Every year, we speak to business owners and finance teams who are surprised to learn their R&D tax credit claim is at risk. This isn’t because their projects don't qualify, but because they can't evidence them properly.
Ireland's R&D tax credit is generous (currently 30% back on R&D expenditure) but claiming it confidently means being able to back it up if Revenue comes knocking. If Revenue raises an aspect query, your claim lives or dies on your documentation.
What does Revenue expect from claimants?
Revenue is clear on that documentation is necessary for a compliant claim. Their guidance states:
“It is expected that activities will be undertaken in a planned logical sequence – generally to a recognised methodology – with detailed records being maintained. It is important that the claimant is able to provide records and details of the activities carried on, not just the outcomes.
It is necessary for companies to document and be in a position to present evidence of qualifying activities, including dated documents of the original scientific or technological goals of the activity; the progress of the work; how it was carried out, and any conclusions arrived at.”
In plain terms: it’s not enough to show that your R&D produced a result. You need to show how it was carried out, and that you kept records along the way.
What evidence does Revenue require?
When Revenue reviews a claim, they're applying two tests: a science test and an accounting test. Each requires a different type of documentation.
Technical Justification (the Science Test)
This is where you demonstrate that the work actually qualifies as R&D under Irish law. Revenue needs to see that you were seeking a scientific or technological advance, not simply applying existing knowledge.
Your technical evidence might include:
- Timesheets showing which staff worked on qualifying projects
- Competitor analyses or literature reviews showing the solution wasn’t already in the public domain
- Technical specifications, experiment logs, and associated results
- Project plans, milestone reports, and progress logs
- Staff CVs or qualifications demonstrating relevant expertise
- Internal communications discussing technical challenges and decisions
The records you keep need not be created specifically for your claim. Your existing documentation methods may well be enough, especially in industries with high regulatory requirements. Contemporaneous records (kept at the time, not reconstructed later) are always preferable.
The depth of evidence expected is proportionate to the size of your claim. A large pharma company with a seven-figure claim will need detailed, robust documentation. A smaller business making incremental improvements to technology may have a lighter evidential footprint, but it still needs to exist.
There is one notable exception: if your project was funded by Enterprise Ireland, Horizon Europe, or the IDA, Revenue generally accepts that the work meets the definition of R&D. This is because these bodies apply their own qualifying criteria before awarding funding which Revenue agrees meets their definition.
Financial justification (the Accounting Test)
This test ensures that the costs you’re claiming were actually incurred in the relevant accounting period, are eligible costs under the scheme, and have been allocated correctly.
You’ll want to keep:
- Timesheets and payslips for staff whose time is included in the claim
- Invoices and contracts for subcontractors, with descriptions of the qualifying work they performed
- Invoices and receipts for qualifying software or consumable items
- A clear methodology for how costs were apportioned between R&D and non-R&D activity
Apportionment methodologies will vary by cost type. For staff, timesheets are the most defensible approach. For overhead costs, you might apply the ratio of R&D staff to total staff. For software, it might be the number of licences used by the R&D team. Whatever method you use, it needs to be clearly documented and consistently applied across that cost category.
Why does good record-keeping matter?
Most businesses think of documentation as a defensive measure, or something you pull together if Revenue asks questions. But there are three practical reasons to build good habits from day one:
- It makes the claim easier to prepare. The deadline for R&D tax credits is 12 months after the end of your accounting period. That can mean you’re claiming for work done up to two years ago. If you’re relying on memory, you’ll miss things. Good records mean a faster, more accurate claim.
- It protects you from overclaiming. Including costs that don’t qualify, even unintentionally, can result in claw-backs and, in serious cases, penalties. Clear documentation keeps you honest.
- It prevents underclaiming. Without a record of all qualifying activity, it’s easy to leave legitimate costs unclaimed. For many businesses, this could amount to thousands of euros of missed relief every year.
How can Tax Cloud help?
Tax Cloud Ireland is built for SMEs that want to claim confidently without the cost of a full consultancy. Our platform walks you through identifying qualifying projects, capturing the right evidence, and building a compliant claim with expert support at every stage.
Whether you’re preparing your first claim or looking to tighten up your existing process, getting your documentation right is the single most important thing you can do.
If you’d like to see how Tax Cloud Ireland can help you build a robust, audit-ready claim, get in touch with our team today.
