Common R&D claim mistakes and how to avoid them
The same handful of errors appear in weak claims in every jurisdiction. Most are avoidable with a little structure. Here are the ones that matter, why they matter, and what to do instead.
Tax authorities in the countries we cover publish what they find when they review R&D claims, and the pattern is consistent. Claims rarely fail because the law was misread in some subtle way. They fail for ordinary reasons: the project was not really R&D, the evidence was not kept, the numbers were built backwards from a target, or a deadline was missed. Each of those is avoidable.
1. Claiming the whole project instead of the uncertain part
A software product, a new production line or a building design may contain genuine R&D, but the R&D is usually a fraction of the whole. Claiming every hour on the project because "the project was innovative" is the most common way to overstate a claim. Identify the specific technical uncertainty, draw a boundary around the work that addressed it, and claim that.
2. Routine work presented as development
Installing and configuring purchased systems, applying known techniques to a new customer, testing for quality control, and cosmetic redesign do not qualify anywhere, however skilled the people doing them. The test is whether a competent professional in the field would have known how to do it. If yes, it is not R&D, even if it was hard work.
3. Reconstructing uncertainty after success
Once a problem is solved it looks obvious, and a narrative written at year end tends to describe the solution rather than the uncertainty. Reviewers read hundreds of these and recognise them instantly. The fix is a dated note at project start (see our guide to documenting R&D as you go).
4. No time records
Staff costs are the largest part of most claims and the easiest to challenge. A percentage assigned in hindsight with no supporting record is a common cause of reductions under review. Monthly allocation signed by a team lead is enough; annual guesses are not.
5. Building the numbers backwards
Deciding the target credit first and then finding costs to fit it produces claims that do not reconcile to the ledger and cannot be defended line by line. Start from the general ledger and payroll, allocate to projects, and let the credit be whatever it is.
6. Missing an administrative deadline
Every scheme has hard deadlines, and several have added new ones in recent years. Missing one can void an otherwise sound claim.
- United Kingdom: claim notification for new claimants within six months of the period end, and the Additional Information Form before the return.
- Australia: registration with AusIndustry within ten months of the end of the income year.
- Canada: Form T661 within eighteen months of the tax year end.
- United States: refund claims must meet the specific information requirements and be filed within the limitation period.
7. Subcontractor and overseas costs claimed without checking the rules
Rules on who can claim contracted-out work, how much of a subcontractor payment qualifies, and whether overseas work counts differ sharply between countries and have changed recently in the UK. Assume nothing carries over from one jurisdiction to another.
8. Nobody technical reviewed the claim
Claims written entirely by finance or by an external advisor without sign-off from the people who did the work contain errors the technical team would have spotted in minutes. Build a fifteen-minute review with the technical lead into the process.
9. Treating the advisor's fee as the only cost
A claim that is reduced under review costs interest, possibly penalties, and weeks of management time. A cheaper or larger claim is not a better one. Understand the fee structure you are being offered and what it rewards; the independent guidance at knowyourfees.org is a good starting point.
What to do instead
Boundary the uncertainty, date the evidence, allocate time monthly, reconcile costs to the ledger, put deadlines in the finance calendar, and have the technical lead sign off. None of this is difficult. It is simply a process, and the claims that survive review are the ones that had one.
Educational material, not advice. Confirm the current requirements with the relevant authority or a qualified adviser.
Educational content only, not tax advice. Rules change and eligibility depends on your circumstances, so check the official guidance or speak to a qualified advisor before you claim. See the disclaimer.