One of the most consistent findings from annual reviews I carry out with new clients is that they have been paying more tax than they needed to. Not because they were doing anything dishonest. Not because their previous arrangements were fraudulent. Simply because nobody ever sat down with them and walked through every relief they were entitled to claim.
Revenue operates a self-assessment system. It is not Revenue’s job to remind you of reliefs you haven’t claimed. The burden is on the taxpayer — and on their accountant — to identify what is available and to claim it.
These are the ten reliefs that come up most often as unclaimed in the businesses I review.
1. Pension Contributions — The Most Valuable Relief Available
Contributions to a personal pension, PRSA, or occupational pension scheme attract income tax relief at your marginal rate — 40% for a higher-rate taxpayer. This means every €1,000 you contribute to a pension costs you €600 after tax relief. The money grows in the pension fund without being subject to income tax, CGT, or DIRT until you draw it down in retirement.
The relief is subject to age-related limits as a percentage of your net relevant earnings:
Under 30: 15% of net relevant earnings. Age 30–39: 20%. Age 40–49: 25%. Age 50–54: 30%. Age 55–59: 35%. Age 60 and over: 40%.
There is also an annual earnings cap of €115,000 — contributions on earnings above this figure do not attract relief.
The number of self-employed people and company directors who are not maximising their pension contributions — and therefore not claiming significant tax relief — is striking. If you are approaching retirement age and have significant income, the pension contribution calculation alone can reduce a tax bill by tens of thousands of euros per year.
2. The Small Benefit Exemption (Shop Local Vouchers)
As I noted in my Budget 2026 analysis, the Small Benefit Exemption now allows employers to provide up to €1,500 in non-cash benefits to employees per year, across up to five occasions, free of PAYE, PRSI, and USC.
This is equally available to owner-directors who pay themselves a salary through their company. A director who operates through a limited company can give themselves up to €1,500 per year in vouchers or non-cash benefits through the company, in addition to their salary, with no income tax liability. On top of salary, this is a genuinely useful enhancement to the overall remuneration package.
3. Home Office Expenses
If you work from home — whether as a sole trader or as a company director doing administration from home — a proportion of your household running costs is deductible against your business income.
The deductible proportion is based on the percentage of the home used for business and the time it is used for business purposes. Eligible costs include electricity, heating, broadband, and mortgage interest (or rent if renting). The apportionment should be reasonable and documented.
The caveats: as noted in my earlier article on tradespeople’s expenses, claiming home office costs can affect the principal private residence CGT exemption on a future sale of the home. This needs to be weighed against the benefit of the relief each year.
4. Motor Expenses — Beyond the Obvious
Most business owners claim fuel. Fewer claim the full range of motor-related expenses they are entitled to. Depending on the type of vehicle, the usage split, and the cost, the deductible amount can extend to:
Road tax and insurance (business proportion). Servicing, maintenance, and repairs. Parking (on business trips — not at a regular place of work). Tolls on business journeys. Capital allowances on the vehicle purchase cost (for commercial vehicles, 12.5% per year; for cars, subject to CO2-related caps).
The requirement in all cases is to be able to demonstrate the business usage. A mileage log is not optional if you are claiming motor expenses on an apportioned basis — it is the evidence that supports the claim.
5. Professional Subscriptions and Memberships
Annual membership of a professional body — the Institute of Chartered Accountants, the Law Society, the RIAI, a trade association — is deductible if membership is relevant to your trade or profession. So are any journals, industry publications, or professional development resources.
Memberships of networking groups — chambers of commerce, industry associations, business networks — are also generally deductible, provided they are genuinely business-oriented rather than primarily social.
6. Training and Professional Development
Costs incurred in training yourself or your employees to maintain or improve skills relevant to your current trade are deductible. This includes:
CPD (continuing professional development) courses. Industry training qualifications. Online courses relevant to your business. Conference fees and attendance costs (not the entertainment element).
Note that training costs for skills in a completely new trade — training to qualify in a profession you are not currently practising — are not deductible. But anything maintaining or extending your existing professional competence is in scope.
