Summary: This article explains what the R&D Tax Relief Advance Assurance Pilot is, why HMRC is introducing it, how it will work in practice, and what it means for UK startups and SMEs. We also cover the benefits, the risks, and how to decide whether the pilot is right for your business.

From spring 2026, UK small businesses will be able to seek advance assurance on claims for R&D tax relief before filing. HM Revenue & Customs (HMRC) is launching a new pilot scheme that allows companies to ask HMRC to review one key aspect of an R&D claim in advance. 

The aim is simple. Reduce uncertainty. Improve compliance. Give businesses clarity before they submit their claim. 

However, there is an important catch.  

If HMRC refuses advance assurance under the pilot, there will be no right of appeal

What Is the R&D Tax Relief Advance Assurance Pilot?

The advance assurance is a new HMRC initiative designed to give businesses certainty before submitting an R&D tax claim.

Announced in the Autumn Budget on 26 November 2025, the pilot is expected to launch in spring 2026

Under the scheme, small and medium-sized enterprises (SMEs) can ask HMRC to confirm whether a specific element of their proposed R&D claim will qualify. If HMRC agrees, the business can submit its claim knowing that part is unlikely to be challenged later.

The intention is to reduce disputes, avoid unexpected enquiries, and help businesses get claims right the first time.

Key Features Of The Advance Assurance On R&D Tax Relief Claims

Open to more companies

The new pilot is open to any SME, regardless of group structure or prior R&D claims, unlike the existing Advance Assurance Scheme, which is limited to first-time claimants meeting strict criteria.

Voluntary participation

Using the pilot is optional. Businesses can still submit R&D claims without applying for advance assurance.

One issue per application

HMRC will only review one aspect of a claim per application. This means businesses must choose their question carefully.

Four targeted focus areas

HMRC has limited the pilot to four areas that frequently cause confusion:

• Whether a project qualifies as R&D for tax purposes
• Whether overseas R&D costs qualify for relief
• Which party can claim contracted-out R&D?
• Whether the company is exempt from the PAYE and NIC cap

These are common reasons for HMRC enquiries. The pilot aims to address them early.

No fee during the pilot

HMRC has not indicated any charge. Like the existing scheme, the pilot is expected to be free.

In short, the pilot allows SMEs to ask HMRC a clear yes-or-no question before filing. For example:

• “Does this project meet the definition of R&D?”
• “Can we claim for this overseas subcontractor cost?”

HMRC will review the details and respond in advance.

Why Is HMRC Introducing This Pilot?

HMRC has stressed that non-compliance in R&D claims has reached unacceptable levels

Errors, aggressive claims, and poor advice from some agents have led to increased scrutiny. Genuine businesses have often been caught in lengthy enquiries as a result.

The pilot is designed to change that.

Key objectives include:

• Reducing fraud and error

Invalid claims can be stopped before money is paid out, avoiding future clawbacks.

• Helping genuine businesses get it right 

Many SMEs struggle with the technical rules. Advance assurance provides clarity and confidence

• Preventing disputes

Early certainty reduces the risk of post-claim enquiries and unexpected rejections.

• Responding to feedback

Many people view the existing Advance Assurance Scheme as excessively restrictive. Fewer than 1% of eligible first-time claimants used it in 2023–24.

• Supporting real innovation

HMRC wants to tighten compliance without discouraging legitimate R&D investment.

Overall, the pilot is part of a wider effort to support innovation while restoring trust in the R&D tax system.

Read: HMRC has now launched the R&D tax relief advance assurance pilot

How Will the Advance Assurance Pilot Work?

1. Application before filing

The business submits an application to HMRC covering one specific R&D issue. Supporting detail will be required, depending on the topic.

2. HMRC review

HMRC reviews the submission against R&D tax rules. They may request clarification, but they will not review the entire claim.

3. Decision issued

HMRC will either:

• Grant advance assurance, confirming that the item qualifies.
  
