Merged Scheme R&D Credit Calculator
From April 2024, the SME and RDEC schemes merged into a single scheme for most companies. Calculate your potential R&D tax credit under the new merged regime.
Gross R&D Credit
Tax on Credit
Net Cash Benefit
Calculation Breakdown
| Step | Amount | Explanation |
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R&D Intensive Company Calculator
Loss-making SMEs spending 40% or more of their total expenditure on R&D can claim the enhanced 27% payable credit rate.
R&D Intensity
Credit Rate
Cash from HMRC
Calculation Breakdown
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Qualifying R&D Costs Calculator
Enter your costs by category to calculate your total qualifying expenditure. Some costs only partially qualify - the calculator applies the correct percentages.
Total Qualifying Expenditure
What Doesn't Qualify?
- Capital expenditure (equipment, machinery)
- Rent and rates
- Marketing and promotion costs
- Work subcontracted to connected parties beyond limit
- Costs already covered by grants or subsidies
R&D Tax Credits Eligibility
Check whether your company and R&D projects qualify for tax relief.
Company Requirements
- UK limited company subject to Corporation Tax
- Actively carrying on a trade
- Owns the intellectual property or bears financial risk
- Not claiming grants for the same R&D costs
- Projects must involve genuine technological uncertainty
R&D Intensive Criteria (27%)
- Company must be loss-making in the period
- R&D spend must be 40%+ of total expenditure
- Must meet SME definition (under 500 employees)
- Turnover under €100m or assets under €86m
- No grants or subsidies for the R&D
Example Qualifying R&D Activities
- Developing new software products, platforms or algorithms
- Creating new materials, formulations or compounds
- Designing innovative manufacturing processes
- Engineering solutions to overcome technical challenges
- Building prototypes to test scientific theories
- Improving existing products with new technology
UK R&D Tax Credit Rates 2025
| Scheme | Credit Rate | Net Benefit (Profitable) | Cash (Loss-making) |
|---|---|---|---|
| Merged Scheme | 20% | ~15% (after 25% CT) | Up to 20% |
| R&D Intensive | 27% | N/A (loss-making only) | 27% cash |
Merged Scheme Benefits
- 20% above-the-line credit
- Credit shown in P&L before tax
- Visible to stakeholders and investors
- Can be surrendered for cash if loss-making
- Applies from 1 April 2024
How to Claim
- Include claim in Corporation Tax return (CT600)
- Submit Additional Information Form to HMRC
- Claim within 2 years of accounting period end
- Provide detailed project descriptions
- Breakdown costs by qualifying category
R&D by Industry Sector
Technology & Software
- AI and machine learning development
- Cybersecurity innovations
- Cloud infrastructure solutions
- Mobile app development with novel features
- Data processing algorithms
Manufacturing & Engineering
- Process automation and robotics
- New material development
- Product miniaturisation
- Energy efficiency improvements
- Quality control innovations
Life Sciences & Healthcare
- Drug discovery and development
- Medical device innovation
- Diagnostic tools and methods
- Clinical trial methodologies
- Biotechnology processes
Construction & Architecture
- Sustainable building materials
- Modular construction methods
- Building Information Modelling (BIM)
- Energy-efficient systems
- Structural engineering innovations
R&D Tax Credit Claim Process
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1. Identify R&D ProjectsReview all projects seeking advances in science or technology. Document technological uncertainties and how they were addressed.
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2. Calculate Qualifying ExpenditureGather costs: staff time (apportioned to R&D), subcontractors (65%), consumables, software, cloud computing. Exclude non-qualifying costs.
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3. Prepare Technical NarrativeWrite project descriptions explaining the baseline, advance sought, uncertainties faced, and how they were resolved or attempted.
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4. Complete Additional Information FormFrom 8 August 2023, submit AIF before or with your claim. Include PAYE data, agent details, and project summaries.
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5. Submit CT600 ClaimInclude R&D claim in Corporation Tax return. Amend previous returns if claiming for prior periods (up to 2 years back).
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6. HMRC ProcessingHMRC reviews claim. Processing typically takes 4-8 weeks for straightforward claims. Enquiries may extend timeline.
