HMRC R&D Tax Enquiry & Dispute Support

There may be options available if HMRC challenges, reduces or rejects an R&D tax relief claim, but the position can become technically and procedurally complex very quickly. The appropriate response depends on what HMRC has concluded, what stage the compliance check has reached and whether the underlying R&D claim can still be fully supported.

HMRC’s own R&D guidance makes clear that claims are examined against a range of risk factors and common errors. It also states that where risks remain, formal enquiry procedures may follow, including the use of information powers and, where appropriate, consideration of penalties.

That is why a disagreement with HMRC should not be treated as simply a matter of sending another explanation. A business may genuinely have undertaken qualifying R&D but still find its claim weakened by missing evidence, an unclear description of the scientific or technological advance, poorly defined uncertainties, errors in qualifying expenditure or failure to meet current claims requirements. HMRC’s current guidance is explicit that prescribed additional information is required for R&D claims and that failure to meet certain claim requirements can make a claim invalid.

The rules have also changed significantly in recent years, including the introduction of the merged R&D expenditure credit scheme, Enhanced R&D Intensive Support (ERIS), additional-information requirements and, for some companies, claim-notification requirements. What applied to an earlier accounting period may therefore not be the same as the rules applying to a current claim.

Most importantly, HMRC itself recommends keeping the information used to establish R&D eligibility because it may be needed if a compliance check is opened. HMRC also recognises the importance of the competent professional when establishing whether the underlying project meets the R&D definition.

For that reason, professional intervention early in the process can be extremely valuable. Rather than risking further correspondence with HMRC before the strength of the claim is understood, it can make sense to have the position independently reviewed by specialists who deal with R&D tax relief every day.

Hamilton Wood & Company specialises in R&D tax relief claims and HMRC enquiry support. If HMRC has questioned or challenged your claim, speak to our team as soon as possible. We can assess the position, identify where the real risks lie and help you understand the most appropriate way forward — leaving you free to concentrate on running your business.

If an HMRC R&D compliance check reaches the point where HMRC makes a formal decision and your business disagrees with the outcome, a statutory review may become part of the dispute process. It is a formal reconsideration of an appealable HMRC decision by a review officer who was not involved in making the original decision. A statutory review will normally be completed within 45 days, although HMRC can agree a longer period where necessary. The decision can be upheld, varied or cancelled.

By this stage, however, the issue is usually no longer just whether your business carried out innovative work. HMRC may be looking closely at whether the project actually meets the tax definition of R&D, whether the qualifying expenditure has been calculated correctly and whether the supporting information is strong enough to substantiate the claim. HMRC’s own R&D guidance identifies a number of common errors, including claiming non-qualifying activities or expenditure and failing to demonstrate clearly how the relief has been calculated.

This is where businesses can run into difficulty. A company may have undertaken genuinely qualifying R&D but still underclaim, miss qualifying expenditure, submit an invalid claim or have part or all of the claim challenged because important technical or financial information has been overlooked. HMRC itself stresses that R&D claims must satisfy specific conditions and that supporting information is required; for example, an R&D claim without the required Additional Information Form is invalid.

There is also a wider reason to take an R&D dispute seriously. HMRC compliance checks can range from a relatively limited enquiry to a much more detailed investigation, and HMRC officers are instructed to remain alert to risks involving other taxes and duties. An R&D enquiry does not automatically become a wider investigation, but if HMRC identifies separate concerns while examining the claim, those risks can be referred for further action.

That is why partnering with an experienced R&D specialist can be particularly valuable. The R&D rules have changed substantially in recent years and the interaction between technical eligibility, qualifying expenditure, claim requirements and HMRC compliance can be difficult to navigate while also running a business. The cost of getting it wrong may not simply be a rejected claim — it can also mean claiming less than your business is legitimately entitled to, lengthy HMRC correspondence, additional professional costs and potentially wider scrutiny where other tax risks are identified.

Hamilton Wood & Company specialises in R&D tax relief claims and HMRC enquiry support. Whether you are preparing a new claim or HMRC has already challenged one, involving specialists early can help ensure the position is properly assessed before matters become more complicated. Speak to our team and let us deal with the technical detail while you concentrate on running your business.

