000 a year and can receive tax relief on annual pension contributions of up to €10,000.

Total earnings limit

The maximum amount of earnings taken into account for calculating tax relief is €115,000 per year.

What other expenses can you claim?

Aside from business expenses, there are a variety of employee and personal expenses, tax reliefs and deductions that you can claim.

Below is a list of the main expenses:

Medical and health expenses

You can claim 20% relief on medical, prescription, doctor, consultant, maternity, and physiotherapy expenses.

If you have health insurance, you must claim through your insurance provider first and then claim the balance through Revenue. 

You can also claim 20% relief on non-routine dental work, such as crowns, braces, and root canals. Routine procedures such as cleanings and fillings do not qualify.

 In addition, you can claim relief at your marginal tax rate (up to 40%) on fees paid for nursing home care.

Rent Tax Credit

The Rent Tax Credit is a credit that has increased significantly in recent years.

The Rent Tax Credit is worth 20% of the qualifying rent you pay, up to €1,000 for an individual or €2,000 for a jointly assessed couple in 2026.

Budget 2027 announced increases to €1,150 and €2,300 respectively for 2027 and 2028.

However, those increases depend on the Finance (No. 2) Bill 2026 being enacted, so check the latest position before claiming.

This credit can also be claimed for the rent you pay for your child to attend an approved third-level course.

You should take reasonable steps to provide the Residential Tenancies Board (RTB) registration number when making your claim, where one is required.

Revenue may ask you to provide the number later if it is not available when you first claim the credit.

Rent-a-room Relief scheme

If you rent out a room in your main home, you may qualify for Rent-a-Room Relief if your gross rental income is €14,000 or less in 2026.

Be careful with the limit: if your gross income goes above €14,000, the full amount becomes taxable.

Lettings to your child, your employer or short-term guests do not qualify.

Budget 2027 announced that the annual limit would rise to €16,000 from 1 January 2027.

However, this depends on the Finance (No. 2) Bill 2026 being enacted, so check the latest position before relying on it.

But beware, even if the amount is below the tax-free threshold and is fully exempt from tax, you must declare the rental income to Revenue each year.

Flat rate expenses

An expense that PAYE workers often forget to claim is flat rate expenses.

Flat rate expenses are fixed annual deductions.

They cover certain employment-related expenses, such as tools, uniforms and statutory registration fees.

Flat-rate expenses are available for a range of occupations, including some nurses, teachers, journalists and panel beaters.

Remote Working Relief

If you work from home, you may be able to claim Remote Working Relief on qualifying:

• Electricity
• Heating
• Broadband

The amount you can claim depends on your eligible costs and the number of days you worked from home.

This does not include times you may have brought work home to do outside your normal working hours.

Your employer can choose to pay you up to €3.20 tax-free for each day you work remotely, although they don’t have to offer this payment.

If they contribute towards your remote-working costs, deduct that amount when calculating any Remote Working Relief claim.

Third-level tuition fees

You can claim 20% tax relief on qualifying fees for approved courses and colleges, including eligible courses outside Ireland.

The maximum qualifying fee is €7,000 per person, per course, for each academic year.

A disregard currently applies of €3,000 for full-time courses and €1,500 for part-time courses.

Only one disregard applies to the total qualifying fees you claim in a tax year.

Proposed changes to these amounts are not yet law, so check Revenue’s latest guidance before claiming.

What do you need to prepare your tax return?

To help you get prepared, below is a checklist of the type of information you will need to have at hand when preparing and filing your tax return.

1. Access Information

• PPS Number: Your Personal Public Service number.
• ROS or myAccount Access: Ensure your ROS digital certificate is renewed, or login credentials are active.
• Prior-year notices: Your previous year’s Notice of Assessment or other correspondence from Revenue.
• Preliminary tax records: Proof of any preliminary tax already paid through ROS, myAccount or direct debit.

2. Income Records

PAYE income

Your Employment Detail Summary, accessible via myAccount.

Details of any Benefit-in-Kind, such as a company car or health insurance paid by an employer.

Self-employed

Full-year accounts or profit and loss statement.

3. Expenses and deductions

• Business expense receipts and invoices.
• Receipts for other expenses such as medical or rent.

4. Financial statements

• Full-year bank statements for all business or mixed-use bank accounts.

