HMRC Rejected Your R&D Tax Relief Claim? Legal Defence Guide

R&D tax relief remains a key economic incentive for innovative businesses in the UK. Yet HMRC are increasingly disputing whether activities truly constitute qualifying R&D under the BEIS Guidelines. Companies who acted responsibly and in good faith are now being pursued for repayments and penalties, even where professional advisors prepared their claims. This guide explains how businesses can respond when HMRC say a project lacks advancement, accuse directors of carelessness, or overlook technical complexity. Drawing on recent First-tier Tribunal decisions including Get Onbord Ltd, Collins Construction Ltd and Stage One Creative Services Ltd, it is evident that taxpayers may succeed where they can demonstrate genuine scientific or technological uncertainty.

HMRC’s R&D Crackdown: Why Legitimate Claims Are Being Challenged

HMRC’s compliance strategy has shifted significantly since 2020, with far more enquiries being opened into claims in software, engineering, construction and manufacturing. HMRC argue that much of the work represents routine commercial development or adaptation of existing tools. These positions are sometimes taken without reference to competent sector professionals, and businesses are told that their work does not amount to an advancement in technology.

Penalties are being issued more readily, even in cases involving reliance on reputable R&D specialists and professional due diligence. Many claimants are left facing repayment demands and the risk of inaccurate allegations of misconduct.

Recent Case Law Shows Taxpayers Can Win R&D Disputes

Get Onbord Ltd v HMRC (2024)

HMRC rejected a software development R&D claim, asserting no qualifying advancement. The Tribunal accepted that genuine technological uncertainty existed, based on detailed evidence from a competent professional involved in the project. The taxpayer’s appeal succeeded, reinforcing the importance of robust technical justification.

Collins Construction Ltd v HMRC (2024)

The Tribunal confirmed that bespoke engineering solutions within construction can constitute qualifying R&D where they require non-routine problem-solving. HMRC’s characterisation of the activities as standard practices was rejected in part, demonstrating that commercial delivery may still involve scientific or technological uncertainty.

Stage One Creative Services Ltd v HMRC (2024)

The Tribunal held that uncertainty must be judged at the outset, not retrospectively following project success. HMRC’s hindsight approach was found incorrect. The case supports the position that overcoming practical unknowns during experimentation can fall within the legislation.

These judgments indicate a consistent judicial expectation that HMRC properly evaluate expert evidence and apply the statutory test correctly.

Defending a Claim: How to Respond When HMRC Challenge R&D Relief

Defending an enquiry requires a strategic approach tailored to HMRC’s concerns. The first step is to carefully analyse the basis of HMRC’s challenge, as their understanding of the project’s scope or complexity is often incomplete. A clear and technically detailed response should be coordinated with the individuals responsible for undertaking the development work, ensuring that explanations directly address why uncertainties existed at the outset and how they were tackled through experimentation, trial, and error.

Legal representatives can play a critical role in ensuring HMRC’s questions remain within statutory boundaries and that the company does not inadvertently concede points through unclear or overly brief responses. Where HMRC seek to impose penalties, representations must demonstrate that the company took “reasonable care,” which may include reliance on qualified advisors, internal controls, and documentation that was prepared contemporaneously.

If HMRC issue a closure notice or formal amendment, lodging an appeal prevents enforcement and triggers independent oversight through internal review or referral to the First-tier Tribunal. Litigation becomes necessary if HMRC persist with a flawed interpretation of the legislation, ignore industry-accepted technical evidence, or attempt to substantiate conclusions based solely on assumption rather than fact. Properly conducted, the defence process often results in successful negotiation or full restoration of relief.

Director Liability: Preventing Personal Exposure in R&D Disputes

Where HMRC believe there is a risk that relief may not be recoverable from the company, they increasingly raise concerns regarding potential personal accountability of directors, particularly in situations involving insolvency or where HMRC allege that the claim was knowingly overstated. Directors must therefore protect their position by ensuring record-keeping demonstrates that they relied upon competent internal project leads and external professional advisors when approving the claim.

Maintaining evidence of transparent governance, risk assessment, and prompt engagement with HMRC enquiries will typically rebut allegations of carelessness or deliberate wrongdoing. It is also essential that directors avoid making repayments or entering instalment arrangements without legal advice, as doing so may prejudice later arguments against liability. Early engagement with specialist legal advisors ensures directors understand their statutory protections under company law and tax legislation, reducing both personal risk and the likelihood of HMRC attempting to escalate matters beyond the corporate entity.

The Burden of Proof: Why Businesses Must Act Proactively

Once HMRC dispute qualification, the legal burden shifts to the taxpayer to prove that the statutory tests have been met. Businesses should therefore produce comprehensive evidence of the technological challenges faced, development iterations undertaken, and why existing public knowledge did not provide a straightforward solution. This proactive presentation of documented uncertainty is key to demonstrating compliance with the BEIS Guidelines and s.1044 CTA 2009.

Adopting a reactive stance may allow misunderstandings to harden into HMRC conclusions, whereas early, well-structured submissions can significantly shape the enquiry’s outcome. Expert input from competent professionals carries substantial evidential weight and is often persuasive in overturning HMRC assumptions. The Tribunal is consistently clear that its purpose is to prevent unjust decisions and ensure HMRC do not apply an incorrect or overly narrow interpretation of R&D legislation. Businesses who actively assert their position at the earliest stage frequently secure favourable results before disputes escalate into litigation.

Why Involving LexLaw at the Earliest Stage Makes a Measurable Difference

LexLaw’s specialist tax dispute lawyers frequently act in matters involving R&D tax enquiries, repayment demands, and penalty appeals. With experience in both defending compliance challenges and conducting litigation before the First-tier Tribunal (Tax Chamber), the firm is well-placed to ensure HMRC apply the correct legal tests and properly consider sector-specific technical evidence. Early intervention can prevent a dispute escalating unnecessarily and can increase the likelihood of HMRC reversing incorrect decisions without litigation.