When to Appeal an HMRC R&D Decision (and When to Settle)

When HMRC concludes an R&D enquiry by issuing an amendment notice, you face a decision: accept the amendment, request an internal statutory review, or appeal to the First-tier Tribunal (Tax Chamber). The right choice depends on the strength of your technical evidence, the amount at stake, and the cost of fighting. This guide covers the appeal routes available under the R&D tax relief framework, gives a decision framework, and sets out realistic timescales and costs. If you are still in the enquiry process, read the week-by-week timeline first. Use the eligibility checker to test your original claim position.

The 30-Day Window

Once HMRC issues an amendment notice or closure notice under section 28A of the Taxes Management Act 1970, you have 30 days to decide your response. The 30 days run from the date on the notice. Three options are available:

• Accept the amendment. Pay the additional tax plus interest. The enquiry closes. No further recourse on the same point for the same period.
• Request a statutory review. HMRC assigns an independent officer to review the decision. Free, takes up to 45 days. Does not prevent a subsequent tribunal appeal.
• Appeal to the First-tier Tribunal. Formal judicial process. Takes 12 to 24 months. You must lodge the notice of appeal within the 30-day window if you do not request a review, or within 30 days of the review outcome if you do.

Missing the 30-day deadline does not automatically extinguish your appeal rights, but you will need the Tribunal's permission to appeal late. Late applications are not guaranteed and should be avoided.

Route 1: HMRC Statutory Review

A statutory review under section 49A of the Taxes Management Act 1970 is the first step for most companies. The reviewing officer is drawn from a different HMRC team and has not been involved in the enquiry. The review is a paper exercise: the reviewer reads the enquiry file and the company's representations, and issues a review conclusion letter within 45 days (though extensions are common in complex cases).

The reviewing officer can uphold HMRC's original decision, vary it (e.g. allow part of the claim and disallow part), or cancel it entirely. A material proportion of R&D cases that reach the review stage result in at least a partial variation in the company's favour, because the review brings fresh eyes to the evidence and HMRC compliance officers are sometimes inconsistent in applying the qualifying activities test.

The statutory review is free of charge. It does not suspend the tax payment in the same way that a tribunal appeal does, but in practice HMRC does not pursue payment until the review is concluded. After the review, the company has 30 days to accept the review outcome or appeal to the Tribunal.

Route 2: First-tier Tribunal (Tax Chamber)

The First-tier Tribunal (Tax Chamber) is an independent judicial body that hears appeals against HMRC decisions. It is governed by the Tribunal Procedure (First-tier Tribunal) (Tax Chamber) Rules 2009. For R&D cases, the Tribunal considers three questions: whether the qualifying activities test is met, whether the cost categorisation is correct, and whether the quantum (apportionment) is defensible. All three are fact-intensive questions.

How to Lodge a Tribunal Appeal

The appeal notice is lodged using the T240 form, available from the HM Courts and Tribunals Service. The notice must state the grounds of appeal, the accounting period in question, and the amount in dispute. HMRC then has 60 days to provide its statement of case, setting out the full factual and legal basis for the amendment. The company has 42 days to provide a reply. The Tribunal then issues case management directions setting the timetable through to the hearing.

Tribunal Timeline

From lodging the appeal notice to the substantive hearing, R&D cases typically take 12 to 24 months. Complex cases with extensive technical expert evidence and multiple projects can take longer. The Tribunal aims to manage cases efficiently, but the volume of tax appeals means waiting times can be lengthy.

A detailed breakdown of the pre-hearing stages is in the enquiry timeline guide.

Tribunal Costs

Standard-track First-tier Tribunal cases do not carry filing fees. The costs are professional: specialist adviser fees for preparing the appeal bundle, witness statements, and attending the hearing, plus, where required, independent expert witness fees for technical evidence on the qualifying activities test.

For a contested R&D case with one to five qualifying projects and a quantum in dispute of £100,000 to £500,000, total professional costs on the company's side typically range from £15,000 to £60,000. Costs are not usually awarded against either party in Tax Chamber cases unless the conduct of one party has been unreasonable.

This means that for claims with a quantum in dispute below approximately £20,000, the cost of a full tribunal appeal may exceed the value of winning. Settlement or acceptance is usually the appropriate outcome in those cases.

