Trusted R&D tax consultants specialising in HMRC compliant, end-to-end claims across a wide range of industries.
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Leyton is a global innovation funding consultancy that helps businesses unlock value through R&D tax relief and strategic funding solutions. We partner with organisations of all sizes to improve business performance, accelerate innovation, and achieve sustainable growth.
In the UK, Leyton’s expertise covers R&D tax credits, Innovation Funding, Energy Consultancy, Capital Allowances, and Business Rates. Our multidisciplinary consultants across industries such as science, engineering, manufacturing, technology, software, tax and accountancy work together to identify, qualify and maximise R&D claims while ensuring compliance and accuracy in every HMRC submission.
With five UK offices and 250 professionals, Leyton is a trusted partner for innovation‑driven businesses seeking to uncover hidden potential and reinvest in the next wave of research and development.
Research and Development (R&D) Tax Credits are a UK government incentive designed to encourage innovation by rewarding companies that invest in advancing science and technology. Businesses that meet the qualifying criteria can claim tax relief or cashback for eligible R&D activities.
Eligibility for UK R&D tax credits typically includes, but is not limited to, the key criteria below:
1. Your business must be subject to UK Corporation Tax.
2. Your project must aim to create an advance in science or technology – going further than routine improvements.
3. The project must involve challenges that could not easily be resolved by a competent professional in the field.
4. Adopt a systematic approach. You must follow a structured process of research, design, testing and analysis to overcome those uncertainties.
At Leyton UK, we’re more than tax experts. Our R&D tax consultancy service has a track record of uncovering eligible costs often overlooked by in-house teams, accountants or generalist tax consultancy firms.
Our team of specialists have years of in-depth industry experience, which means that they can go beyond the obvious and identify a wider range of qualifying R&D expenses. This expertise will ensure that you don’t miss out on the full potential of your R&D Tax Credits claim.
Our consultants can help you review your projects, enhance the quality of your claims, and ensure compliance with HMRC guidance.
Our specialists will guide you through the updated merged RDEC scheme, which offers a 20% above the line credit for both SMEs and large companies.
We’re committed to helping loss-making SMEs succeed by helping them take advantage of the extra support available through ERIS. SMEs can receive a non-taxable credit of up to 14.5% and an extra 86% deduction on their qualifying spend.
We can help small to medium enterprises claim valuable research and development tax credits through HMRC’s R&D SME scheme (available for accounting periods that start before 1 April 2024).
Our dedicated team provides an end-to-end service for larger businesses, allowing them to receive up to 20% tax relief on eligible expenses (available for accounting periods that start before 1 April 2024).
We assess the likelihood of a successful defence and implement a tactful response based on our extensive knowledge of HMRC activities and our close working relationship with this authority.
As part of the Leyton UK offering, we provide bespoke audit, advisory and consultancy services, leveraging our extensive expertise in R&D incentives. This enables an accelerated RDEC claim delivery process.
We support some of the UK’s most innovative businsses across mutiple sectors. From first‑time claimants to complex multi‑year submissions, learn more about how our specialists have helped transform technical advancements into measurable financial impact.


See how Leyton helped Toolrite Limited secure R&D tax savings and boost innovation.

See how Comtek Networks optimised innovation funding with Leyton’s expert R&D tax relief support
Our tax and technical consultants will help your business get the most out of your R&D Tax Credits claim. Their specialist field experience means we can dig deep into the details and identify qualifying expenditure to maximise your claim.
We’ve been saving UK businesses time and money for over 12 years. We prioritise compliance, giving our clients confidence and peace of mind. Our payment terms are tailored around your business needs.
Use our R&D Tax Credits calculator to discover how much you can claim.
The R&D Tax Credit scheme is an important HMRC incentive that rewards companies on innovative projects. You can reinvest this financial benefit in current or upcoming research and development projects, hiring new staff and supporting your overall growth.
After a successful claim, your tax credits are paid directly to you from HMRC, helping your business’ cash flow.
