R&D Tax Credit

You started a company to solve a problem nobody else had cracked. Now you're spending money on developers, prototypes and failed experiments, and the runway is shrinking faster than you'd like. Here's the part most new founders miss: the Irish research and development tax credit can hand a meaningful chunk of that spend back to you, even if you haven't paid a cent of corporation tax yet.

This guide explains how the R&D tax credit works, who qualifies, what costs count, and how to make a claim that stands up to Revenue scrutiny. It sits alongside our broader guide to business taxes in Ireland, which covers the rest of your obligations as a new owner.

What is Ireland's R&D tax credit and why should new business owners care?

The R&D tax credit is a corporation tax incentive that rewards companies for carrying out qualifying research and development activities in Ireland or the European Economic Area. For accounting periods beginning on or after 1 January 2026, the tax credit rate is 35% of qualifying R&D expenditure, following the increase announced in Budget 2026. Spend €100,000 on eligible R&D work and you get €35,000 back.

That sits on top of the normal corporation tax deduction you already get for the same costs. Because R&D spend is usually deductible at the 12.5% trading rate of corporation tax, the combined effective tax deduction is one of the most generous in Europe. Few parts of Irish tax legislation are this kind to early-stage companies.

Why does this matter to you specifically as a new owner? Three reasons:

• The credit is payable in cash. You don't need a corporation tax bill to benefit, which makes it genuinely useful for pre-profit startups burning through investment.
• Smaller claims are paid faster. A claim of €87,500 or less is now paid in full in the first year, so the money lands while you still need it.
• It compounds with other supports. The credit sits comfortably alongside grants for businesses in Ireland and equity reliefs like the SURE scheme, provided you don't claim twice on the same euro of spend.

Who is eligible to claim the R&D tax credit in Ireland?

Eligibility is assessed at company level, and the bar is lower than many founders assume. Broadly, your company can claim the credit if it meets all of the following conditions set out in Revenue's R&D Corporation Tax Credit guidance:

• It is within the charge to Irish corporation tax and carries on a trade.
• It undertakes qualifying R&D activities in Ireland, the EEA or the UK.
• The expenditure does not qualify for a tax deduction or relief in another country.

Notice what's missing from that list. There's no minimum size, no minimum spend, and no requirement to be profitable. A two-person software company that registered with the Companies Registration Office six months ago can be just as eligible for R&D tax credits as a multinational with a dedicated R&D manager. If you're still at the formation stage, our guide to setting up a company in Ireland walks through the groundwork.

One misunderstanding to avoid: innovation is not the same thing as R&D. Launching a clever product, entering a new market or building a slick app on standard tools might be innovative in the commercial sense, but it only qualifies for the R&D tax credit if it involves genuine scientific or technological uncertainty. Sole traders are also out of luck; the credit applies to companies only.

What counts as qualifying R&D activity under Irish rules?

To qualify for the R&D tax credit, your project must satisfy three tests. The research and development activities must be:

• Systematic, investigative or experimental in a field of science or technology.
• Seeking to achieve a scientific or technological advancement, not just an advance for your own company.
• Aimed at resolving a scientific or technological uncertainty that a competent professional in the field could not readily resolve.

The work can be basic research, applied research or experimental development. In practice, most startup claims fall into the last category: building and testing something where the outcome genuinely wasn't certain at the start.

What does that look like day to day? A software company rearchitecting a system to handle a tenfold increase in concurrent users, where existing approaches demonstrably failed, is a credible R&D project. So is an engineering firm running iterative prototypes to overcome a materials constraint, or a food producer running structured trials to achieve a shelf life that standard methods couldn't deliver. The common thread is experimentation with a real chance of failure.

Plenty of activities sit outside the net, however useful they are commercially. Routine software updates, cosmetic changes, configuring off-the-shelf systems, market research, and standard quality control do not count as qualifying R&D activities. Claiming them is the fastest way to attract an enquiry.

What does scientific or technological uncertainty mean in practice?

Revenue expects to see evidence that your team faced a problem with no readily available solution. Not "we hadn't done this before", but "nobody in the field could tell us with confidence how to do this". The distinction matters because Revenue can, and does, bring in independent technical experts to assess claims.