7. Retirement Relief — A Major CGT Planning Opportunity
When a business owner eventually sells their business, the gain on that sale is subject to Capital Gains Tax at 33%. As I explain in my plain-English guide to Capital Gains Tax in Ireland, Retirement Relief under Section 598 of the Taxes Consolidation Act 1997 can reduce or eliminate the CGT payable on the disposal of qualifying business assets.
For disposals to a child, the relief is very generous — potentially complete exemption from CGT regardless of the value of the assets, subject to conditions.
For disposals to a third party (selling the business to someone other than a family member), Retirement Relief provides full exemption on gains up to a threshold (currently €750,000 for individuals aged 55–65; reduced exemption for those aged 66 and over). Gains above the threshold are chargeable at 33%.
This relief requires long-term planning. The conditions — regarding ownership period, active participation in the business, and the nature of the assets — take years to satisfy. Business owners who want to eventually sell their business and benefit from Retirement Relief need to ensure they have structured their affairs to meet the qualifying conditions well in advance of any planned exit.
8. The Earned Income Tax Credit
Self-employed individuals and proprietary directors in Ireland are entitled to the Earned Income Tax Credit — currently €1,775 per year. This directly reduces your income tax bill.
It sounds basic, but I review income tax returns from time to time where this credit has not been correctly applied. On a standalone basis, €1,775 is not enormous. But unclaimed over five years, that is €8,875 of unnecessary tax paid.
Always verify that all applicable credits — Earned Income Credit, Personal Credit, Age Credit, Home Carer Credit where applicable — are being claimed on your return.
9. Research and Development (R&D) Tax Credit
The R&D Tax Credit is available to Irish companies that carry out qualifying research and development activities. The credit is 30% of qualifying R&D expenditure — meaning that for every €100,000 spent on qualifying R&D, the company can claim €30,000 off its corporation tax bill.
This is dramatically underused by Irish SMEs, largely because business owners assume R&D tax credits are only for technology companies or laboratories. In practice, qualifying R&D includes any systematic investigation or experimentation to achieve scientific or technological advancement — which can include product development, process improvement, software development, and a range of other activities in manufacturing, construction, food production, and beyond.
If your business is investing in developing new products, improving processes, or solving technical problems that are not routine, it is worth having your R&D expenditure assessed for qualification. The potential credit is substantial.
10. Capital Allowances on Equipment and Machinery
The full range of capital allowances available on business assets is frequently underutilised. Many business owners deduct the purchase price of small items in the year of purchase but neglect to claim capital allowances systematically on longer-life assets.
Capital allowances are available at 12.5% per year over eight years on qualifying plant and machinery, commercial vehicles, computers, and other business equipment. On a significant equipment purchase — a van, specialist tools, manufacturing equipment, IT systems — the annual capital allowance can be a meaningful deduction.
If you have purchased assets in the last several years and have not been systematically claiming capital allowances on them, a catch-up review may identify unclaimed deductions. Revenue allows capital allowances to be claimed in arrears (subject to time limits) where they have not been claimed in previous years.
The Pattern Behind These Missed Claims
The common thread running through all ten of these reliefs is documentation and awareness. Revenue does not flag these to you. Your accountant cannot claim them if they don’t know you have incurred the relevant expenditure. The mechanism for capturing them is a proper record-keeping system, a good working relationship with your accountant, and an annual review — ideally timed well ahead of the deadlines listed in our Irish tax calendar for 2026 — that goes beyond simply accepting last year’s return as a template for this year.
If you have not had a proper tax review in the last two years, you should. The cost of the review is almost always less than the tax savings it identifies. You can find more articles like this across our taxation guides.
Paddy Malone FCA AITI
Paddy is the principal of Malone & Co. Chartered Accountants in Dundalk. A Fellow of Chartered Accountants Ireland and a Chartered Tax Consultant with the Irish Tax Institute, he has been advising businesses across County Louth and the North-East for over 35 years.