As R&D Tax Credit specialists, we help organisations identify and document their eligible research and development activities for claiming tax relief. With our specialised scientific, technological and tax knowledge, we can guide you through often complex and ever-changing R&D tax regulations, We’ll ensure that you’re able to maximise your claim by accounting for every activity for which you can receive relief, while also confirming that everything is compliant and risk-free.
For accounting periods that end on or before 31 March 2024 there are two HMRC schemes for claiming R&D Tax Credits: the SME R&D scheme and R&D Expenditure Credit (RDEC).
To qualify for the SME R&D scheme, a business generally needs fewer than 500 employees and a turnover of less than €100m or €86m net assets. Large companies and certain SMEs can claim RDEC.
A new merged RDEC-like scheme for all came into effect for accounting periods starting on or after 1 April 2024. There is also extra support available for loss-making SMEs that meet a 30% R&D intensity threshold through the ERIS scheme.
As well as R&D Tax Credits, the government offers a Patent Box scheme that allows companies to reduce their corporation tax rate on qualifying patented inventions or similar IP income to 10%.
For accounting periods starting on or after 1 April 2024, there is a new merged R&D tax relief scheme. This scheme will offer a standard credit rate of 20% for most companies. Loss-making SMEs heavily invested in R&D may still qualify for a slightly higher rate through ERIS. Find out more by reading our explainer: Everything you need to know about the merged R&D scheme in 2025.
– R&D Tax Credits provide an often-vital cash injection for businesses. To date, Leyton UK has helped thousands of clients successfully claim more than £1 billion in R&D tax relief.
– Our extensive industry, sector and tax expertise means we have a deep understanding of what HMRC regards as acceptable for claims.
– We match every client with highly qualified sector-specific and financial consultants to unlock the full benefit available.
– Our vast in-house resources mean that we are normally able to work with you to your deadlines.
– Our clients have access to LEYTON4ME – a way to digitise, streamline, secure and simplify your claim.
We have stringent compliance standards and processes in place to ensure that we secure the maximum financial benefits for our clients, while minimising risk.
Our financial consultants are FCA qualified, conduct extensive financial and business due diligence, and regularly engage with HMRC. Our in-depth sector and tax experience also significantly reduces risk for our clients. Our processes are overseen by our in-house GDPR and Compliance Officer and Senior Tax Lawyer.
While our enquiry rates remain exceptionally low, we also offer free HMRC enquiry defence for our clients.
You can find out more by reading our guide: A summary of HMRC’s Guidelines for Compliance for claiming R&D relief.
Our clear step-by-step process will help your organisation claim R&D Tax Credits for your innovative projects:
1. Introduction
Consultancy team introduction and key claim stakeholder identification. Basic R&D eligibility assessment and delivery timeline agreed.
2. Financial Discovery
Introduction to expenditure categories, R&D project expenditure data provision, financial document provision.
3. Technical Scoping
Review and discussion of all eligible projects, selection of key project(s) for claim substantiation (case study).
4. Claim Package
Compilation of technical and financial documentation, internal quality audit and resolution of queries.
5. Submission
Final documentation sign-off, tax benefit option agreement, detailed submission guidance and additional submission support.
For accounting periods starting on or after 1 April 2024 is a new merged R&D tax relief scheme. This scheme will offer a standard credit rate of 20% for most companies. Loss-making SMEs heavily invested in R&D may still qualify for a slightly higher rate through ERIS. Find out more by reading our explainer: Everything you need to know about the merged R&D scheme in 2025.
Are you developing a new process, a product or service, or perhaps improving an existing one? If so, there’s a good chance that your work may be eligible for tax relief.
You can find out more by reading our helpful article: What is an R&D project?
Eligible businesses can claim for R&D-related expenses, such as:
– consumables
– staff costs
– externally provided R&D staff (although there are overseas restrictions)
– subcontractors
– software, data and cloud computing costs
– clinical trial volunteers
– some indirect project costs related to R&D such as admin and maintenance
As part of our service, we’ll review your innovative projects to identify all eligible R&D expenses.
We’re here to help! Book a free meeting with our team and take the first step toward maximising your R&D tax opportunities.
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