R&D Tax Credit Eligibility Checklist: Does Your UK Business Qualify?

Does Your Business Qualify for R&D Tax Credits?

If your business has spent time and money solving a technical problem that wasn't easily solvable, you could be eligible for R&D tax credits. The question is whether HMRC would agree.

This R&D tax credit eligibility checklist walks through the core conditions, the qualifying costs, and the common pitfalls that trip up otherwise valid claims. It covers the merged R&D scheme that applies to accounting periods starting on or after 1 April 2024, plus the enhanced R&D Intensive Scheme (ERIS) for loss-making companies where R&D spend exceeds 30% of total costs.

We are ICAEW qualified accountants based in the UK. We deal with R&D claims across sectors: software consultancies in Manchester, engineering firms in Birmingham, food manufacturers in Leeds, and tech startups in Shoreditch. The principles below apply to all of them.

Step 1: Does Your Project Meet the Definition of R&D?

HMRC uses a specific definition of R&D for tax purposes. It comes from the BEIS Guidelines (Department for Business, Energy and Industrial Strategy). Your project must aim to achieve an advance in science or technology overall, not just for your business.

Three conditions must all be met:

• An advance - the project sought to make a genuine improvement to the existing knowledge or capability in your field. It is not enough to simply apply existing technology in the normal way. You had to overcome something that wasn't already known or readily deducible.
• Scientific or technological uncertainty - at the start of the project, it was not obvious to a competent professional in the field how to achieve the advance. If the answer was already known, even if you did not personally know it, that is not R&D.
• Systematic work - you carried out a planned, methodical process of research, testing, modelling, or iteration. Hacking at a problem without a structured approach rarely qualifies.

Example that qualifies: A small engineering firm in Bristol spent 14 months developing a new type of composite material for marine environments. They tested 23 different resin combinations, none of which worked initially. The final material was novel and the process was documented throughout. That qualifies.

Example that does not qualify: A web agency in Birmingham built a standard ecommerce site using Shopify. They customised the theme and integrated a payment gateway. That is normal software development. No technological advance was sought.

Step 2: Was the Project in a Qualifying Field?

R&D tax credits cover advances in science or technology. They do not cover advances in the arts, humanities, social sciences, or business models.

Qualifying fields include (but are not limited to):

• Engineering and manufacturing
• Software development and IT
• Life sciences, pharmaceuticals, and medical devices
• Materials science and chemistry
• Agriculture, food science, and biotechnology
• Environmental technology and energy

If your project involved developing a new algorithm to solve a data processing bottleneck, that is technology. If you developed a new customer loyalty programme, that is not. HMRC draws this line firmly.

Step 3: Which Costs Qualify Under the Merged Scheme?

From 1 April 2024, the old SME and RDEC schemes were merged into a single R&D tax relief scheme for all companies. Qualifying costs are now broadly the same for everyone, though the rates of relief differ depending on whether your company is profit-making or loss-making.

Qualifying costs under the merged scheme:

• Staff costs - salaries, wages, employer's pension contributions, and employer's Class 1 NIC for employees directly involved in R&D. Bonuses and share-based payments are excluded.
• Externally provided workers (EPWs) - agency workers and freelancers contracted through a third party. You can claim 65% of the relevant costs.
• Consumable items - materials, water, fuel, and power used directly in the R&D. Software used directly for R&D also qualifies (a change from the old rules).
• Subcontracted R&D - if you pay a third party to carry out R&D on your behalf, you can claim 65% of the payment. If you are the subcontractor, you cannot claim for that work (the client claims instead).
• Contributions to independent R&D - payments to certain qualifying bodies (e.g., universities, charities, research organisations) for R&D activity.

Costs that do not qualify: capital expenditure, land, patent costs, training, marketing, routine data collection, and overheads like rent and utilities (unless metered and directly attributable).

For a profit-making company, the merged scheme gives a 20% taxable credit (effectively reducing your corporation tax bill). For a loss-making company, you can surrender losses for a payable credit at a rate of 10% for most companies, or 14.5% for R&D-intensive loss-making companies (ERIS).

