Subcontractor Rules and Contract Risk: Who Holds the Right to Claim Under Merged Rules?
At a glance
One of the most complex changes introduced under the Merged R&D Scheme relates to contracted-out R&D. In supply-chain industries—such as commercial construction, contract manufacturing, and software engineering—confusion often arises over whether the main client or the subcontractor has the legal right to claim tax relief on a project.
Understanding these rules is essential to structuring commercial contracts correctly and avoiding duplicate claims that trigger HMRC inquiries.
The Core Rule: Who Intended the R&D to Occur?
Under the Merged Scheme framework, the right to claim R&D tax relief generally belongs to the party that intended and contracted for the R&D to be carried out, provided they initiated the project requirements.
Client Specifies Need for R&D in Contract Terms
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Client Claims R&D Relief (Main Contractor / Subcontractor Cannot Claim)
VS.
Subcontractor Encounters Unplanned Technical Barrier during Standard Work
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Subcontractor Claims R&D Relief for Overcoming Uncertainty
Scenarios Matrix: Determining Who Claims
Commercial Scenario | Who Holds the Claim Right? | Key Legal / Commercial Factor |
Scenario A: Client contracts an engineering firm to develop a novel prototype from scratch. | The Client | The contract explicitly calls for R&D activity to solve a known technical gap. |
Scenario B: Client hires a contractor to build a standard building. The contractor encounters unstable soil and must design a new piling system. | The Contractor | The client contracted for a standard build; the contractor encountered and solved an unexpected R&D challenge. |
Scenario C: A commercial firm hires an external UK developer to write custom software algorithms under their technical direction. | The Main Business | The developer is operating as a contractor; qualifying UK contractor costs are claimed by the business at 65%. |
Overseas Subcontractor Restrictions
A critical change under the modern R&D regime is the restriction on overseas subcontractor expenditure. Subject to narrow exceptions (such as extreme geographical or environmental conditions that cannot be replicated in the UK), subcontractor costs paid to non-UK entities are excluded from qualifying expenditure.
Best Practices for Commercial Contracts
To protect your R&D claim eligibility, review your customer and vendor agreements:
- Clarify R&D Intent in Contracts: Explicitly state in contract documentation whether a project involves commissioned R&D.
- Track Subcontractor Location: Ensure external contractors record where their work is physically performed to satisfy UK geographic restrictions.
- Maintain Intellectual Property Records: Keep clear records of who retains the IP rights and technical risk associated with project deliverables.
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