Read end-to-end by a FundingAtlas editor against the official source.
Quick answer
A UK corporation tax relief for SMEs that resolve genuine scientific or technological uncertainty. Corporation tax relief for UK SMEs carrying out qualifying R&D. Rules and rates changed for accounting periods on or after 1 April 2024 — check current guidance before relying on historical rates. It is aimed at UK SMEs whose work meets HMRC's definition of qualifying R&D. Eligibility typically requires UK company carrying out qualifying R&D (resolving scientific or technological uncertainty). Rates
Funding amount
Varies
Region
United Kingdom
Stage
Any stage
Provider
HMRC
Advisor view
This relief rewards evidence, not enthusiasm. The strongest claims are built throughout the year — contemporaneous technical narratives, time-tracked staff costs, and a clear line between qualifying R&D and routine work.
Frequently asked questions
- What is R&D Tax Relief for SMEs?
- R&D Tax Relief for SMEs is a UK corporation-tax relief on qualifying R&D expenditure incurred by SMEs. Qualifying companies receive a cash credit or reduced tax bill on costs that meet the advance-and-uncertainty test.
- Who can claim?
- UK companies that meet the SME definition under the R&D regime and carry out qualifying R&D — projects that seek a scientific or technological advance and overcome technological uncertainty.
- What costs typically qualify?
- Staff costs of those engaged in qualifying R&D, certain subcontractor and externally-provided worker costs, consumables, software and a defined set of categories per HMRC guidance.
- What does HMRC mean by 'technological uncertainty'?
- Uncertainty that a competent professional in the field cannot resolve from publicly available knowledge — i.e. genuinely needing experimental work to determine how to achieve the advance.
- What does an enquiry focus on?
- Typically the technical narrative — the description of the advance and the uncertainty — and whether costs are correctly categorised. Contemporaneous documentation is the single strongest defence.
- How do grants interact with R&D Tax Relief?
- Notifiable state-aid grants can move qualifying costs out of the SME regime and into RDEC. Subsidy treatment is a major part of the technical analysis.
- Why do claims fail?
- Most rejections come from weak technical narrative, claiming routine development, ignoring subsidy interaction, late retrospective time-tracking, or claiming costs that clearly fall outside qualifying categories.
- How do we file?
- The claim is included in the corporation-tax return (CT600) with an R&D schedule. Companies often use a specialist adviser to prepare the technical narrative and cost analysis.
- How has the regime changed?
- Rates and rules have changed materially in recent fiscal events. Always confirm the current regime, rates and thresholds with a specialist before claiming.
- Where can I read official guidance?
- The official guidance is on gov.uk under the R&D Tax Relief pages. This is not tax advice — speak to a specialist before claiming.
Who it's for
UK SMEs whose work meets HMRC's definition of qualifying R&D.
Usually too early when
Advisor signal
You have not yet incurred qualifying R&D expenditure, do not have a UK-resident company in scope, or cannot evidence the scientific or technological uncertainty being resolved.
Eligibility
UK company carrying out qualifying R&D (resolving scientific or technological uncertainty). Rates and rules differ for loss-making R&D-intensive SMEs and for the merged scheme.
Evidence you'll need
Technical narrative against the BEIS/DSIT definition, project cost breakdown, additional information form (mandatory since Aug 2023).
Application timeline
Claimed via the Company Tax Return; HMRC may enquire.
Common reasons applications fail
Claim not meeting the technological-uncertainty test, weak cost apportionment, missing additional information form.
What improves your odds
A competent professional sign-off, a written technical narrative per project, separated qualifying and non-qualifying costs, and a clear audit trail.
Typical successful applicant
A UK company carrying out genuine scientific or technological R&D, with a competent professional and a finance function that can isolate qualifying costs.
Common misconceptions
Routine software development, market research and aesthetic design generally do not qualify. The statutory test is an advance in the field, not in your company.
What happens next
Submit the claim with the Company Tax Return; HMRC processes or opens an enquiry.
What comes next
File the claim with a full technical and financial report, retain working papers for six years, and assume HMRC may open an enquiry.
Funding context
Often used alongside grant funding and equity. Notified state aid affects which R&D relief regime applies, and the rules vary by company size and R&D intensity.
Related routes
- R&D Tax Relief vs Innovate UK Smart Grants
- Patent Box vs R&D Tax Relief
- Innovation Loans vs R&D Tax Relief
- RDEC vs ERIS (R&D Intensive SME)
- Should I claim R&D Tax Relief or apply for a grant?
- Patent Box or R&D Tax Relief?
- Which R&D funding route is best?
- Do I qualify for RDEC under the new regime?
- R&D Tax & Reliefs Pathway
- Innovation Funding Pathway
- R&D Expenditure Credit (RDEC)
- Patent Box
- Innovate UK Smart Grants
Objectives
Regions