R&D Intensive Scheme (ERIS)

If your company is loss-making and your qualifying R&D spend is 30% or more of your total costs, you qualify as R&D-intensive. You can claim a payable credit of 14.5% on the surrenderable loss, instead of 10%.

The 30% threshold is measured on a three-year rolling average. If you are a new company with fewer than three years of data, HMRC uses the available period.

This matters most for early-stage tech and life sciences companies that are burning cash on R&D before generating revenue.

Step 4: Does Your Company Structure Affect the Claim?

R&D tax credits are a company-level relief. Sole traders and partnerships cannot claim them. If you are a sole trader or partnership doing R&D, you should speak to us about whether incorporating would unlock this relief.

For limited companies, the claim is made on the CT600 (corporation tax return). You must also submit the R&D Additional Information Form (AIF) digitally, before or alongside the CT600.

Associated companies affect the R&D thresholds. If you control multiple companies, HMRC treats them as associated. That reduces the profit threshold for the small profits rate of corporation tax and can affect the R&D credit calculation. Check your group structure before submitting.

Step 5: What Does HMRC Look For in a Claim?

HMRC has significantly increased compliance activity on R&D claims in the last two years. They are looking for evidence that:

• The project genuinely sought an advance in science or technology.
• The uncertainty was genuine, not just a lack of knowledge on your part.
• The costs claimed are directly attributable to the R&D.
• The narrative in the AIF is technically accurate and consistent with the financial data.

If HMRC opens an enquiry, they will ask for supporting documents: project plans, technical specifications, test results, meeting notes, timesheets, and cost breakdowns. If you cannot produce these, the claim may be denied or reduced.

Practical tip: Keep a project log as you go. A simple spreadsheet tracking dates, activities, staff hours, and costs is far better than trying to reconstruct the work after the year-end.

Step 6: Common Mistakes That Kill Claims

These are the most common reasons HMRC rejects or challenges R&D claims:

• Claiming for routine development. If a competent professional in your field could have done it without experimentation, it is not R&D.
• Including non-qualifying costs. Overheads, rent, marketing, and patent costs are not qualifying. Do not include them.
• Poor documentation. A vague AIF narrative with no technical detail is a red flag. HMRC wants to see the problem, the uncertainty, and the method.
• Claiming for subcontracted work when you are the subcontractor. Only the client can claim for R&D they commission.
• Missing the deadline. R&D claims must be made within 12 months of the company's corporation tax return filing date. For most companies, that is 21 months after the year-end. Miss it and the relief is lost.

Step 7: Should You Use a Specialist?

R&D claims are not DIY territory for most businesses. The technical narrative must be precise. The cost allocation must be defensible. And the compliance risk is real: HMRC is challenging more claims than ever, particularly in software and digital sectors.

If your claim is straightforward (a single project, a few staff, clear costs) and you have strong internal records, you might handle it yourself. But if you are unsure about any of the conditions above, speak to a qualified accountant who specialises in R&D.

We handle R&D claims for businesses across the UK. If you want to run through your specific situation, get in touch. We will tell you honestly whether the claim is worth making.

Summary Checklist

Print this or bookmark it. Tick each box before you submit a claim:

• Your project sought an advance in science or technology.
• Scientific or technological uncertainty existed at the start.
• You carried out systematic, planned work.
• The project is in a qualifying field (engineering, software, life sciences, etc.).
• You have identified qualifying costs: staff, EPWs, consumables, subcontractors, or contributions.
• Your company is a limited company (not a sole trader or partnership).
• You have supporting documentation ready.
• You are within the 12-month claim window from the filing date.

If you ticked all eight, you likely have a valid claim. If you ticked six or seven, review the gaps. If you ticked fewer than six, you probably do not qualify.

For more detail on the rules, read our R&D tax credits guide. If you need to check your company structure, see our incorporation services. And if you are ready to proceed, contact us to start the claim process.