Self employed with only one client: is that employment

Q: Which factors carry more weight than the number of clients?

Control: whether the client has the right to decide what, how, when and where the work is done. Personal service: whether the worker must do the work personally or has a genuine right of substitution. Financial risk: whether the worker can lose money on the job, for example by quoting a genuine fixed price or fixing defects at their own cost. See financial risk as a sign of self employment. Equipment and business set up: whether the worker provides significant equipment fundamental to the work, hires helpers or keeps intellectual property. Intention: ESM0554 says the parties' intention can decide a case only where the relationship is genuinely ambiguous and the other factors are neutral. Hall v Lorimer, summarised at ESM7160, describes the exercise as painting a picture from the accumulation of detail and then standing back to make a qualitative judgement. A single client is one brushstroke in that picture.

Q: How does this look for two freelancers?

Illustration only. Hana set up as a bookkeeper six months ago. Her only client so far is a builders' merchant, for whom she works two days a week on a fixed monthly fee for a defined scope, using her own software licences, with no restriction on other work. She advertises and has sent proposals to other firms. Despite having one client, her picture is that of a business. Leo left a permanent job and now does the same role for the same employer through his company, five days a week, under the company's line manager, with no other clients and a clause requiring permission for outside work. His single client is not the problem in itself, but together with control, integration and dependence it points clearly towards employment.

Working for only one client does not by itself make someone an employee. HMRC’s own guidance at ESM0553 accepts that a person starting in business may work for a single engager because they cannot yet find work elsewhere. What decides status is the contract and how it works in practice: control, personal service, mutuality of obligation, financial risk and whether there is a real business. A long, full time, exclusive relationship with one client is where a single client starts to point strongly towards employment.

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Does having one client make you an employee?

No. Employment status for tax is decided engagement by engagement. The Court of Appeal in Atholl House, as summarised in HMRC’s Employment Status Manual at ESM0560, treats mutuality of obligation and a right of control as preconditions of employment, followed by an evaluation of all the terms of the contract. The number of clients sits outside those terms. HMRC calls it a personal factor (ESM0549): relevant, but weighed with everything else.

GOV.UK guidance also confirms that someone can be employed and self employed at the same time, so a person’s status is not fixed by their overall pattern of work. One engagement can be employment while another, for a different client, is self employment.

What does HMRC say about working for one engager?

ESM0553 makes two points. First, a person with several short self employed contracts who starts to work virtually full time for one engager may find the separate contracts replaced by a contract of employment, because a relationship and commitment builds up between both sides that amounts to an overarching contract. Second, someone starting in business may work for the same engager under a series of contracts simply because they cannot obtain contracts elsewhere. In that case, ESM0553 says, the fact that only one engager is involved would not necessarily mean the engagements are employment, and HMRC should look at other business factors such as financial risk and a business establishment.

The guidance on the Check Employment Status for Tax tool at ESM11140 adds that a worker who works for a single client for a long period is unlikely to be running a business, and that self employed workers are generally less likely to be financially dependent on one hirer. It also warns against drawing conclusions from the pattern of engagements alone. CEST asks whether the work will take up the majority of the worker’s available working time (ESM11160), recognising that available time may be less than a full week.

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Which factors carry more weight than the number of clients?

Control: whether the client has the right to decide what, how, when and where the work is done.
Personal service: whether the worker must do the work personally or has a genuine right of substitution.
Financial risk: whether the worker can lose money on the job, for example by quoting a genuine fixed price or fixing defects at their own cost. See financial risk as a sign of self employment.
Equipment and business set up: whether the worker provides significant equipment fundamental to the work, hires helpers or keeps intellectual property.
Intention: ESM0554 says the parties’ intention can decide a case only where the relationship is genuinely ambiguous and the other factors are neutral.

Hall v Lorimer, summarised at ESM7160, describes the exercise as painting a picture from the accumulation of detail and then standing back to make a qualitative judgement. A single client is one brushstroke in that picture.

When does a single client point towards employment?

The Kickabout Productions case, summarised at ESM7330, shows how dependence on one engager weighs in practice. The radio presenter earned about 90% of his total income from Talksport through his company and did no radio presenting for anyone else in the years in question. His obligation to provide his workdays whenever called on left him unable to take other conflicting work and entirely dependent on Talksport’s discretion to make a living. The Upper Tribunal and Court of Appeal found a contract of employment.

HMRC’s guidance identifies the features that turn one client into a warning sign:

a long engagement or a long run of renewals, which ESM0548 and ESM4136F link to more control, integration and financial dependence
an overarching agreement, such as an obligation to re engage or a restraint of trade clause (ESM4136F)
a clause stopping similar work for others, or requiring the client’s permission, which ESM11145 treats as suggesting the worker is not running an independent business

ESM0555 adds a balance: exclusivity points towards employment but also appears in genuine contracts for services, such as an insurance agent tied to one insurer or an author tied to one publisher.

When can one client still be self employment?

A single client is consistent with self employment where the other factors point that way. Typical examples are a new business winning its first contract while actively marketing for more, a fixed price project where the worker carries real risk of loss, an engagement where the worker supplies major equipment fundamental to the job, and work where the worker keeps ownership of what they create. The question is whether the worker is in business on their own account during that engagement, not how many invoices they raised.

Does it matter if you work through a limited company?

The test is the same, but it is applied to a hypothetical direct contract between the worker and the client under the off payroll working rules. GOV.UK guidance explains that a medium or large client, or any public sector client, is responsible for deciding the worker’s status, while for a small client outside the public sector the worker’s own company decides. The rules apply contract by contract, so one client and one contract means one decision that covers all of the company’s income.

How does this look for two freelancers?

Illustration only. Hana set up as a bookkeeper six months ago. Her only client so far is a builders’ merchant, for whom she works two days a week on a fixed monthly fee for a defined scope, using her own software licences, with no restriction on other work. She advertises and has sent proposals to other firms. Despite having one client, her picture is that of a business.

Leo left a permanent job and now does the same role for the same employer through his company, five days a week, under the company’s line manager, with no other clients and a clause requiring permission for outside work. His single client is not the problem in itself, but together with control, integration and dependence it points clearly towards employment.

What mistakes do people make?

Assuming one client automatically means employment, or that several clients automatically means self employment.
Relying on intention or a contract label when the working reality clearly points one way.
Ignoring exclusivity, permission and notice terms that create dependence.
Forgetting that employment rights status is decided separately; GOV.UK notes that a tribunal can find someone a worker or employee for employment rights even where HMRC accepts self employment for tax. See our guide to employment rights by status.

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Reviewed by Christine Anderson, Broker, Solar Protect. Last reviewed 24 October 2026. Part of Accountapedia, the Solar Protect guide to UK tax and accounting. This page is general information, not personalised advice.