| By Chandraketu Tripathi | Updated April 2026 | |||||||||||||||
| IR35 affects hundreds of thousands of UK contractors. Getting your IR35 status wrong — or accepting an incorrect 'inside IR35' determination from a client — can cost you £10,000-20,000 per year in additional tax. Understanding the rules, your rights, and how to protect yourself is essential for anyone operating through a Personal Service Company (PSC) in 2026. | |||||||||||||||
Key Facts IR35 applies to: contractors working through limited companies | Private sector determination: end client (if medium/large) | Public sector: always the client | Key tests: substitution, control, mutuality of obligation | HMRC tool: CEST | |||||||||||||||
Inside vs Outside IR35: The Financial Difference | |||||||||||||||
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The Three IR35 Tests | |||||||||||||||
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Who Decides Your IR35 Status? | |||||||||||||||
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How to Protect Yourself Outside IR35 | |||||||||||||||
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Frequently Asked QuestionsWhat is IR35 UK? IR35 is a set of tax rules that determines whether a contractor working through a limited company should be taxed as an employee. If HMRC decides you are 'inside IR35' — meaning you work like an employee for your client — you must pay income tax and National Insurance as if you were employed. If you are 'outside IR35', you operate as a genuine business and can extract income tax-efficiently through salary and dividends. How do I know if I am inside or outside IR35? IR35 status depends on three main tests: Substitution (can you send a substitute to do your work?), Control (does your client control how, when, and where you work?), and Mutuality of Obligation (is your client obliged to offer work and are you obliged to accept?). If you can substitute, have low control, and have no MOO — you are likely outside IR35. HMRC's CEST tool can help determine your status, though it is not legally binding. Who is responsible for IR35 determination UK 2026? For private sector contracts, the end client (the company you work for) is responsible for determining your IR35 status if they have more than 50 employees, more than £10.2m turnover, or more than £5.1m on their balance sheet. Small companies (below these thresholds) — the responsibility falls on you as the contractor. Public sector clients are always responsible for the determination. What is the difference between inside and outside IR35 take-home pay? Being inside IR35 significantly reduces take-home pay. Example: contract rate £500/day, 220 days = £110,000. Outside IR35 (salary + dividends): take-home approximately £75,000-80,000. Inside IR35 (taxed as employee): take-home approximately £60,000-65,000. The difference of £10,000-15,000/year represents the loss of dividend tax efficiency and ability to retain profits in the company. What happens if HMRC says I am inside IR35? If HMRC determines you are inside IR35, you (or your client from April 2021) must pay the 'deemed employment payment' — income tax and NIC at employment rates on your contract income, minus 5% for expenses. HMRC can investigate back 6 years. Penalties for non-compliance can reach 100% of unpaid tax. If in doubt, take professional advice from an IR35 specialist before accepting a contract. | |||||||||||||||
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| Disclaimer: Always verify with GOV.UK, Ofgem, Acas, and HMRC. Sources: ofgem.gov.uk, uswitch.com, moneysupermarket.com, acas.org.uk, ciphr.com, payfit.com, employeehandbooktemplateuk.co.uk. April 2026. |
IR35 Rules UK 2026: What Contractors Need to Know
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