• Refuse assurance, indicating it is unlikely to be accepted
  

4. No appeal at this stage

There is no right of appeal against the pilot decision

5. Claim submission

The business then files its R&D claim as normal:

• If assurance was granted, the approved item is included
  
• If assurance was refused, the business must decide whether to exclude it or proceed anyway
  

6. Post-claim checks

HMRC is expected to honour advance assurance where the claim matches what was reviewed. Claims submitted without assurance, or against a refusal, are more likely to be scrutinised. HMRC will run the pilot alongside the existing scheme initially

What If HMRC Says No?

This is the most controversial aspect of the pilot.

If HMRC refuses assurance, you cannot challenge that decision at the pre-claim stage

You still have options:

• Proceed with the claim anyway

This may trigger an enquiry later. Normal appeal rights apply only after a formal HMRC decision.

• Adjust or remove the item

This avoids a likely dispute but may reduce the value of the claim.

• Strengthen documentation

A pilot refusal does not prevent a future tribunal from reaching a different conclusion. HMRC decisions are not always correct, particularly in technical areas.

The lack of appeal makes it critical to submit a clear, well-evidenced application.

Benefits for UK SMEs

The pilot offers clear advantages when used carefully:

• Greater certainty over complex rules
• Lower risk of unexpected enquiries
• Improved cash-flow planning
• Reduced stress around compliance
• Faster resolution compared with full enquiries
• Targeted guidance on common problem areas
  

If HMRC delivers timely and consistent decisions, the pilot could significantly improve the R&D claim process for SMEs.

Limitations to Consider

• Only one issue can be reviewed
• No appeal mechanism
• Assurance is informal, not legislation
• HMRC capacity and technical expertise remain concerns
• Extra preparation is required
• The pilot may have limited availability

The pilot is a useful tool, not a complete solution.

Should Your Business Use the Pilot?

The pilot may suit you if:

• You are unsure about a key aspect of your claim
• This is your first R&D claim
• Your work sits in a grey area
• You have time before filing
• You want upfront certainty

You may skip it if:

• Your claim is straightforward and well-advised
• The uncertain item has a low value.
• You need to file urgently
• You cannot prepare a strong submission

Professional advice is often the deciding factor.

Our R&D Tax Relief Support for Your Business

We help UK startups and SMEs claim R&D tax relief with confidence.

Our services include:

• R&D eligibility assessments
• Advance Assurance Pilot Support.
• Full R&D tax claim preparation
• HMRC enquiry and compliance support
• Ongoing advice on rule changes
• Tailored guidance based on your industry

We focus on accuracy, evidence, and long-term compliance.

Conclusion

The R&D Tax Relief Advance Assurance Pilot marks a significant shift in how HMRC approaches R&D claims. It provides clarity upfront but removes appeal rights at the early stage.

For many SMEs, this trade-off will be worthwhile. For others, careful preparation and professional advice may offer a safer route.

What matters most is claiming R&D relief correctly and with confidence.

If you are planning an R&D claim and want clarity, contact us today to discuss your position and prepare early.

Innovation drives UK businesses forward. The tax system should support that, not hold it back.

The tax relief scheme for research and development (R&D) offers valuable support to companies in the UK. But the rules for the R&D claim notification form are strict, and failure to follow them may cause your claim to be rejected. Below is a clear summary of what you must do.

What is the R&D Claim Notification Form?

From accounting periods beginning on or after 1 April 2023, companies must submit a “claim notification form” to HMRC if they are:

• claiming R&D relief for the first time, or
  
• their last valid claim was made more than three years before the end of the claim notification period.

The claim notification period starts on the first day of your “period of account” and ends 6 months after its end date.

For example, if your accounting period runs from 1 January 2024 to 31 December 2024, your claim notification window is from 1 January 2024 to 30 June 2025. If you fail to notify within that window, any claim for that period may be invalid. Extra care is needed because HMRC has issued clarifications about transitional cases. 

Key Details: What the Form Requires

When completing the claim notification, your company (or your agent) must include:

• The company’s Unique Taxpayer Reference (UTR) matches the one on the CT600.
• Contact details of the senior internal R&D contact (e.g., company director) and any agent.
• The period of account start and end date; the accounting period start and end date.
• A high‑level summary of your planned R&D activities. This should show how the work meets the standard R&D definition.

