IR35 Contract Template UK — Outside IR35 Services Agreement
Determining whether your contract sits inside or outside IR35 is one of the most financially significant decisions a UK contractor can face, yet many rely on vague or generic agreements that leave them exposed to HMRC investigation. A properly drafted outside IR35 services agreement establishes the true nature of your working relationship under Chapter 10 of the Income Tax (Earnings and Pensions) Act 2003, demonstrating genuine business-to-business engagement rather than disguised employment. Key indicators such as substitution rights, lack of mutuality of obligation, and financial risk must be reflected accurately in the contract wording — not just in practice. Without this alignment, even legitimate outside IR35 arrangements can unravel under scrutiny. Protect your personal service company and your income by generating a compliant, HMRC-aware IR35 contract template now.
Generate your IR35 Agreement free →Key clauses in a IR35 Agreement
Right of Substitution
This clause gives the contractor the genuine right to send a qualified substitute to perform the services in their place, without requiring the client's approval of the specific individual. Under IR35 case law established in cases such as Ready Mixed Concrete [1968] and reinforced by HMRC's own CEST tool guidance, a credible substitution right is one of the strongest indicators of self-employment and outside IR35 status.
Mutuality of Obligation Exclusion
This clause explicitly states that the client is under no obligation to offer work and the contractor is under no obligation to accept it, removing the continuous employment expectation that HMRC looks for when determining IR35 status. Mutuality of obligation is a key employment status test derived from case law including Carmichael v National Power [1999], and its absence is a critical marker of a genuinely independent contractor relationship.
Financial Risk and Control
This clause confirms that the contractor bears their own financial risk — including responsibility for rectifying defective work at their own cost and maintaining their own professional indemnity insurance — and operates without being subject to the client's day-to-day supervision or control. HMRC's employment status indicators under Chapter 10 ITEPA 2003 place significant weight on both financial risk and the degree of control exercised, making this clause essential for demonstrating a genuine outside IR35 position.
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Generate free →Frequently asked questions
Does having an outside IR35 contract guarantee I won't be caught by IR35?
No — HMRC can look beyond the written contract to assess the actual working practices under what is known as the 'hypothetical contract' test, as confirmed by Chapter 10 ITEPA 2003 and case law including Kickabout Productions v HMRC [2022]. If the day-to-day reality of your engagement resembles employment, HMRC may disregard your contract wording entirely. Your contract and working practices must align for a robust outside IR35 defence.
Who is responsible for determining my IR35 status since the 2021 off-payroll reforms?
Since the off-payroll working rules were extended to the private sector in April 2021 under Chapter 10 ITEPA 2003, the responsibility for determining IR35 status shifted from the contractor's PSC to the end client, provided that client is a medium or large business. Small companies as defined by the Companies Act 2006 are exempt, meaning contractors working with small clients retain responsibility for their own status determination. Your client must issue a Status Determination Statement (SDS) and you have the right to dispute it.
Can I use HMRC's CEST tool to confirm my contract is outside IR35?
HMRC's Check Employment Status for Tax (CEST) tool can provide a helpful indication and HMRC has committed to stand by its output provided the information entered is accurate and complete. However, CEST has been criticised in tribunal cases, including Alec Sharp v HMRC, for failing to adequately account for mutuality of obligation. A well-drafted outside IR35 contract reviewed alongside CEST gives you a stronger overall position than relying on either alone.
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.