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Self-Employed Contract UK: Key Terms & When to Use

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Part ofUK Employment Law Guide for Employers (2025)

Written by Brad Askew Solicitor (non-practising)
Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice.
Updated June 2026 · England & Wales
If you work for yourself, or you hire people who do, the paperwork that sits behind the working relationship matters far more than most people realise. A self-employed contract sets out what the contractor has agreed to do, what the client has agreed to pay, and how the two sides will behave while the work is under way. Without one, disputes tend to turn into arguments about memory rather than arguments about facts. This guide walks through what a self-employed contract actually is, why it is sensible to have one in writing, how employment status is judged in the UK, and the practical points worth thinking about before you sign or send one out. It is written for contractors, freelancers, consultants, and the businesses that engage them.

What this document is

A self-employed contract is a written agreement between a client and an independent worker who is running their own business rather than being employed. It records the services to be provided, the fee, timescales, and the rights and responsibilities of each side.

Because a self-employed person is not on the payroll, the contract fills the role that an employment contract would otherwise play: it gives both parties something concrete to point at if the working relationship becomes strained. A well-drafted contract typically deals with how the work will be carried out, who owns any intellectual property created, confidentiality, invoicing and payment terms, and how either side can bring the arrangement to an end.

It is worth remembering that the label you put on the document does not, by itself, determine employment status. HMRC and the tribunals look at how the relationship works in practice. A contract that calls someone self-employed but treats them as an employee will not protect either side from the consequences.

How to use this document

  1. Identify the parties and the scope. Start by naming the client and the contractor clearly, including any trading name or limited company. Then describe the services in enough detail that a stranger reading the contract would understand what is being delivered. Vague scope is the single biggest cause of fallings-out on self-employed work.
  2. Agree fees, expenses and payment terms. Set out the fee structure, whether that is a fixed price, a day rate, or something project-based. Include when invoices can be raised, how quickly they must be paid, what happens if payment is late, and how expenses will be handled. Write it plainly so there is no room for creative interpretation later.
  3. Address tax, status and substitution. Make clear that the contractor is responsible for their own income tax and National Insurance, and that they are not an employee or worker of the client. Consider including a right of substitution, which allows the contractor to send someone else to do the work, as this is one of the factors that points towards genuine self-employment.
  4. Deal with ownership, confidentiality and liability. Spell out who owns the work product once it is delivered and paid for, and how each side will treat confidential information shared during the engagement. It is also sensible to include a reasonable cap on liability and to mention insurance, particularly where the contractor is providing professional services.
  5. Set out how the contract ends. Agree notice periods for ending the arrangement, what happens to work in progress if one side pulls out, and how any final invoices will be settled. A calm, written exit plan prevents a heated, undocumented one. Finally, both parties should sign and keep a dated copy.

Common questions

Q Is a written self-employed contract legally required?
No, a verbal agreement can be legally binding in England and Wales, and plenty of freelance work is done on nothing more than emails and an invoice. The difficulty is proof. If the fee, deadlines, or scope become disputed later, a written contract gives both sides a clear record. For anything beyond a small, one-off job, putting the terms in writing is strongly advisable.
Q What is the difference between a self-employed contractor and an employee?
An employee usually works set hours, uses the employer's tools, is told how to do the job, and has tax and National Insurance deducted at source. A self-employed contractor decides how the work gets done, can usually turn work down, often works for several clients, and handles their own tax affairs. The courts look at the reality of the arrangement rather than what the paperwork calls it.
Q Can someone be self-employed for one client and employed by another?
Yes. Employment status is judged on each engagement separately, so it is perfectly possible to have a day job as an employee and pick up freelance work on the side as a self-employed person. Each relationship needs to stand on its own facts. You should check the tax treatment of each role with HMRC's guidance or an accountant, as getting this wrong can be costly.
Q Does calling someone self-employed in the contract make them self-employed?
No, and this is one of the most common mistakes. If HMRC or a tribunal concludes that the working relationship has the hallmarks of employment, the label in the contract will be set aside. They will look at control, substitution, mutuality of obligation, how integrated the person is in the business, and who takes the financial risk. The paperwork needs to match the reality.
Q What is IR35 and does it affect self-employed contracts?
IR35 is the shorthand for HMRC's off-payroll working rules. It mainly affects contractors who provide services through their own limited company. The rules look at whether, setting the company aside, the individual would really be an employee of the end client. If so, tax is broadly meant to be paid as if they were employed. Anyone contracting through a company should check where responsibility for assessing status sits.
Q Who owns the work a self-employed contractor produces?
By default, the contractor typically owns the intellectual property in what they create, and the client gets a licence to use it. That is often not what clients assume. If the client wants to own the work outright, the contract needs to say so, usually through an assignment of intellectual property rights that takes effect on payment. This is an area where getting the wording right matters.
Q Can a self-employed contract be ended early?
Yes, if the contract allows it. Most self-employed agreements include a notice period, commonly somewhere between a week and a month, during which either side can bring the arrangement to an end. The contract should also cover what happens to unpaid invoices, work in progress, and returned materials. Without a termination clause, ending the contract cleanly becomes much harder.

Sources

This guide is based on primary UK law and official guidance.

Brad Askew, Solicitor (non-practising)

Written & reviewed by

Brad Askew Solicitor (non-practising)

Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice. LegalDocuments.co.uk is not a law firm and does not provide regulated legal advice.

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Legal disclaimer
This article is for general information only. It is a tool to help you find your way — not legal advice, and not a substitute for speaking to a qualified adviser about your situation.