Route 3: Upper Tribunal

If you lose at the First-tier Tribunal, you can appeal to the Upper Tribunal on a point of law only. The Upper Tribunal does not rehear the factual evidence. It considers whether the First-tier Tribunal made a legal error in interpreting the qualifying activities test or in applying the evidential rules. Upper Tribunal cases are rare in R&D disputes and require specialist tax barrister involvement.

Upper Tribunal and Court of Appeal decisions create binding precedent. Where a case turns on a question of legal interpretation that has not been authoritatively decided, an Upper Tribunal case may be worth pursuing even where the commercial value is modest, because a favourable outcome benefits the whole industry. In practice, HMRC and industry bodies sometimes agree to take a test case to the Upper Tribunal to resolve a point of principle.

The Decision Framework: Fight or Settle?

Whether to appeal or settle depends on four factors assessed together, not in isolation.

Factor 1: Strength of Technical Evidence

This is the most important factor. If the company has contemporaneous evidence of qualifying activities: experiment logs, technical meeting notes, sprint records showing iterative work on a specific uncertainty, and staff who can articulate the scientific or technological question in terms the tribunal will accept, the case is worth fighting. The case law reviewed in the tribunal case law guide shows that where evidence is thin, retrospective, or generic, HMRC usually wins.

A specialist adviser should assess the quality of the technical evidence before a decision to appeal is made. If the evidence would not survive a cross-examination at tribunal, settlement at the review stage is usually the better outcome.

Factor 2: Amount in Dispute

A claim where £200,000 in relief is at stake justifies more expenditure on appeal than a claim where £18,000 is at stake. A rough rule of thumb: if the professional cost of a full tribunal appeal (including expert witness fees) would exceed 30% to 40% of the amount that could be recovered by winning, the financial case for fighting becomes marginal. Settlement negotiations with HMRC can often recover a partial amount at considerably lower professional cost.

Factor 3: Management Time

An R&D tribunal case requires meaningful time from technical witnesses: the engineers, scientists, or developers who carried out the qualifying work. They will need to provide written witness statements and attend the hearing. For fast-growing companies, the opportunity cost of key technical staff being tied up in tribunal proceedings for 12 to 24 months can be considerable. This factor is rarely decisive on its own, but it should be part of the calculation.

Factor 4: HMRC's Legal Position

Some enquiries are settled in HMRC's favour not because the facts were bad, but because HMRC has applied the qualifying activities test too restrictively. Where HMRC's amendment notice cites a tribunal decision but applies it to facts that are materially different from the cited case, a specialist adviser may recommend that the legal interpretation is worth contesting. The tribunal is an independent body and is not bound to accept HMRC's characterisation of the facts.

Settlement Negotiations

Many R&D cases settle at the review stage or during the appeal, before a hearing takes place. Settlement typically involves agreeing with HMRC on the qualifying percentage of staff time for each project, the categorisation of borderline cost items, and the treatment of specific subcontractor or cloud cost items.

The company's negotiating position is stronger when: the technical evidence is contemporaneous and clear, HMRC's amendment notice relies on a strained reading of the qualifying activities test, and the specialist adviser has a track record of representing companies in similar enquiries. The exchange of statements of case in the appeal process often produces settlement because both parties see the full strength of the opposing arguments for the first time.

For the penalty implications of settling versus winning, see the discussion of Schedule 24 of the Finance Act 2007 in the nudge letter playbook.

When Accepting the Amendment Is the Right Answer

Not every amendment notice should be challenged. Accepting the amendment is the right outcome when:

• The enquiry has revealed genuine errors, such as overseas subcontractor costs included without meeting the UK provision exception, or dividends included in staff costs.
• The apportionment percentages are not defensible on the evidence available and cannot be reconstructed.
• The amount in dispute is below the threshold at which the cost of appeal is commercially justified.
• The technical witnesses are not in a position to give evidence that would satisfy the competent professional test at tribunal.

Accepting the amendment and paying the tax plus interest closes the matter quickly. It also allows the company to focus on getting future claims right, with better evidence and properly structured narratives, rather than spending management time defending a claim that has structural weaknesses.

For a definition of the qualifying activities test and the evidence HMRC expects, see the R&D tax glossary. For the full eligible expenses framework, see the qualifying expenditure guide.