R&D Tax Relief and Credits: Eligibility, Rates and How to Claim

Innovation costs money. For UK‑based businesses developing new technologies or improving processes, research and development (R&D) tax relief can help reduce a significant part of the Corporation Tax bill. It’s designed to reward investment in innovation and to make sure companies get more value from their creative work through the tax system,

R&D tax relief was introduced in the 2000s by the UK government for small & medium sized enterprises (SMEs) who were focusing on innovation in technology, processes and services.

But many businesses are still unaware of this relief or either confused that they qualify for the R&D relief so we are here to deep dive into this relief and help you save your money.

What are R&D tax credits?

At its core, research and development tax relief is a set of UK government incentives that let companies either reduce their corporation tax bill or claim cash back based on qualifying research and development expenditure. It’s not just a deduction, often it becomes a cash benefit.

These incentives come in the form of tax relief and cash credits.

• Tax relief: Reduces the amount of profit that’s subject to corporation tax.
  
• R&D tax credits: R&D tax credits: cash payments that can be made to loss‑making companies or those with little or no Corporation Tax to pay.

What Qualifies as R&D tax credits?

This is the point where most of the companies go wrong. Many companies think that if they are registered in the UK and liable for corporation tax and working on routine upgrades or day-to-day improvements they are eligible for research & development tax relief but thats not the case.

According to HMRC guidance, a project qualifies for R&D tax relief only if it seeks an advance in science or technology and involves scientific or technological uncertainty that a competent professional cannot easily resolve.

HMRC is clear that innovation is not limited to laboratories. We consider innovation in all sectors including software development, engineering, construction methods, digital platforms, manufacturing processes, and architectural design as long as it is solving a technical uncertainty. 

So ask yourself:

• Were you trying to build or develop something that hadn’t been done in that way before?
  
• Did your team face technical challenges where the outcome was uncertain at the start?
  
• Were you experimenting, testing, or iterating because the solution wasn’t obvious?

If the answer is yes, there’s a strong chance your project could qualify for R&D tax relief or R&D tax credits.

How can a business qualify for R&D tax relief?

R&D tax relief isn’t just for scientists, labs, or tech giants.

If your business builds, improves, adapts, or fixes things where the solution wasn’t obvious at the start, you’re already closer than you think.

Here are some points that can help you decide whether the activities you are doing in your business qualify for R&D tax relief.

1. Seeking an Advance in Science or Technology

This doesn’t mean inventing something the world has never seen before.

An “advance” can be:

• Creating a new product or system
  
• Making something work in a way it hadn’t worked before

What matters is this:
You were trying to move knowledge or capability forward, not just follow a manual.

For example:

• A software team trying to overcome performance limitations
• An engineering firm developing a new manufacturing method
• A digital business building custom functionality where no off-the-shelf solution existed

If the answer wasn’t already available on Google, you’re on the right track.

2. Addressing Scientific or Technological Uncertainty

HMRC isn’t interested in commercial uncertainty (like “Will customers buy this?”).
They care about technical uncertainty.

Ask yourself:

• Did we know how to achieve this at the start?
• Were there multiple possible approaches, none guaranteed to work?
• Did competent professionals genuinely need to experiment, test, or iterate?

If your team had to try things that might not work, discard approaches, or rethink the solution halfway through, that’s uncertainty.

Routine upgrades, cosmetic changes, or standard implementations usually don’t qualify.
But problem-solving does.

3. Having Evidence (Without Overthinking It)

You don’t need a lab notebook or academic papers.

But you do need to show:

• What problem you were trying to solve
• Why it wasn’t straightforward
• What work was carried out
• How the uncertainty was addressed (even if the project didn’t fully succeed)

This evidence often already exists:

• Project plans
• Design documents
• Technical notes
• Git commits
• Internal emails or meeting notes

HMRC isn’t expecting perfection.
They’re looking for credibility and clarity.