The strongest evidence is contemporaneous: hypotheses you recorded before testing, iterations that failed, design decisions you reversed, and the technical reasoning behind each pivot. A project that worked perfectly first time, with no documented dead ends, is hard to defend as resolving uncertainty.

What R&D costs and expenditure qualify for the credit?

Once your activities pass the qualifying tests, you can include the expenditure on R&D that relates directly to them. The main categories of qualifying R&D expenditure are:

• Staff costs, apportioned to the time each person actually spent on R&D work. If your lead developer spent 60% of the year on a qualifying R&D project, 60% of their employment costs can go into the claim.
• Materials and consumables used up in the R&D process, such as prototype components or cloud computing consumed by experiments.
• Overheads incurred wholly and exclusively in carrying on the R&D, on a reasonable apportionment basis.
• Subcontracted R&D costs, within limits. Payments to unconnected third parties are broadly capped at the greater of 15% of your in-house R&D expenditure or €100,000, and payments to universities at the greater of 5% or €100,000.

What doesn't qualify? Sales and marketing, routine testing, standard staff training, distribution, and general administration. The credit is tied to the experimental work itself, not the business activity around it.

Do building costs qualify for the R&D tax credit?

Sometimes, under a separate strand of the relief. Where you build or refurbish a building and at least 35% of it is used for qualifying R&D over a defined period, a credit is available on a proportionate share of the construction cost. The conditions are technical and clawbacks apply if the building's use changes, so this is one area where you should involve a tax advisor before committing to the spend. Keep records showing exactly how the space is used and by whom.

How much is the R&D tax credit worth and how do you calculate it?

The rate depends on when your accounting period begins, because the regime has been improved twice in recent years:

Accounting period commencing	R&D tax credit rate
Before 1 January 2024	25%
On or after 1 January 2024	30%
On or after 1 January 2026	35%

The calculation itself follows a logical sequence. Identify the projects that meet the qualifying tests, map your costs to those projects, apportion staff time and shared overheads on a defensible basis, and apply the tax credit rate to the total.

A worked example. Suppose your startup's accounting period began in January 2026 and you incurred the following on a qualifying R&D project:

• €90,000 of apportioned payroll for two engineers.
• €15,000 paid to an unconnected specialist contractor, inside the 15% and €100,000 limits.
• €10,000 of consumables and cloud infrastructure consumed in testing.

Total qualifying spend: €115,000. At 35%, the credit claimed is €40,250. Because that figure is under the €87,500 threshold, you'd receive the full credit in year one rather than waiting for instalments. On top of the corporation tax deduction for the same costs, that is a serious dent in your net R&D costs.

One caution. Rates, thresholds and payment mechanics shift with each Finance Act, and tax legislation rarely stands still for long. Check the current rules at the time you file, or ask someone who tracks them for a living.

How is the credit paid out if you're not yet profitable?

This is where Ireland's R&D regime stands apart from a simple tax relief. When you make a claim, you elect how each instalment is handled: it can be offset against your corporation tax liabilities, or treated as an overpayment of tax and repaid to you in cash. No profits? You still get paid.

The credit is paid in up to three annual instalments. The first instalment is the greater of €87,500 or half the credit, the second is three fifths of what remains, and the third is the balance. For accounting periods beginning before 1 January 2026 the first-year threshold was €75,000, so the Budget 2026 change means smaller R&D projects now see their full credit arrive faster.

In practical terms, a claim of €87,500 or less is paid in full in year one. Larger claims stretch over roughly 33 months from filing. Build that timing into your cash flow forecast rather than treating the credit as instant money; Revenue processing and any follow-up queries add their own weeks to the clock.

How do you claim the R&D tax credit in Ireland, step by step?

The claim is made through your corporation tax return, the Form CT1, filed via the Revenue Online Service (ROS). The deadline is strict: you must claim within 12 months of the end of the accounting period in which the R&D activities took place and the expenditure was incurred. Miss it and the credit for that year is gone for good.