The Three‑Year Look‑Back Rule

You may not need to submit the claim notification if your company has submitted a valid R&D claim within the three years ending on the last date of your claim notification period. 

Important caveats:

• A claim for a period starting before 1 April 2023 that is made via an amended return on or after 1 April 2023 does not count for the three‑year exemption.
• If HMRC rejected your previous claim, then that claim is treated as if it did not count.

Additional Information Form (AIF)

Even after submitting the claim notification (if required), you must submit an Additional Information Form (AIF) for the accounting period for which you are claiming.

Key points:

• The AIF must be submitted before or on the same day as your Company Tax Return (CT600). 
• If you file the CT600 before the AIF, HMRC will remove your R&D claim. 

What Happens If You Miss the Deadline?

If you fail to file the claim notification when required, your claim may be rejected by HMRC, and you may lose the right to claim for that accounting period. HMRC has acknowledged some transitional errors (in the guidance), but these apply only in narrow cases. 

How Apex Accountants’ R&D Tax Relief Claim Services Can Help

At Apex Accountants we provide end‑to‑end support for claims related to R&D tax relief. Our services include:

• Support with the claim notification form, verifying if your business needs to submit one and helping you meet the deadlines.
• Preparation of the Additional Information Form (AIF) and submission alongside your CT600.
• Full claim preparation services include assessing eligible projects, gathering costs, and preparing technical narratives.
• Strategic advice on filing options, ensuring that your claim aligns with HMRC’s latest rules.

If you are considering an R&D claim and feel unsure about the paperwork or deadlines, our team is ready to help you manage the process professionally.

FAQs on R&D Claim Notification 

Q1. Do I always need to submit a claim notification form when I make an R&D claim?

No. You only need to submit a claim notification form if you are claiming for the first time or if you have not made a valid claim in the last three years before the claim-notification deadline. 

Q2. When exactly is the deadline to submit the claim notification?

The notification period ends six months after the end of the company’s period of account. 

Q3. If my period of account is more than 12 months (covers 2 accounting periods), does that change the rule?

Yes. If the period of account exceeds 12 months, it may cover two or more accounting periods, but you only need to submit one claim notification for that period of account. 

Q4. What happens if my previous claim was made more than three years ago, but it was for a period before 1 April 2023 via an amended return?

That type of claim does not count for the three‑year exemption. You would need to submit a claim notification form. 

Q5. Can I file the AIF and CT600 after the claim notification?

Yes, but the AIF must be submitted before or on the same day as your CT600. The claim notification must be submitted within its deadline. 

Q6. What information is needed in the claim notification form?

You will need UTR, contact details for the company and agent, accounting period dates, period of account dates, and a high‑level summary of planned R&D activity. 

Q7. If I miss the claim notification deadline, can I still claim?

It is very risky. HMRC guidance says if you fail to notify and you were required to, your claim may be invalid. 

Q8. Does submitting the claim notification guarantee that my R&D claim will be accepted?

No. It merely meets the notification requirement. The claim must still meet the R&D qualifying criteria, and the AIF and CT600 must be properly submitted.

Q9. Are there any transitional reliefs or special cases I should be aware of?

Yes. HMRC corrected previous guidance and allowed some claims where the guidance was incorrect. But the window is narrow and should not be relied upon. 

Q10. How far back can I claim R&D tax relief?

The claim itself must normally be submitted as part of the CT600 or an amendment within one year after the original filing date, but the claim notification requirement is separate and must meet its own deadline.

Research and Development (R&D) tax relief has long been an essential resource for businesses in the UK, providing financial support to companies investing in innovation. However, recent reports show a worrying trend: a significant decline in the number of small and medium-sized enterprises (SMEs) in the South West of England claiming this relief.

According to the latest figures from HMRC, there has been a £50m drop in claims from South West SMEs in the 2023-24 period. This article explores the reasons behind the decline and why businesses should continue to take advantage of R&D tax relief.