Alternative Dispute Resolution (ADR) can sometimes help where an HMRC R&D dispute has reached an impasse, but it is not an automatic solution and it will not be suitable for every case. HMRC describes ADR as a flexible process in which an impartial HMRC mediator helps the parties explore whether a tax dispute can be resolved without progressing directly to the Tribunal or Court. It can be considered during a compliance check or after an appealable decision has been made.

For an R&D dispute, the underlying claim still has to withstand HMRC scrutiny. ADR does not make technical weaknesses disappear, and HMRC will not compromise its interpretation of the law simply to reach an agreement. Its own guidance says that ADR may be less suitable where there are significant doubts about the strength or reliability of the evidence, while mediators may challenge both sides on how their position could fare at Tribunal.

That is particularly important with R&D tax relief because the claim ultimately depends on satisfying specific conditions, including demonstrating a qualifying advance in science or technology and the scientific or technological uncertainties involved. A business can have undertaken genuine development work yet still find itself in difficulty if the claim has been understated, incorrectly structured, inadequately evidenced or prepared under the wrong version of the rules. HMRC’s R&D guidance confirms that these qualifying conditions must be demonstrated rather than assumed.

The ADR process itself also requires careful management. HMRC aims to decide whether a case is suitable for ADR within 30 days, and once mediation begins the aim is normally to conclude it within four months. Information supplied during ADR may also form part of HMRC’s formal record, so this is not a stage where a business should casually provide additional material without first understanding its tax position.

There can also be broader consequences when an R&D claim attracts sustained HMRC attention. An R&D enquiry does not automatically lead to a wider investigation, but HMRC compliance officers are expected to consider other tax risks that become apparent during a check. That makes it particularly important that the original claim, accounting position and subsequent explanations are coherent and professionally considered.

For many businesses, the bigger risk is therefore not simply losing a disputed claim. It can be missing legitimate qualifying expenditure, underclaiming relief, having a claim reduced or rejected, becoming tied up in months of HMRC correspondence or potentially attracting wider scrutiny if separate tax concerns emerge.

Hamilton Wood & Company specialises in R&D tax relief claims and HMRC enquiry support. If your dispute has reached the stage where ADR is being discussed, or HMRC correspondence is becoming increasingly detailed, this is an ideal point to involve experienced R&D specialists. We can assess the strength of the underlying claim and help you understand the commercial and tax risks before matters progress further — allowing you to focus on running your business rather than trying to navigate an increasingly complex HMRC process.

Potentially, yes — but a compliance check does not automatically mean that a penalty will be charged. HMRC first has to establish whether there is an inaccuracy and, where relevant, what behaviour caused it. HMRC’s own guidance distinguishes between mistakes made despite taking reasonable care and inaccuracies that are careless, deliberate or deliberately concealed. A genuine mistake does not therefore automatically result in a penalty.

For R&D tax relief claims, the risk is that apparently small mistakes can have much wider consequences once HMRC starts examining the claim in detail. HMRC specifically identifies recurring R&D errors such as including activities that do not qualify, claiming expenditure outside the permitted categories or applying the expenditure rules incorrectly.

If an incorrect R&D claim has resulted in tax being understated or relief being overclaimed, HMRC can consider an inaccuracy penalty. The level depends on the circumstances and the behaviour involved, with HMRC taking a much more serious view of deliberate errors than mistakes made despite reasonable care.

This is one of the reasons we believe R&D tax relief should be approached as a specialist tax claim rather than a form-filling exercise. A company may carry out perfectly legitimate qualifying R&D yet still underclaim, overlook qualifying expenditure, present the project inadequately or make technical errors that expose an otherwise valid claim to challenge.

And once HMRC starts asking questions, the issue can become broader than the original R&D calculation. A compliance check can develop as HMRC gathers more information and identifies further areas of tax risk. That does not mean an R&D enquiry automatically becomes a wider tax investigation, but it is another reason to make sure the claim has been professionally assessed and prepared from the beginning.

Hamilton Wood & Company specialises in R&D tax relief claims and HMRC enquiry support. Working with experienced R&D specialists can help protect you at both ends of the process: making sure you do not unnecessarily miss out or underclaim, while reducing the risk of submitting a claim that cannot withstand HMRC scrutiny.

If HMRC has already opened a compliance check, or you are considering making an R&D claim and want confidence that it is being handled properly, speak to Hamilton Wood & Company before matters become more complicated. We can deal with the R&D tax detail while you remain focused on running your business.