How R&D Tax Credits Calculator Works
This calculator applies the latest 2025/26 HMRC tax rates to estimate your tax position. The UK uses a progressive tax system where different portions of your income are taxed at different rates. Only income above the tax-free personal allowance is subject to tax, and each band applies only to the slice of income within that range.
Understanding your tax liability helps you make informed decisions about pension contributions, salary sacrifice, gift aid donations, and other tax-efficient strategies. This tool provides an estimate based on standard tax codes, though your actual position may differ if you have multiple income sources or special circumstances.
Key Information for 2025/26
The personal allowance is £12,570 (frozen until 2028). Basic rate: 20% on income from £12,571 to £50,270. Higher rate: 40% on income from £50,271 to £125,140. Additional rate: 45% on income above £125,140. The personal allowance reduces by £1 for every £2 earned above £100,000, creating an effective 60% rate between £100,000 and £125,140.
Example Calculation
On £42,000 annual income: £12,570 is tax-free, then £29,430 is taxed at 20% = £5,886 income tax. National Insurance adds £2,354 at 8% on earnings above £12,570. Total deductions: £8,240, leaving take-home pay of £33,760 per year or £2,813 per month.
Source: Based on official HMRC 2025/26 tax rates. Last updated March 2026.
Frequently Asked Questions
R&D tax credits are a UK government incentive that allows companies to claim tax relief for qualifying research and development expenditure. From April 2024, most companies use the merged R&D scheme with a 20% above-the-line credit. Loss-making R&D intensive companies (40%+ R&D spend) can claim a 27% payable credit. Companies can either reduce their Corporation Tax bill or receive a cash payment from HMRC.
Under the merged scheme (from April 2024), profitable companies receive an effective benefit of approximately 15% of qualifying R&D spend after Corporation Tax on the credit. Loss-making companies can receive up to 20% as a payable credit. R&D intensive loss-making SMEs can claim 27%, meaning £100,000 of qualifying spend could generate £27,000 in cash from HMRC.
Qualifying costs include: staff costs (salaries, employer NI, pension contributions), externally provided workers (65% qualifying), subcontractor costs (65% qualifying), consumable materials used in R&D, software licences directly used for R&D, cloud computing costs, and data costs. Capital expenditure, rent, and marketing costs do not qualify.
An R&D intensive company is a loss-making SME where qualifying R&D expenditure represents 40% or more of total company expenditure. These companies can claim the enhanced rate of 27% as a payable credit from HMRC, compared to 20% for other companies. This higher rate is designed to support innovative startups and companies investing heavily in research.
Professional Advice: Common R&D Tax Credit Claim Mistakes to Avoid
HMRC has significantly increased scrutiny of R&D tax credit claims since 2023, with compliance checks rising sharply. The most common mistake is failing to adequately describe the technological uncertainty your project sought to resolve. Simply stating that work was innovative or novel is insufficient; you must explain what specific scientific or technological advance was attempted and why a competent professional in the field could not have easily resolved it.
Another frequent error is including costs for commercially available software customisation or routine data analysis, which do not qualify as R&D activity. From April 2024, the merged R&D scheme requires all claims to include a named senior officer of the company and a brief description of each qualifying project. Claims must be submitted within two years of the end of the accounting period in which the expenditure was incurred, so timely record-keeping of staff time, subcontractor costs, and consumable materials is essential.
Pro Tips for Accurate Results
- Double-check your input values before calculating
- Use the correct unit format (metric or imperial)
- For complex calculations, break them into smaller steps
- Bookmark this page for quick future access
Understanding Your Results
Our R And D Tax Credits Calculator provides:
- Instant calculations - Results appear immediately
- Accurate formulas - Based on official UK standards
- Clear explanations - Understand how results are derived
- 2025/26 updated - Using current rates and regulations
Common Questions
Is this calculator free?
Yes, all our calculators are 100% free to use with no registration required.
Are the results accurate?
Our calculators use verified formulas and are regularly updated for accuracy.
Can I use this on mobile?
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Official Sources & References
Data verified against official UK government sources. Last checked April 2026.