“Is my sole trader business at risk because of IR35?” It’s one of the most common questions sole traders ask — and the answer is more nuanced than a simple yes or no.
The short version: IR35 itself does not apply to sole traders. But that doesn’t mean you’re off the hook. Employment status still matters, and if HMRC decides you’re a disguised employee, the consequences fall on your client — not you. Here’s the plain-English breakdown for 2025/26.
What Is IR35?
IR35 — properly called the Intermediaries legislation (Chapter 8 of ITEPA 2003) — is a tax rule designed to stop “disguised employment”: someone who works like an employee but pays less tax by operating through their own limited company (a personal service company). It only applies where an intermediary sits between the worker and the client. Sole traders have no intermediary, so IR35 does not technically apply to them — but ordinary employment status rules do, and if HMRC decides a sole trader engagement is really employment, the client must operate PAYE.
Does IR35 Apply to Sole Traders?
IR35 — properly called the Intermediaries legislation (Chapter 8 of ITEPA 2003) — is designed to tackle “disguised employment”: someone who works like an employee but pays less tax by operating through their own limited company, often called a personal service company (PSC).
The legislation only applies where an intermediary sits between the worker and the client. That intermediary is typically a limited company or partnership. Because a sole trader operates as an individual — your business is not a separate legal entity — there is no intermediary, and therefore no IR35 assessment in the technical sense.
As IR35 Update puts it: “A sole trader doesn’t work through an intermediary… The formal IR35 rules only apply when an intermediary sits between the worker and the client, which is why almost every enquiry and tribunal case involves a personal service company.”
The Catch: Employment Status Still Applies
IR35 doesn’t apply, but employment status does. This is the part many sole traders miss.
HMRC uses the same case-law tests to decide whether someone is genuinely self-employed or a disguised employee, regardless of whether they trade through a company or as a sole trader. If HMRC determines that a sole trader is actually operating as an employee, the end client (or the agency in the chain — see below) faces significant tax and National Insurance liabilities.
The financial risk lies with the client, not the sole trader. However, being misclassified can disrupt your work and income — the client may stop engaging you, and other clients may become more cautious. For an idea of what else can trigger HMRC’s attention, see our guide on what triggers an HMRC investigation.
The agency legislation: the actual mechanism that catches sole traders
When a sole trader is engaged through a recruitment agency, the relevant law isn’t IR35 — it’s the agency legislation (ITEPA 2003, ss. 44-47). This applies when a worker provides services through an intermediary in the chain (the agency) and is deemed to be an employee for tax purposes.
If HMRC decides the sole trader is really an employee, the fee-payer in the chain — often the agency — must operate PAYE and pay the unpaid tax and NICs. In some structures the end client can also be liable. The agency is responsible for assessing employment status when it’s the one engaging the worker directly.
How HMRC Decides Employment Status
HMRC applies several tests, drawn from decades of case law, to determine whether someone is employed or self-employed for tax purposes. The key factors include:
- Control — how much say does the client have over how, when, and where the work is done?
- Substitution — do you have the right to send a suitable substitute to do the work, and could you actually do so?
- Mutuality of obligation (MOO) — is the client obliged to offer you work, and are you obliged to accept it?
- Financial risk — do you bear risk (e.g., covering your own expenses, fixing mistakes at your own cost)?
- Equipment — do you provide your own tools and equipment?
- Integration — how embedded are you in the client’s business? Do you appear to outsiders as one of their staff?
- Basis of payment — are you paid a regular salary, or project-based fees with invoices?
No single factor is decisive. HMRC looks at the overall picture of the working relationship.
Sole Trader Red Flags
Certain arrangements raise the risk of being treated as a disguised employee:
- Working exclusively for one client
- Having little control over how, when, or where you work
- Being integrated into the client’s team (e.g., on their org chart, using their email address)
- Using the client’s equipment
- Being paid a regular salary rather than invoicing for project-based fees
- No right of substitution in your contract or in practice
- Mutuality of obligation — the client must offer work and you must accept it
How to Check Your Status: Use CEST
HMRC’s free Check Employment Status for Tax (CEST) tool is available to anyone — workers, hirers, and agencies. According to HMRC’s guidance: “CEST can be used by anyone who needs to understand employment status for tax and NICs purposes.”
CEST covers both IR35/off-payroll engagements (limited company contractors) and direct engagements (sole traders). It asks about the contract, the worker’s responsibilities, who decides what work is done and how, how the worker is paid, and whether expenses or benefits are provided. It then gives HMRC’s view of the status for that engagement.