The Decline in R&D Tax Claims in South West England

In the tax year 2023-24, South West SMEs made 2,780 claims, a drop from 4,055 claims in the previous year. The total amount of tax relief claimed also fell from £245m to £195m. The decline in R&D tax claims in South West England has been seen across various regions:

• Cornwall & Isles of Scilly: 220 claims (down from 330)
  
• Devon: 420 claims (down from 665)
  
• Gloucestershire & Wiltshire: 710 claims (down from 1,050)
  
• North Somerset, Somerset, and Dorset: 780 claims (down from 1,115)
  
• West of England: 650 claims (down from 895)
  

This decrease is concerning for both businesses and the wider regional economy. R&D tax relief plays a crucial role in encouraging businesses to innovate, leading to the development of new products, services, and processes that benefit both the companies themselves and the local economy.

Why Are South West SMEs Avoiding R&D Tax Relief?

Several factors have contributed to the decline in claims.

1. Increased Compliance Requirements: Recent changes in the application process have made it more difficult for SMEs to navigate the system. The tightening of rules has led to concerns over the time and cost involved in making a claim.
   
2. Reduced Benefits for SMEs: The government has reduced the rate of tax relief available for SMEs. This has disincentivised smaller companies from claiming the relief.
   
3. Concerns Over False Claims: Following a crackdown on fraudulent claims, businesses may be hesitant to apply for fear of being caught up in compliance checks, even when their claims are legitimate.
   

The Importance of R&D Tax Relief for SMEs

R&D tax relief can provide up to £27 for every £100 spent on qualifying R&D activities. For SMEs, this relief can make a substantial difference to cash flow, helping them to reinvest in innovation. Some benefits of R&D tax relief include:

• Increased innovation capacity: With additional funding, businesses can invest in developing new products, services, or processes.
  
• Financial support for high-risk projects: R&D often involves high costs and risks, and the relief can help offset these.
  
• Encouragement for growth: As businesses innovate, they generate new revenue streams, which may lead to higher tax receipts in the long term.
  

The Role of Larger Companies and RDEC

Although SMEs have seen a decline in claims, the larger R&D Expenditure Credit (RDEC) scheme for bigger companies has seen a growth in claims, with the total relief amount rising by 36%. This shift has raised concerns about the growing disparity in R&D tax relief claims between SMEs and larger firms. SMEs, which make up nearly 99% of UK businesses, must be given the tools and support to continue benefiting from this crucial tax relief.

Why SMEs Should Continue Claiming R&D Tax Relief

Innovation is the backbone of any successful business. While the process of claiming R&D tax relief for SMEs can be complex, businesses should not shy away from this valuable support. Here’s why:

• Innovative businesses fuel economic growth: Successful innovations create new products and services, expanding business opportunities and improving the economy.
  
• Avoid losing out: The reduced compliance burden is temporary. Government efforts are underway to simplify the process.
  
• Long-term financial benefits: The short-term administrative effort is outweighed by the long-term benefits of innovation.
  

How Apex Accountants Can Help South West SMEs With R&D Tax Relief Claims

At Apex Accountants, we specialise in helping businesses navigate the complexities of R&D tax relief claims. Our team of experts provides tailored advice and support to ensure your R&D tax claims are accurate and compliant. Whether you’re a small business in the South West or a larger firm across the UK, we are here to guide you through the process, helping you maximise the tax relief available to your business.

• R&D Tax Relief Claims: We assist with identifying qualifying R&D activities, preparing claims, and managing compliance.
  
• Tax Planning: We provide strategic tax planning advice to help you reduce your tax liabilities while supporting innovation.
  
• Compliance Support: Our experts ensure that your claims meet all HMRC requirements, reducing the risk of an audit.
  

Conclusion

The decline in R&D tax relief claims by SMEs in the South West is a troubling development that may hinder innovation and growth. However, businesses can still benefit from this valuable support if they understand the process and take the necessary steps to comply with the new rules. At Apex Accountants, we are committed to helping you unlock the full potential of R&D tax relief, ensuring your business stays competitive in an ever-evolving market.If you’re unsure about your eligibility or need help with your claim, contact Apex Accountants today for expert guidance.