?>
By Introduction
R&D tax credits have long been one of the most generous reliefs available to UK small businesses — and one of the most misunderstood. But the landscape changed dramatically from April 2024, when HMRC merged the long-standing SME R&D scheme and the Research and Development Expenditure Credit (RDEC) into a single merged scheme.
For many SMEs, the reforms came as a shock. Rates changed, qualifying criteria tightened, and the administrative requirements became significantly more demanding. If your business has been claiming R&D relief — or has been wondering whether it qualifies — this guide explains exactly where things stand in 2026.
What Is R&D Tax Relief and Why Does It Exist?
R&D tax credits are a government incentive designed to encourage UK businesses to invest in innovation. If your company carries out qualifying research and development activities, you can claim a reduction in your Corporation Tax bill or, in some circumstances, receive a cash repayment from HMRC — even if you made a loss.
The relief exists because innovation is expensive and risky, and the government wants to encourage UK businesses to invest in it rather than buy off-the-shelf solutions from overseas.
The Merged Scheme — What Changed in April 2024
Prior to April 2024, UK businesses could claim under either the SME R&D scheme (more generous rates, available to smaller companies) or RDEC (available to large companies and SMEs in certain circumstances). From April 1 2024, these were replaced by a single merged scheme with a uniform rate of 20% above-the-line credit for most companies.
There is one significant exception: loss-making SMEs that are considered R&D intensive — meaning their qualifying R&D expenditure represents 30% or more of their total expenditure — can still claim under an enhanced scheme with a notional tax credit of 27%. This is known as the Enhanced R&D Intensive Support (ERIS) scheme.
For profitable SMEs that were previously claiming under the old SME scheme (which offered a 130% super-deduction on qualifying costs), the effective value of the relief has reduced. This is the most significant practical impact of the reform for many SMEs.
What Qualifies as R&D Under the New Rules?
The definition of qualifying R&D has not fundamentally changed, but HMRC has significantly tightened how it reviews claims. Qualifying R&D must:
- Seek to achieve an advance in science or technology — not just in your own knowledge, but objectively in the field
- Involve a genuine scientific or technological uncertainty that a competent professional in the field could not resolve without experimentation
- Involve systematic investigation or experimentation — trial and error, prototyping, iterative development
Crucially, the advance does not have to succeed. Failed R&D projects can still qualify — provided the uncertainty and the systematic investigation genuinely existed.
Activities that do not qualify include: routine software maintenance, applying established techniques to new products, market research, and quality control processes.
What Costs Can You Include in Your Claim?
Qualifying expenditure under the merged scheme includes:
- Staff costs: salaries, employer National Insurance, and pension contributions for employees directly engaged in R&D (and a proportion for supervisory staff)
- Subcontractor costs: payments to third parties carrying out R&D on your behalf (now subject to a 65% cap on qualifying subcontractor costs in some cases)
- Materials and consumables used in the R&D process
- Cloud computing and data costs directly attributable to R&D activity
- A proportion of software licence costs
Staff costs typically form the largest component of most SME R&D claims and are often underestimated — particularly where employees divide their time between R&D and non-R&D activities.
The New Administrative Requirements You Cannot Ignore
HMRC has significantly increased scrutiny of R&D claims in response to widespread abuse of the old schemes. Under the current rules:
- All companies making an R&D claim for the first time must notify HMRC in advance using a Claim Notification Form — failure to do this before the deadline makes the claim invalid
- Claims must be accompanied by an Additional Information Form (AIF) with a detailed technical narrative describing the R&D project, the advance sought, the uncertainty encountered, and how it was addressed
- HMRC now routinely opens enquiries into R&D claims — having a well-documented technical and financial narrative is no longer optional
Important: HMRC has publicly stated that it considers many agent-led R&D claims to be inaccurate or fraudulent. Using a reputable accountant who understands both the technical and tax aspects of R&D — rather than a specialist R&D claims firm operating on a pure contingency basis — significantly reduces your enquiry risk.
Common Mistakes That Get Claims Rejected
- Claiming for activities that represent routine product improvement rather than genuine technological uncertainty
- Including all staff costs without apportioning for time spent outside R&D activities
- Missing the Claim Notification Form deadline for first-time claimants
- Submitting a thin or generic technical narrative that does not describe the actual uncertainty resolved
- Overclaiming subcontractor costs beyond the allowable threshold
Is It Still Worth Claiming?
Yes — for most innovative SMEs, R&D tax credits remain one of the most valuable reliefs available. A profitable SME spending £200,000 on qualifying R&D staff costs can reduce its Corporation Tax bill by £40,000 under the merged scheme. For loss-making R&D-intensive SMEs, the ERIS cash credit can be significant.
The key is to claim correctly, document thoroughly, and work with an adviser who understands HMRC’s current expectations. The era of loose, retrospective claims built around inflated staff hours is over — but for businesses doing genuine innovation, the relief remains highly valuable.
Next Steps
If your business is investing in new technology, software, processes, or products and you have not yet explored R&D tax credits — or if you have been claiming and want to ensure your claims are defensible under HMRC’s current approach — speak to our team. We can assess your eligibility, calculate your potential claim, and prepare a fully documented submission that stands up to scrutiny.
