IR35 Substitution Clause Template UK | Right of Substitution
Operating through a Personal Service Company exposes UK contractors to significant IR35 risk, particularly when HMRC scrutinises whether a genuine business-to-business relationship exists. Without a properly drafted substitution clause, HMRC may argue that personal service is required, pushing the engagement inside IR35 under Chapter 10 of the Income Tax (Earnings and Pensions) Act 2003. A robust Right of Substitution clause demonstrates that the client is contracting for a service, not an individual, which is one of the three key indicators HMRC examines during an IR35 status determination. This template provides a legally sound, HMRC-aware substitution clause that clearly establishes the contractor's right to send a qualified substitute, helping protect your outside-IR35 status and avoid unexpected tax liability. Generate your substitution clause now and strengthen your IR35 position today.
Generate your IR35 Agreement free →Key clauses in a IR35 Agreement
Right of Substitution
This clause explicitly grants the contractor the unconditional right to provide a suitably qualified substitute to perform the services in their place, without requiring the client's approval based on personal preference. Under IR35 case law, including Autoclenz Ltd v Belcher [2011] and HMRC's own Check Employment Status for Tax guidance, an unfettered substitution right is one of the strongest indicators of genuine self-employment and outside-IR35 status.
Substitute Approval Criteria
This clause defines the objective criteria against which a proposed substitute may be assessed, such as relevant qualifications, skills, or security clearance, ensuring the client's right to reject a substitute is limited to legitimate professional reasons. Restricting rejection to objective grounds prevents HMRC from arguing that the substitution right is a sham, which was a central issue in HMRC v Christa Ackroyd Media Ltd [2019] before the First-tier Tribunal.
Contractor Liability for Substitute
This clause confirms that the contractor remains fully responsible for remunerating the substitute and bears liability for the quality of work delivered, reinforcing that the client is not in a direct employment relationship with the substitute. Establishing this financial and operational responsibility between the contractor and substitute mirrors a genuine business relationship and supports the contractor's outside-IR35 position under Chapter 10 ITEPA 2003.
Generate your IR35 Agreement in 2 minutes
AI-powered. Jurisdiction-aware. No account required for your first contract.
Generate free →Frequently asked questions
Does a substitution clause alone guarantee I am outside IR35?
No single clause guarantees an outside-IR35 determination; HMRC and tribunals assess the overall working arrangement holistically across three key pillars: substitution, control, and mutuality of obligation. A substitution clause strengthens your position significantly, but it must reflect the reality of your engagement — HMRC can disregard a clause it considers a sham if the right has never been exercised or offered in practice. HMRC's Check Employment Status for Tax tool and cases like Kickabout Productions Ltd v HMRC [2022] confirm that contractual terms must align with actual working practices.
Can my client veto my substitute under a valid IR35 substitution clause?
A client may reject a proposed substitute, but only on objective, skills-based grounds such as insufficient qualifications, lack of required security clearance, or failure to meet defined technical criteria. If the client can reject a substitute simply because they prefer to work with you personally, HMRC is likely to view the substitution right as personal service in disguise, undermining your IR35 position. The First-tier Tribunal examined this principle closely in HMRC v Atholl House Productions Ltd, emphasising that the right must be genuine and commercially meaningful.
Should the substitution clause be in my contract with the client or with the agency?
If you engage through a recruitment agency, the substitution clause must appear in the contract between your PSC and the agency, as this is the document HMRC will scrutinise when assessing your status under the off-payroll working rules in Chapter 10 ITEPA 2003. It is equally advisable to include a corresponding clause in any contract between the agency and the end client, creating a consistent chain of documentation that reflects the same terms throughout the supply chain. Inconsistencies between the agency contract and the client contract can be used by HMRC to challenge the authenticity of the substitution right.
The information on this page is for general informational purposes only and does not constitute legal advice. Contracto generates AI-assisted contract templates — they are not a substitute for advice from a qualified solicitor. For high-value or complex engagements, always seek independent legal review.