UK IR35 Off-Payroll Working Rules for Contractors 2026
How the UK off-payroll working rules determine whether a contractor providing services through a personal service company or other intermediary should be taxed broadly like an employee.
Key Statutory Takeaways
Statutory Rules & Core Thresholds
Medium/large client test (Companies Act): at least 2 of turnover >£10.2M/£15M, balance sheet >£5.1M/£7.5M, employees >50. Inside IR35: taxed via PAYE.
In-Depth Legal Framework & Analysis
The UK off-payroll working rules (ITEPA 2003 Part 2 Chapter 10) apply where an individual provides services to a client through an intermediary (typically a personal service company) and, but for the intermediary, would be an employee for tax purposes. For public-sector clients and medium/large private-sector clients, the client must assess employment status with reasonable care and communicate a Status Determination Statement (SDS). Where inside IR35, the fee-payer must operate PAYE. Where the end-client is a small private business, the original Chapter 8 rules apply, placing determination and tax responsibility on the contractor's PSC.
Inside IR35: Monthly Real Time Information (RTI) PAYE reporting by fee-payer. Outside IR35: Standard annual PSC accounts, CT600, and Self Assessment.
Who Makes the IR35 Determination?
Determine status and communicate a Status Determination Statement.
Determine status, take reasonable care and issue the Status Determination Statement to the worker and relevant party in the contractual chain.
Determine whether the off-payroll rules apply and account for the resulting tax where required.
Inside IR35 vs Outside IR35 Comparison
🔴 Inside IR35
If the worker would have been an employee for tax purposes had they been engaged directly by the client, the off-payroll rules apply.
The worker is taxed broadly as an employee for Income Tax and National Insurance purposes, but this does not automatically make the worker an employee for employment-law rights.
🟢 Outside IR35
Where the worker would have been genuinely self-employed if engaged directly, the off-payroll rules do not apply.
Being outside IR35 does not mean tax-free income. Normal Corporation Tax, Income Tax and dividend rules still apply.
IR35 Compliance Risks
Frequently Asked Questions: UK IR35 Off-Payroll Working Rules for Contractors 2026
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Primary Statutory Authority
Frequently Asked Questions
For public-sector engagements and engagements with medium or large private-sector clients, the client generally determines status and issues a Status Determination Statement. Where the client is a small private-sector business, the worker's intermediary, normally the PSC, generally makes the determination.
An SDS is the client's written determination stating whether the off-payroll rules apply and explaining the reasons for the conclusion. Where the client is responsible for the determination, it must take reasonable care and communicate the SDS through the relevant contractual chain and to the worker.
A contractor is outside IR35 where the facts indicate that they would genuinely be self-employed rather than an employee if engaged directly. Important factors include genuine personal-service or substitution arrangements, the degree of client control, mutuality of obligation, financial risk, opportunity for profit and how the engagement operates in practice.
The fee-payer generally treats the relevant payment as a deemed employment payment, deducting Income Tax and employee National Insurance through PAYE and accounting for employer National Insurance. The worker is therefore taxed broadly like an employee for tax purposes.
No. Contract wording is relevant but does not determine the result by itself. HMRC and courts consider the whole contractual relationship together with the actual working practices. A written substitution clause, for example, has limited value if genuine substitution is not realistically available.
No. They serve different purposes. An SDS deals with the client's IR35 employment-status determination. A Key Information Document is an employment-agency document explaining expected pay, deductions and related information for agency workers.
Common Taxpayer Misconceptions
✓ Rule: The IR35 document is the Status Determination Statement (SDS). A Key Information Document is an agency-worker transparency document under employment agency legislation.
✓ Rule: Medium or large private-sector clients determine status, but for small private-sector clients, the contractor's own PSC determines whether Chapter 8 applies.
✓ Rule: HMRC can pursue unpaid PAYE, NIC, and statutory interest, but penalty levels depend on taxpayer behaviour (careless vs deliberate) and disclosure.