IR35 is shorthand for the Intermediaries Legislation, introduced in April 2000. Its primary purpose is to tackle 'disguised employment', where individuals supply services through an intermediary (usually a limited company or personal service company, PSC) but would otherwise be classed as employees if that intermediary didn’t exist.
The legislation aims to ensure that such workers pay broadly the same Income Tax and National Insurance contributions (NICs) as employees.
When a contractor is said to be "outside IR35", it means that, in the eyes of HMRC, they are genuinely self-employed and not working as a disguised employee. In practical terms, this status confirms that the contractor is running their own business, taking on projects or assignments for clients under a business-to-business arrangement, rather than working in a role similar to that of a permanent employee.
Being outside IR35 allows the contractor to operate through their own limited company or personal service company (PSC) and manage their finances more tax-efficiently. This typically means they can pay themselves a combination of salary and dividends, which often results in a lower overall tax bill compared to being taxed as an employee under PAYE.
However, being outside IR35 isn’t just about how you get paid. It also reflects the nature of the working relationship between the contractor and the client. Contractors who are outside IR35 usually have more independence. They are free to decide how and when they complete the work, can often send a substitute to carry out the services if necessary, and are not subject to the same level of control or supervision as regular employees. Additionally, they take on the risks and responsibilities that come with running a business, such as providing their own equipment, managing multiple clients, and carrying professional indemnity insurance.
Importantly, this status is not determined by what the contract says alone, but also by how the working relationship operates in reality. If a contractor has control over their work, operates independently, and is not integrated into the client’s organisation like a regular employee, they are more likely to be considered outside IR35.
In summary, being outside IR35 means you are seen as a genuine business providing services—not as someone using a limited company simply to reduce tax while effectively working like an employee. It allows greater financial flexibility and professional freedom, but also comes with responsibilities that make it clear you're operating as your own boss.
One of the key advantages of being outside IR35 is the potential for a higher take-home pay. Since you're not taxed in the same way as an employee, you can draw income more efficiently, typically through a combination of salary and dividends via your limited company. However, the exact amount you retain depends on several factors, including your day rate, expenses, and how you structure your payments.
To help you get a clearer picture, we’ve created an Outside IR35 Take-Home Pay Calculator. It provides a quick and easy estimate of what your income could look like when operating outside IR35, helping you plan with confidence.
Understanding IR35 hinges on whether a contractor is working inside or outside the scope of the legislation:
So, if a contract is Outside IR35, it means HMRC considers the contractor to be self-employed for that engagement.
IR35 status is determined by looking at the actual working relationship between the contractor and the client, rather than relying solely on the written contract. HMRC assesses whether the contractor is truly self-employed or, in effect, working as an employee under a different label. This means that even if a contract says it’s outside IR35, it won’t hold up if the day-to-day working practices suggest otherwise.
To make this judgement, HMRC considers several key factors. These include how much control the client has over the work, for example, whether they dictate how, when, and where it must be done. Another important test is the right of substitution: can the contractor send someone else to complete the work in their place, or is the role personally dependent on them? Mutuality of obligation is also crucial, which refers to whether there is an ongoing expectation of work being offered by the client and accepted by the contractor.
Other signs of genuine self-employment include taking on financial risk, such as covering project overruns or fixing mistakes at your own expense, and using your own tools or equipment to complete the job. All these factors combined give a clearer picture of whether a contractor is operating as a business in their own right, or working in a way that resembles regular employment.
In order to stay outside IR35, contractors can follow these steps:
| Myth | Facts |
|---|---|
| Being outside IR35 just means having a limited company. | IR35 status is determined by your actual working practices, not just the way your business is set up. |
| You’re safe if your contract says you’re outside IR35. | HMRC looks at how you actually work with the client, regardless of what the contract says. |
| Short contracts are always outside IR35. | Even short-term engagements can fall inside IR35 if they resemble an employment relationship. |
Being Outside IR35 can offer significant financial and professional benefits, but it’s not something to be assumed or taken lightly. Contractors must ensure that both the contract terms and working practices reflect a true business-to-business relationship.
For clients, proper IR35 assessments are not only a legal obligation but vital to building trust with skilled contractors. When in doubt, seek legal or tax advice from professionals who specialise in contractor compliance.
This article is intended for general informational purposes only and does not constitute legal or tax advice. You should consult a qualified adviser for guidance tailored to your specific circumstances.