by Asim Abbas
11 November 2026 
IR35 for contractors in 2026: inside or outside?
IR35 for contractors in 2026: inside or outside?
IR35 decides whether a contractor working through their own limited company should be taxed like an employee. Getting it wrong can be expensive for both contractor and client.
- Medium and large clients decide your status
- With small clients, your company decides
- Inside IR35 means PAYE and NI on fees
- Key tests: control, substitution, mutuality
For most medium and large clients, it’s the client who decides your status, while small clients leave it to you.
This guide explains how the rules work in 2026, the key status tests and what an inside IR35 role means for your take-home pay.
What is IR35?
IR35, also called the off-payroll working rules, applies when you provide services through an intermediary, usually your own personal service company, but would be an employee if engaged directly. If you’re inside IR35, fees are taxed broadly like employment income.
Who decides your status?
| Client | Who decides | Who deducts tax |
|---|---|---|
| Public sector body | Client | Fee payer |
| Medium or large private client | Client | Fee payer |
| Small private client | Your company | Your company |
A client is small if it meets two of the Companies Act small company tests. These were raised in April 2025 to turnover of £15 million, a balance sheet of £7.5 million and 50 employees. Medium and large clients must issue a Status Determination Statement explaining their decision.
Salary after tax calculator
Compare an inside IR35 rate.
The key status tests
- Control: does the client decide how, when and where you work?
- Substitution: could you genuinely send someone else to do the work?
- Mutuality of obligation: must the client offer work and must you accept it?
- Financial risk: do you bear the cost of fixing mistakes or invest in equipment?
- Part and parcel: are you integrated like a member of staff?
HMRC’s CEST tool gives a view, but tribunals look at the whole picture, including what happens in practice, not just the contract.
A software contractor bills £500 a day for 220 days, £110,000. Outside IR35, with a small salary and dividends, she might keep around £70,000. Inside IR35, the fee payer deducts PAYE, employee NI and, usually, employer NI and the Apprenticeship Levy before paying her, so take-home could be closer to £66,000, depending on how the rate is set.
Fixed-fee accountancy support
Transparent monthly packages for sole traders, landlords and limited companies. Fixed fees agreed upfront, VAT included.
Get a fixed-fee quoteCall 0161 531 4179If a role is inside IR35
- Ask whether the day rate reflects employer costs being deducted
- Your company receives payments net of tax and NI
- The deemed payment isn’t taxed again when paid out as salary
- Pension contributions can still reduce tax
- Consider whether an umbrella company is simpler for that contract
Challenging a decision
You can dispute a Status Determination Statement with the client, who must respond within 45 days. Provide evidence of substitution, control and how you actually work. Since April 2024, where HMRC finds a deemed employment was missed, tax already paid by the worker can be offset against the fee payer’s liability.
Working for small clients
With small clients, your company decides and, if inside, works out a deemed employment payment at the end of the tax year. Keep a file on each contract.
Read HMRC’s off-payroll guidance, our salary vs dividends guide and our contractor accountancy service.
What should I do next?
Small or not?
Ask for one if missing.
Not just the contract.
Frequently Asked Questions
Who decides IR35 status in 2026?
Medium and large private clients and public bodies decide. Small clients leave it to the contractor’s company.
What is a Status Determination Statement?
The client’s written decision on your IR35 status, with reasons.
Does inside IR35 mean I’m an employee?
No. It means you’re taxed like one for that engagement, but you don’t get employment rights.
Can I use an umbrella company instead?
Yes. Many contractors use an umbrella for inside IR35 roles.
How do I challenge an IR35 decision?
Raise a dispute with the client, who must respond within 45 days.
Need help with this? Wingate Accountants offers fixed-fee online accountancy support across the UK. Call 0161 531 4179 or request a quote at wingateaccountants.co.uk.
About the Author
Asim Abbas
I’m Asim Abbas, founder of Wingate Accountants and a Chartered Certified Accountant. I help sole traders, landlords and directors stay on top of their tax with fixed fees and plain-English advice.
