A failed prototype, a new production process or months spent resolving a technical problem can feel like ordinary day-to-day business activity. Yet, where the work seeks an advance in science or technology, it may support a valuable Corporation Tax claim. Knowing how to claim R&D relief means looking beyond the label of “research” and understanding the technical uncertainty your business has worked to overcome.
For many owner-managed companies, the opportunity is missed because the development work is carried out by the people closest to the business: directors, engineers, software teams, designers and production staff. The project may not take place in a laboratory, and it does not need to result in a successful product. What matters is the nature of the work, the evidence behind it and a claim that reflects HMRC’s rules.
What R&D relief is designed to support
R&D tax relief is available to companies carrying out qualifying research and development. The purpose is to encourage businesses to invest in solving scientific or technological problems that cannot be readily resolved using publicly available knowledge or standard professional practice.
A qualifying project must aim to achieve an advance in science or technology. The company must also face scientific or technological uncertainty – in other words, competent professionals in the field could not easily work out how to achieve the result, or whether it could be achieved at all.
This is broader than many businesses expect. A manufacturer improving an automated line, a construction firm developing a more effective technical method, or a software company building functionality that existing tools cannot provide may all have qualifying activity. The sector is not the deciding factor. The work itself is.
Commercial difficulty alone is not enough. Creating a new website, changing the appearance of a product, adapting an existing system for one customer or making a process cheaper will not qualify unless the work involved genuine technological uncertainty. Similarly, advances in the arts, humanities or social sciences fall outside the relief.
How to claim R&D relief: start with the project
The strongest claims begin with the project story, not a spreadsheet of costs. Before calculating expenditure, identify the specific problem, what the business was trying to achieve and why the solution was not straightforward at the outset.
A clear technical narrative should explain the baseline. What was already known or available? It should then set out the intended advance and the uncertainties encountered. Finally, it should describe the work undertaken to resolve those uncertainties, including testing, iterations, failed approaches and the outcome.
Do not be put off if the project did not succeed. Unsuccessful R&D can still qualify where the company carried out genuine work to resolve an eligible uncertainty. Equally, do not assume every part of a successful development project qualifies. Routine implementation, testing for quality control, commercial roll-out and ordinary maintenance may need to be separated from the qualifying work.
The people who carried out the work are usually best placed to explain it. Directors and technical staff should be involved early, while the project details are still clear. An accountant can turn that information into a properly supported tax claim, but cannot safely invent the technical rationale after the event.
Identify the costs connected to qualifying work
Once the qualifying activity is understood, the next task is to identify the costs directly connected with it. The figures need to be based on business records and a sensible allocation method, particularly where staff divide their time between R&D and routine work.
Eligible expenditure can include staff costs for employees working on the project, such as salaries, employer’s National Insurance contributions and pension contributions. It can also include some payments to externally provided workers, qualifying subcontractor costs, materials used up during R&D, and certain software, cloud computing and data costs.
For businesses with small technical teams, director time can be particularly significant. However, estimates must be realistic and capable of explanation. A director who spent one day a week overseeing development should not be presented as working full-time on R&D simply because the potential tax benefit is attractive.
Some costs require extra care. Capital equipment does not normally form part of an R&D tax relief claim, although capital allowances may be available separately. Marketing, patenting, production after development, customer support and general overheads are also not automatically qualifying costs. Subcontracted work can qualify, but the answer may depend on the contract, who bears the financial risk and which party is entitled to exploit the R&D results.
Keeping project codes, timesheets, meeting notes, test reports, invoices and payroll information will make this exercise far easier. Contemporaneous records are more persuasive than broad recollections prepared close to the filing deadline.
Understand which R&D scheme applies
The UK R&D rules have changed significantly in recent years. For accounting periods beginning on or after 1 April 2024, most companies claim under the merged R&D scheme. This provides a taxable expenditure credit, currently calculated at 20% of qualifying expenditure. The final benefit depends on the company’s tax position, including whether it is profitable or loss-making.
Loss-making companies that meet the R&D intensity test may instead be eligible for Enhanced R&D Intensive Support. Broadly, this is aimed at businesses whose qualifying R&D expenditure represents at least 30% of their total expenditure, although detailed calculations and exclusions apply.
Claims for earlier accounting periods may still fall under the previous SME or RDEC rules. This is one reason not to rely on outdated online guidance or a standard percentage. The right approach depends on your accounting period, company circumstances and the nature of the expenditure.
There are also restrictions around overseas R&D. In many cases, qualifying subcontracted work and externally provided workers must be based in the UK. Limited exceptions can apply where conditions outside the company’s control make UK-based activity impossible, but cost savings or access to cheaper labour will not normally be enough.
Meet the deadlines and filing requirements
An R&D claim is made through the company’s Corporation Tax return. In most cases, the deadline is two years after the end of the accounting period to which the claim relates. Waiting until the deadline can create avoidable pressure, especially when technical evidence and cost records need to be gathered from several people.
Many companies must submit a claim notification form before claiming. This applies particularly where the company has not claimed R&D relief in one of the previous three accounting periods. The notification deadline is generally six months after the end of the relevant accounting period, so it can arrive much sooner than the Corporation Tax filing deadline.
Companies also usually need to complete HMRC’s additional information form before filing the Corporation Tax return containing the claim. This form asks for details of the projects, qualifying costs and the people responsible for the submission. HMRC uses the information to understand the basis of the claim, so generic wording or unsupported figures can increase the risk of questions.
The practical sequence is straightforward, but each stage needs care: review projects, gather evidence, calculate eligible costs, check notification requirements, submit the additional information form and include the claim in the Company Tax Return. Where the claim affects a prior return, amendments and resulting tax calculations must also be handled correctly.
Prepare for questions from HMRC
R&D relief is a legitimate incentive, but it is an area of active HMRC scrutiny. A well-prepared claim should be able to answer simple questions: what was the advance, what uncertainty existed, who worked on it, what did they do and how were the costs calculated?
Avoid claims built around vague phrases such as “we developed an innovative solution”. Innovation in a commercial sense is not the test. Specific, factual descriptions are more useful. For example, explain why existing software architecture could not process a required volume of data, what methods were attempted and why those methods failed or required further development.
A proportionate claim is also a more credible one. A small company may have a modest but worthwhile claim based on a limited number of projects. There is no advantage in stretching routine work into R&D. The relief should support real investment, not create a compliance problem later.
For growing businesses, reviewing R&D activity as part of the year-round accounts process is often more effective than treating it as a last-minute tax exercise. It improves record keeping, helps directors understand where development money is being spent and can inform decisions about future projects.
If your company has been tackling technical challenges, a focused conversation can establish whether there is a claim worth pursuing and what evidence is needed. RK & Co can help turn the detail already within your business into a clear, practical claim that supports both tax efficiency and better planning for the work ahead.