A few caveats from LITRG: CEST is only as accurate as the information you enter, the language can be hard to map onto certain types of work, and it doesn’t address every sector-specific nuance. Treat it as one tool among several — not the final word. For complex cases, get advice from an IR35 specialist or a body like IPSE.
Protecting Yourself as a Sole Trader
To minimise the risk of misclassification:
- Put it in writing. Ensure your contracts clearly state you’re a sole trader providing self-employed services, and outline the nature of the relationship (no mutuality of obligation, right of substitution, etc.).
- Make practice match the contract. If your contract says you can send a substitute, make sure you genuinely could. HMRC looks at what actually happens, not just what’s on paper.
- Diversify your client base. Working for multiple clients strengthens your case for genuine self-employment — it shows you’re running a business, not dependent on a single employer. See our guide on MTD for freelancers with multiple trades for how multiple income streams interact with your tax reporting.
- Bear your own costs and risk. Provide your own equipment where possible, cover your own expenses, and invoice for work done rather than taking a salary.
- Avoid integration. Don’t use the client’s email address, don’t appear on their org chart, and don’t attend their staff meetings as if you were an employee.
- Check your status. Run each engagement through CEST, and if the result is unclear or borderline, get professional advice before the engagement starts.
What’s Changed in 2026 (and What Hasn’t)
April 2026: higher small-company thresholds
From 6 April 2026, two of the three thresholds that determine whether an end client is “small” — and therefore exempt from the 2021 off-payroll reforms — increased:
| Threshold | Before 6 April 2026 | From 6 April 2026 |
|---|---|---|
| Turnover | £10.2 million | £15 million |
| Balance sheet total | £5.1 million | £7.5 million |
| Employees | 50 | 50 (unchanged) |
According to Greenberg Traurig’s analysis: “Some companies currently within scope of IR35 will fall outside the regime at the start of the 2026-2027 tax year.”
This primarily affects limited-company contractors, but it’s relevant context for sole traders too: more clients now qualify as small, which changes how much status scrutiny is happening in the market. A small client isn’t exempt from the ordinary employment status rules that catch sole traders — but they’re less likely to have formal status determination processes in place.
Labour’s position: no IR35 review
Since Labour took office in July 2024, IR35 has remained untouched. A Treasury minister ruled out an IR35 review on 30 June 2026, and the long-promised employment status consultation — initially expected in 2025 — has been delayed to early 2026. According to ContractorUK, early indications suggest tax status may be excluded from the consultation’s scope entirely.
The FCSA’s position is blunt: “The government has ruled out a review of the OPW legislation… So the rules that apply now are the rules for the foreseeable future. There is no pending change to wait for.”
For sole traders, this means the current employment status framework — and the agency legislation — is what you’re working with. Don’t hold out for reform. If you’re also navigating Making Tax Digital for Income Tax, the status of your engagements doesn’t change your MTD reporting obligations — you still send quarterly updates regardless of whether a client classifies you as employed or self-employed.
The Bottom Line
- IR35 does not apply to sole traders. The Intermediaries legislation only applies where an intermediary (typically a limited company) sits between you and the client. You have no intermediary.
- Employment status still matters. HMRC uses the same case-law tests to decide if you’re genuinely self-employed or a disguised employee.
- The client (or agency) pays if you’re misclassified — not you. But misclassification can disrupt your work and income.
- The agency legislation is the actual mechanism that catches sole traders engaged through recruitment agencies, not IR35.
- CEST is available to sole traders. Use HMRC’s free tool to check your status for each engagement.
- Make your contracts and working practices align. Substitution rights, control, financial risk, and integration all matter — and practice must match paper.
- The April 2026 threshold changes affect the market, not the rules that apply to you directly — but they change which clients are scrutinising status.
- No IR35 reform is coming. Labour has ruled out a review. The current rules are the rules for the foreseeable future.
For the full comparison of self-employed business structures — sole trader, limited company, umbrella, and CIS — see our self-employed business structure hub.
For more plain-English explanations of HMRC terms, see our full jargon buster. For the broader framework of how HMRC decides whether you’re employed or self-employed — and what that means for your NI, expenses, and tax return — see our employment status and tax hub. For the full comparison of sole trader vs limited company — including whether IR35 risk should factor into your structure decision — see our sole trader or limited company hub. If you’re registering as self-employed for the first time, see our first-year self-employed checklist. For how to handle your trading allowance vs actual expenses as a sole trader, and how the Construction Industry Scheme works if you’re in construction, see those guides.