R&D Tax Credits for Startups: Getting Your First Claim Right

Startups are HMRC's ideal R&D claimant. You're burning cash on technical problems, you're loss-making, and you probably have no idea you can get a significant chunk of that cash back. The R&D tax relief system exists precisely to de-risk early-stage innovation — but most startups either miss it entirely or claim far less than they're entitled to.

Key fact: Loss-making R&D-intensive SMEs can receive a cash payment worth up to 27% of qualifying R&D spend under the Enhanced R&D Intensive Support (ERIS) scheme, even when paying zero Corporation Tax.

Why Startups Are Well-Placed to Claim

The R&D tax credit scheme under CTA 2009 s.1038 rewards companies attempting to advance science or technology while resolving genuine technological uncertainty. That describes the first two years of most tech startups almost perfectly.

Building an MVP that doesn't yet exist? Solving infrastructure challenges at scale? Developing a novel algorithm? All potentially qualifying. The test isn't whether you called it "R&D" — it's whether you faced technical problems that couldn't be solved by simply looking up the answer.

What makes startups particularly valuable claimants under the current rules: the ERIS scheme. If your R&D spend represents 30% or more of your total company expenditure (a threshold most early-stage companies easily clear), you qualify for enhanced rates. Under ERIS, loss-making startups receive a cash payment of 27p for every £1 of qualifying R&D spend — that's a 27% cash benefit, not a tax saving.

Translation: if you spent £300,000 building your product last year and it was mostly salaries for engineers, you could get £81,000 back in cash from HMRC. No invoice required. No product sales. No profit needed.

What Qualifies as R&D for a Startup?

The HMRC CIRD Manual at CIRD81000 sets out the framework. For software and tech startups, qualifying activities typically include:

• Developing novel technical approaches where existing solutions didn't exist or were inadequate for your use case
• Solving scalability, performance or reliability challenges that required original technical work
• Building bespoke infrastructure, APIs or data processing pipelines that involved technical unknowns
• Machine learning and AI development where the technical outcome was uncertain
• Integration work where combining systems created genuine technical complexity

For hardware or deep tech startups:

• Prototyping new physical products or components
• Materials selection and testing under conditions not documented in existing literature
• Miniaturisation, power optimisation or form-factor challenges with no established solutions

What doesn't qualify: standard website development, off-the-shelf software configuration, UX design, marketing activities, or work where you were following a known methodology to a predictable outcome.

The Costs You Can Claim

Most startup costs fall neatly into qualifying categories. Staff salaries are the big one — including employer's NIC and pension contributions for employees spending time on qualifying R&D. You don't need a separate R&D department; your founding engineers almost certainly qualify for significant portions of their time.

Subcontractors count at 65% of the qualifying element — relevant if you're using freelance engineers or development agencies on specific technical work. Cloud computing costs and data licences are qualifying from 1 April 2023.

One thing startups frequently miss: founder time. If you're a technical co-founder spending meaningful time on qualifying R&D work (not fundraising, not sales, not admin), that salary can be included in the claim. The evidence required is time records — even rough ones are better than none.

The Claim Notification Form: Don't Miss This Deadline

Since April 2023, first-time claimants must submit a Claim Notification Form (CNF) to HMRC within six months of their accounting period end. Miss this deadline and you lose your claim entirely — no extensions, no exceptions.

For a startup with a 31 March 2026 year-end, the CNF deadline is 30 September 2026. Get it in your diary now.

The CNF is submitted online via HMRC's portal. It's a brief administrative form — but the consequence of missing it is catastrophic for a startup expecting a meaningful cash refund.

Common Startup Claim Mistakes

Claiming too late. You can claim retrospectively for two previous accounting periods. Many startups discover R&D tax credits two or three years in and kick themselves. Get it right from year one.

Relying on a generalist accountant. Your annual accounts accountant can file the CT600 with the R&D addition, but unless they specialise in R&D tax, they'll likely miss qualifying costs and produce a weak technical narrative. HMRC has rejected hundreds of generalist-prepared claims since 2023. A specialist typically delivers a larger, better-documented claim.

Bundling all development spend without project analysis. Each claim should identify specific qualifying projects. Not everything you built qualifies, and bundling everything together weakens the narrative and increases HMRC enquiry risk.

Not keeping records. HMRC doesn't require you to maintain lab notebooks, but it does need to see that genuine technological uncertainty existed and was resolved. Slack messages, GitHub commits, design documents and meeting notes all serve as supporting evidence. Build the habit early.

What This Means for Your Business

If you're a startup with a technical product, you should be claiming R&D tax relief. The question is how much. The ERIS scheme means even pre-revenue companies get meaningful cash back; the standard merged scheme is valuable for any profitable entity.

A good R&D tax credit specialist will identify qualifying projects, separate eligible costs from non-qualifying spend, write a defensible technical narrative, and submit alongside your CT600. The process typically requires around half a day from your technical leads. For a full overview of the scheme, see our R&D tax credits explained guide.

Frequently Asked Questions

Can a pre-revenue startup claim R&D tax credits?

Yes. The scheme specifically provides for loss-making companies to receive cash refunds rather than tax credits. Revenue is irrelevant to eligibility — what matters is that you're a UK limited company paying Corporation Tax and conducting qualifying R&D. See CTA 2009 s.1040.

What's the ERIS threshold and how do I know if I qualify?

ERIS applies to loss-making SMEs where qualifying R&D expenditure is at least 30% of total relevant expenditure. Most early-stage product companies clear this comfortably. Your R&D tax specialist can confirm whether you meet the threshold.

Can we claim for work done by contractors we hired through a staffing agency?

Yes, these are classified as externally provided workers (EPWs). 65% of qualifying EPW costs count as eligible R&D expenditure under the merged scheme.

What if we received a grant for some of our R&D work?

Grants received as notified state aid for a specific project can affect R&D claims for that project. However, Innovate UK Smart Grants and many other competitive grants are not notified state aids, so they don't disqualify the associated R&D. Get specialist advice on the specific grant before assuming it blocks a claim.

If you're unsure whether your startup's activities qualify, speak to the Innovation Plus team. We've helped 1,200+ businesses claim over £80 million in R&D tax relief — and we'll tell you straight whether your claim stacks up.