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Accounting & Finance
Guide
UK R&D Tax Knowledge & Insights
Expert guidance from our R&D tax specialists covering HMRC legislation, qualifying expenditure, claim preparation, enquiry support and real-world case studies.
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The Alexander Clifford Knowledge Library is the central resource for UK R&D tax relief — curated articles, HMRC guidance summaries, claim preparation advice and sector-specific insights written by our specialist consultants.
Whether you are preparing your first claim, responding to an HMRC enquiry or staying ahead of legislative changes, this hub brings together practical guidance in one place.
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The articles our specialists recommend every visitor reads first.
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162+ free resources on R&D tax relief — guides, updates and specialist insights.
Accounting & Finance
Guide
10 valid reasons for changing your companies financial tax year end with HMRC
R&D Tax Relief
Guide
I’ve never claimed R&D tax relief before. What’s the end-to-end claim process?
HMRC Enquiries
Guide
I submitted an R&D claim and received an enquiry letter: What should I do and what should I avoid?
Claim Process
Guide
What HMRC is trying to learn from the Additional Information Form (AIF)
Eligibility
Expert Insight
Can failed R&D projects qualify for R&D tax relief?
R&D Tax Relief
Expert Insight
Why is contemporaneous documentation essential for R&D tax credit claims?
R&D Tax Relief
Guide
Who benefits most from the ERIS scheme?
Eligibility
Technical Explainer
What is meant by ‘capability’ in UK R&D tax credit claims?
R&D Tax Relief
Technical Explainer
Understanding connected and unconnected company rules in UK R&D tax relief
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Free Resource
2026 UK R&D Tax Guide
Download our comprehensive guide covering eligibility, qualifying costs, claim preparation and HMRC compliance — updated for the current tax year.
- Step-by-step claim preparation checklist
- Qualifying expenditure explained in plain English
- HMRC compliance requirements for 2026
- Common mistakes that trigger enquiries
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Ready to explore your R&D tax relief options? Speak with one of our specialist consultants for a free, no-obligation review of your claim potential.
R&D Tax Credit Calculator
R&D Tax Credit Calculator
Is your company registered in the UK?
Only UK companies paying Corporation Tax can claim R&D tax credits
Unfortunately, only UK-registered companies are eligible for R&D tax credits. If you are considering UK incorporation, we can advise you.
Is your company currently profitable?
This determines whether you receive tax relief or a cash credit
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Include staff costs, materials, software, and subcontractors
£100,000
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- This amount is only an estimate — actual claim may vary*
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