If you can explain the story clearly, you’re already doing better than most rejected claims.

4. Work Carried Out by Competent Professionals

This sounds intimidating, but it really isn’t.

A “competent professional” is simply someone with:

• Relevant experience
  
• Appropriate qualifications or practical expertise
  
• The ability to understand and tackle the technical problem
  

They don’t need PhDs.
They don’t need academic titles.

If your developers, engineers, designers, or technical leads were capable professionals making informed decisions, this condition is usually met.

What R&D Tax Relief Schemes Are Available?

In the UK, the R&D tax landscape has changed in recent years, but the key schemes are:

Merged Scheme (from April 2024)

This is now the main framework most companies use. It replaced the older SME and RDEC schemes and applies to most accounting periods starting after April 2024.

The relief is given as a tax credit worth roughly 20% of qualifying expenditure — known as the research and development expenditure credit.

Loss-making R&D Intensive Scheme

For companies with large proportions of qualifying R&D expenditure, this can deliver a higher refundable credit of approximately 126.97% of qualifying spend (after tax).

Previous SME and RDEC schemes still matter for historical periods, but the merged approach is the rule today.

How to Submit R&D Claims?

If you’re planning to claim R&D tax relief or a research and development expenditure credit for accounting periods starting on or after 1 April 2023, you may need to submit a claim notification form before you even file the actual claim.

This applies if:

• It’s your first time claiming, or
• You haven’t claimed in the last three years.

In those cases, HMRC expects advance notice within what’s called the “claim notification period.” That deadline is linked to your company’s financial year (your period of account) and the specific accounting period covered by your Corporation Tax return.

It sounds technical  and it is but the consequence is simple:

If you miss the notification window, your R&D tax credits claim becomes invalid for that period. No appeal to the quality of your innovation. No second chances because the project was genuine.

So before you prepare numbers or draft technical reports, make sure you’re allowed to claim in the first place. Sometimes compliance isn’t about complexity,  it’s just about timing.

Which Costs Qualify for R&D Tax Relief?

First, you need to identify and properly track the costs linked to your R&D activities. The clearest costs are those directly connected to the qualifying work, the people building, testing, designing, solving and experimenting.

But it doesn’t stop there.

Some indirect costs can also qualify. For example, recruitment fees for hiring R&D staff. The key test is whether the cost supports the qualifying R&D activity.

There are two important ground rules:

• The costs must be revenue expenses (normal business expenses that are tax deductible).
• They must not be capital costs.

So if you’ve spent money on plant, machinery or buildings, those amounts should not go into your R&D tax relief claim. Instead, you would normally look at capital allowances. There is a 100% first-year deduction called Research & Development Allowances (RDA) that may apply to certain capital expenditure.

The Most Common Qualifying Costs

In practice, the largest portion of most R&D claims is staff costs.

This typically includes:

• Salaries
• Employer National Insurance Contributions (NIC)
• Employer pension contributions

If your team spent time working on qualifying R&D, the proportion of their time spent on that work can usually be included.

Other time-based costs may also qualify, such as:

• Certain subcontractor costs
• Group company recharges for R&D staff

Then there are non-time-based costs, which often surprise people. These can include:

• Consumables used in the R&D process
• Utilities such as energy directly used in R&D
• Software licences
• Cloud computing costs
• Data feeds

If the cost exists because the R&D activity exists, it’s worth reviewing.

Location Now Matters

There’s another important change to be aware of.

For accounting periods starting on or after 1 April 2024, under the new merged R&D scheme, overseas costs will generally no longer qualify, except in limited circumstances.

So if your R&D work is carried out outside the UK, you’ll need to review eligibility carefully. Where the work is performed now plays a much bigger role in determining what can be included.

How R&D Tax Relief Is Calculated Under the Merged Scheme (and Remaining RDEC Claims)

Once your research and development expenditure credit has been calculated, it doesn’t just land in your bank account the next day.

There’s a structured process HMRC follows.Here’s how it works in practice.

