Plio Resources
UK R&D tax relief resources
01 · Main guide
R&D Tax Credits Guide
Learn how UK R&D tax relief works, which projects and costs may qualify, what HMRC requires and how to prepare your claim step by step.Read → 02R&D Tax Relief Eligibility
Understand UK R&D tax relief eligibility, scientific and technological uncertainty, qualifying advances and the evidence HMRC expects.Read → 03R&D Claim Deadlines
Check UK R&D tax relief claim deadlines, notification rules, Additional Information Form requirements and HMRC's announced changes for 2027.Read → 04Qualifying R&D Expenditure
Learn which R&D costs may qualify for UK tax relief, including employees, contractors, software, materials and how to allocate shared costs.Read → 05Frequently Asked Questions
Find answers to common UK R&D tax relief questions about eligibility, qualifying costs, HMRC deadlines, Lister AI and preparing your own claim.Read → 06Claim R&D Tax Relief Yourself
Learn how to prepare your own UK R&D tax relief claim, what you can do without an advisor, when professional help may be useful and how Plio assists.Read → 07R&D Evidence Examples
Practical R&D evidence record templates for technical uncertainties, experiments, competent professionals, research references and cost allocation justifications.Read → 08Technological Uncertainty
Learn how to assess and document scientific or technological uncertainty using a technical baseline, research evidence, dates and competent professional reviews.Read → 09R&D Tax Relief Calculator Guide
Understand UK R&D tax relief calculations with worked merged RDEC and ERIS examples, taxable credits, surrenderable losses and payment restrictions.Read → 10Additional Information Form Guide
Prepare the HMRC R&D Additional Information Form with a field-by-field checklist, project selection examples, cost reconciliation and submission guidance.Read →Tax guidance is general information, not professional advice.