• Credit card statements used for business purchases.

• Loan or finance agreements tied to the business.

• Payment platform statements (e.g., Stripe, PayPal, Etsy, Revolut) showing gross sales and transaction fees.

• Records of any grants, subsidies, or cash payments received.

• If you’re registered for VAT: copies of your VAT3 returns and supporting VAT records.

Tips to make the process as smooth as possible

Keep on top of records throughout the year

Recording transactions regularly and accurately can make preparing your accounts and tax return much easier.

Avoid paying your tax liability in one large lump sum

You can pay your preliminary income tax throughout the year—either by setting up a monthly direct debit arrangement via ROS or by making ad hoc payments throughout the year.

Don’t wait until the last minute to Pay and File

Giving yourself more time means you can deal with missing information or unexpected issues before the self-assessment deadline.

Use Revenue’s Receipts Tracker service

You can upload eligible receipt details and images through the Receipts Tracker service in myAccount or ROS.

If the images are clear, readable and complete, you don’t need to keep the original receipts.

PAYE taxpayers can claim certain credits in real time through myAccount.

You’ll need a MED 2 form for non-routine dental claims.

Don’t miss out on previous years’ tax reliefs

If you’ve missed a tax relief or credit in a previous year, it’s not necessarily too late.

You can generally go back up to four years, but you’ll need to complete the return for each relevant year through myAccount or ROS.

In 2026, this generally covers the 2022 to 2025 tax years.

Don’t add a previous-year claim to the current-year return. Select and complete the return for the relevant year instead.

Common errors

Don’t throw out or delete your documentation

You generally need to keep the records supporting your tax return for six years from the end of the tax year they relate to, unless Revenue allows you to keep an accepted digital copy instead.

Self-employed business owners cannot claim mileage and overnight allowances at civil service rates

This is only available to employees.

Keep enough evidence to support every expense or deduction you claim.

If you are registered for VAT

If you’re VAT-registered and can reclaim the VAT on a purchase, claim the expense without that VAT.

If the VAT isn’t recoverable, it may form part of the cost.

Check Revenue’s guidance or ask your tax adviser if you’re unsure.

Final thoughts

Preparing early gives you time to organise your records, check the reliefs and expenses you may be entitled to claim, and correct any mistakes before you file.

 Start gathering what you need now so you’re ready well before the deadline.

Niall agrees: “Whether you choose to complete your return yourself or seek professional advice, staying organised and informed will give you greater confidence in managing your tax affairs and help you stay on top of your financial responsibilities.”

Frequently asked questions about filing your tax return

What tax form do I fill?

• Form 11: If you’re self-employed or otherwise fall within Revenue’s self-assessment rules, you’ll generally need to file Form 11. PAYE taxpayers who meet Revenue’s non-PAYE income thresholds may also need to register for self-assessment.
• myAccount: If you’re a PAYE taxpayer and don’t need to enter self-assessment, you may be able to declare other income and claim eligible credits or reliefs through myAccount.

When is the tax return deadline?

• ROS: If you file your 2025 Form 11 and make the required payment through ROS, you have until Wednesday 18 November 2026. This covers the 2025 balance and 2026 preliminary tax.
• Standard deadline: The standard Pay and File deadline was 31 October 2026. The ROS extension doesn’t apply if you file or pay another way.

What expenses can I claim?

• Business expenses: Must be incurred wholly and exclusively for the purpose of your trade.
• Personal tax credits and reliefs: These may include qualifying medical expenses, third-level tuition fees and the Rent Tax Credit.
• Capital allowances: You may be able to claim these for qualifying business assets. Rates and restrictions vary by asset type, so check Revenue’s guidance.

How far back can I claim tax refunds?

You can claim a tax refunds up to four years in the past.

Complete the return for each relevant year through myAccount or ROS.

In 2026, this generally covers 2022 to 2025.

Can I correct my tax return after submitting it?

Yes.

If you discover an error after filing your Form 11 through ROS, you can amend the return.

Correct mistakes as soon as possible and check whether the amendment changes the amount of tax you owe.

How long should I keep my tax records?

If you run a business, you generally need to keep the records used to calculate your tax returns for six years from the end of the tax year they relate to.

Revenue allows some records to be stored digitally, including eligible receipts uploaded through its Receipts Tracker.

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