Step 1: Offset Against Corporation Tax

First, the gross R&D credit is used to reduce any Corporation Tax due for that accounting period.

So if your company owes Corporation Tax, the credit is applied there first.

Step 2: Calculate the Net Credit (After Tax)

The R&D credit itself is taxable. That means HMRC only pays out the net amount, after accounting for Corporation Tax.

If, after reducing your Corporation Tax bill, there’s still credit left  but it exceeds the net-of-tax amount  that excess isn’t lost.

It’s simply carried forward to future periods.

Step 3: Apply the PAYE and NIC Cap

This is where many businesses get surprised.

Any payable credit is subject to a cap linked to the company’s PAYE and NIC payments.

Under older rules (before 1 April 2024), the cap was based only on PAYE and NIC paid for R&D staff.

Under the current merged scheme rules, the cap is based on a multiple of the company’s total PAYE and NIC paid.

If your credit exceeds this cap, the surplus doesn’t disappear. It’s carried forward to use in future accounting periods.

Step 4: Offset Against Corporation Tax in Other Periods

If there’s still credit remaining, it can be allocated against Corporation Tax liabilities from other accounting periods.

This helps if you have outstanding tax from previous years.

Step 5: Group Relief (Optional)

If you’re part of a group of companies, you can choose to surrender the remaining credit to another group company.

That company can then use it against its own tax liability.

This step is optional. It gives flexibility, but it’s not mandatory.

Step 6: Offset Against Other Tax Liabilities

Any remaining credit is then automatically applied against other outstanding taxes owed by the claimant company.

For example:

• VAT
• PAYE
• Other overdue HMRC balances

You don’t need to request this, HMRC applies it automatically.

Step 7: Cash Payment

If there’s still credit left after all of that, the remaining balance can finally be paid directly to the company.

That’s the part most businesses focus on.

But as you can see, the system is designed to clear down tax liabilities first before releasing cash.

Capping Relief for Loss-Making Companies (Short Explanation)

If your company is loss-making and claiming a payable R&D tax credit, there’s a limit on how much cash HMRC will actually pay out. This is known as the PAYE/NIC cap.

Under the current merged scheme (and the R&D-intensive loss-making scheme), the cap is:

£20,000 + 300% of your company’s total PAYE and NIC liability for the period.

So the more UK payroll you have, the higher your potential payable credit.

However, some companies are exempt from this cap.

You won’t be restricted if:

• Your employees are creating, preparing to create, or actively managing Intellectual Property (IP), and
  
• You spend no more than 15% of your qualifying R&D costs on subcontracting to connected parties or using externally provided workers from connected parties.

One final detail:
If your accounting period is shorter or longer than 12 months, the cap is proportionally adjusted.

It’s a technical rule but an important one, especially for early-stage or scaling businesses relying on cash credits.

How Reflex accounting helps in R&D Tax reliefs?

Many companies leave money on the table because they’re unsure what counts as R&D, struggle to track costs properly, or worry about triggering HMRC questions. Others try to do it themselves and end up over-claiming, which can backfire. At Reflex Accounting, we take the stress out of it, we help identify the work that truly qualifies, calculate costs accurately, and prepare clear claims that HMRC will accept. That way, you get the relief you deserve without the risk or confusion.

• We review your projects against HMRC’s criteria (advance in science/technology, technical uncertainty, competent professionals).
• We analyse staff time, subcontractors, software, cloud, data and consumables linked to R&D.
• Work with your technical team to document the problem, uncertainty, approach and outcomes in plain English.
• Apply the merged R&D scheme and enhanced R&D‑intensive relief correctly.
• Support you if HMRC raises queries, with clear working papers and supporting documentation.
• Help you put simple systems in place to track R&D activity, time and costs during the year.

If you’d like specialist support with your next R&D claim, you can reach the Reflex Accounting team here:
https://reflexaccounting.co.uk/contact-us/

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