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How to prepare for HMRC enquiries into R&D tax claims

Date

06 Nov 2025

Category

Tax, R&D Tax Credits

Author

Emma Hussey

How to prepare for HMRC enquiries into R&D tax claims

Navigating the landscape of R&D tax relief is a vital way for innovative UK businesses to unlock financial value. However, with HMRC taking a more proactive and rigorous approach to compliance, it is essential that companies claiming R&D tax relief are prepared. A thorough and well-documented claim is your strongest defence against an HMRC R&D enquiry.
This article outlines the practical steps your business can take to prepare for an enquiry, ensuring your claims are robust, transparent, and fully compliant.

What is an HMRC R&D enquiry?

An HMRC R&D enquiry is an investigation into your company's R&D tax relief claim. These enquiries are becoming more common as HMRC seeks to crack down on fraudulent or erroneous claims. They can range from a simple request for additional information to an in-depth audit of your technical and financial documentation.
The purpose of the enquiry is to verify that your R&D tax relief claim meets the government’s criteria for innovation relief. Being prepared is not just about avoiding penalties; it is about building confidence in your compliance and protecting your business's financial position.

How to prepare your claim for an HMRC R&D enquiry

A well-prepared claim is a strong claim. Taking the right steps from the outset will significantly reduce the risk of an enquiry and give you peace of mind.

Documentation is your foundation

HMRC places significant emphasis on contemporaneous documentation. This means having records created at the time the R&D activity took place.
  • Project Documentation: This includes detailed project plans, design documents, technical specifications, and records of iterations or failed attempts.
  • Contemporaneous Records: Keep detailed minutes from meetings, site diaries, and logs of technical challenges and how they were overcome. This provides a clear audit trail.
  • Financial Records: Ensure your financial records, such as general ledgers, payroll data, and supplier invoices, are meticulously organised and can be clearly linked to the qualifying R&D expenditure.

Technical Narrative: The 'what' and 'why'

A clear, well-structured technical narrative is often the first thing HMRC will review. This document should explain the R&D project in laymans terms, demonstrating how it meets the R&D tax relief criteria.
  • Technical Uncertainty: Clearly articulate the specific scientific or technological uncertainties your project faced. Explain why a competent professional in the field could not have easily resolved these challenges.
  • Technical Advance: Detail the new knowledge or capability your project sought to acheive. This is crucial in highlighting how your project sought an advance.
  • The Work Undertaken: Describe the specific R&D activities undertaken to resolve the uncertainty. This includes methods, approaches, trials, modelling, and analysis.

Financials: The 'who' and 'how much'

The financial side of your R&D claim needs to be as robust as the technical aspect.
  • Cost Segregation: Accurately separate qualifying R&D costs from non-qualifying costs. Be prepared to justify how you have apportioned costs for staff, consumables, and subcontractor fees. HMRC expect to see sound reasoning and a structured methodology.
  • Staffing Records: Maintain records of the staff involved in the R&D project, including their roles, qualifications, and the time they spent on qualifying activities.

What to do if you receive an enquiry

If you receive a letter from HMRC, do not panic.
  • Engage a specialist: Your first step should be to contact an R&D tax specialist. They can review the enquiry letter, advise you on the best course of action, and act as a professional intermediary with HMRC.
  • Review your claim: A specialist will help you thoroughly review your original claim and gather any additional information HMRC has requested.
  • Prepare your response: Your specialist will then help you compile a comprehensive response, presenting the technical and financial evidence in a clear, compelling manner.

We are here to help

Successfully navigating an HMRC R&D enquiry comes down to preparation and a robust approach to compliance. By ensuring your claims are built on a foundation of solid documentation and a clear technical narrative from the outset, you can give your business the best possible chance of a positive outcome.
Azets has a dedicated team of R&D tax specialists who can help you prepare a robust claim and, if an enquiry should arise, defend your position.

Get in touch

HMRC primarily looks for evidence that a project sought to achieve a scientific or technological advance, encountered technical uncertainties, and that the costs claimed are directly linked to the qualifying R&D activities. They will scrutinise both your technical narrative and your financial records.

While perfect documentation is the ideal, businesses can still make a valid claim. However, you must be able to reasonably demonstrate that qualifying R&D activity took place. A specialist can help you review your existing records to build the strongest possible case.

In the UK, R&D tax relief is the primary form of innovation relief offered by the government. The terms are often used interchangeably, but R&D tax relief refers to the specific scheme, whereas innovation relief is a broader term for government incentives designed to encourage business innovation.

Yes, using a qualified R&D advisor can significantly strengthen your claim. They can help you identify qualifying projects and costs you may have missed, and ensure your claim is structured correctly and is fully compliant with HMRC's guidelines. It is essential to choose a reputable firm with a strong track record.

Emma Hussey

Director