Here's the process in order:

1. Confirm which projects meet the science and uncertainty tests, and rule out the ones that don't.
2. Prepare a technical narrative for each R&D project: the advancement sought, the uncertainties faced, and the experimentation carried out.
3. Compile cost schedules showing how payroll, consumables and subcontractor costs were apportioned to each project.
4. Complete the R&D section of the CT1 and make your payment or offset election. If filing returns isn't your idea of a good evening, our tax return services handle the CT1 end to end.
5. Retain every piece of supporting documentation. Revenue can review a claim up to four years after the end of the accounting period.

The mistakes that delay or sink claims are predictable: vague project definitions, no time records for staff, narratives written two years after the work, and costs that can't be traced to a specific project. All four are avoidable if you set up your records before the year ends rather than after.

What documentation does Revenue expect, and how do you stay audit ready?

Revenue audits of R&D claims focus on two questions. Was the activity genuinely qualifying R&D? And are the costs claimed properly substantiated? Your documentation needs to answer both without scrambling.

On the technical side, keep:

1. Project descriptions written at the time, covering objectives, hypotheses and the uncertainty being tackled.
2. Records of experiments, test results, failed iterations and what each failure taught the team.
3. Version histories, design documents and meeting notes that show the work was systematic rather than ad hoc.

On the financial side, keep payroll records, timesheets or credible time apportionments, supplier invoices, and the workings behind every allocation. A simple decision log showing who approved each R&D project and when adds credibility for very little effort. Structure the lot per project, so that when a Revenue query arrives you can answer it in days, not months.

And resist the temptation to round up. Overclaiming routine development work is the most common red flag, and the penalties and interest on a clawed-back credit hurt far more than a slightly smaller claim would have.

What else do new business owners ask about the R&D tax credit?

Do I need to be profitable to claim the R&D tax credit?

No. The credit is available as a payable credit, so a company with little or no corporation tax liability can elect to receive it as a cash repayment in instalments. For many pre-revenue startups the repayment is worth more than the tax saving would be.

My R&D is software. Does it still qualify?

Yes, if it clears the uncertainty bar. Writing code is not automatically R&D, but resolving a genuine technological uncertainty through code is. Building a recommendation engine where published approaches couldn't meet your latency constraints could qualify; integrating a payment API by following its documentation will not.

Can I claim for subcontracted or outsourced R&D work?

You can, within limits. Payments to unconnected subcontractors are broadly capped at the greater of 15% of your in-house qualifying spend or €100,000, with a 5% equivalent for universities, and the subcontractor must not claim the credit on the same work. Document what was outsourced and why, because Revenue looks closely at these costs.

What is the 80% rule for R&D credit?

It's an American concept, not an Irish one. Under the US federal credit, an employee who spends at least 80% of their time on qualified research can have 100% of their wages counted. Ireland has no equivalent shortcut; you claim the actual proportion of time each person spent on qualifying R&D, supported by time records.

What records should I keep from day one?

A lightweight stack is enough: dated project briefs stating the uncertainty, a running log of experiments and failures, timesheets or weekly time estimates per person per project, and tagged invoices for R&D costs. An hour a week of discipline now saves a painful reconstruction at the end of the accounting period.

How long does it take to receive the money after I file?

Straightforward claims are typically processed within months of filing the CT1, with the first instalment following your election. Queries, missing documentation or an expert review can stretch the timeline considerably, which is another argument for getting the paperwork right first time.

Want help checking your eligibility and preparing your claim?

The R&D tax credit rewards exactly the kind of company Ireland's corporate tax system wants to attract: small, ambitious and building something new. The money is real, the credit is available to pre-profit companies, and the 35% rate makes 2026 the best year yet to claim. What kills claims isn't eligibility; it's weak documentation and missed deadlines.

First Accounts works with startups and SMEs across Ireland on exactly this: reviewing whether your projects qualify, scoping the costs, preparing the claim and building an audit-ready documentation pack. If your engineers are doing the hard work anyway, you may as well be paid for it. Book a consultation and get in touch today.

For wider supports, Enterprise Ireland and your Local Enterprise Office fund R&D and innovation in ways that complement the credit, and the Department of Enterprise publishes the policy behind the regime. Worth twenty minutes of reading before your next board meeting.

Disclaimer: This guide is for general information purposes only and does not constitute professional advice. Speak to a qualified accountant about your specific circumstances before acting on anything covered here.