Contractor, worker or employee? Understanding employment status

Employment law draws a distinction between self-employed contractors, workers, and employees, and the category an individual falls into determines their rights, their tax treatment, and the obligations owed to them by the business engaging their services. A signed contract describing someone as self-employed does not settle the question on its own. Tribunals and HMRC assess how the working relationship operates in practice, and the label the parties give it carries limited weight where the day-to-day reality points to a different category [2].

Around 4.39 million people in the UK were self-employed in late 2025, representing roughly 13% of the workforce [3]. Contractor arrangements are used across most sectors of the economy. The Employment Rights Act 2025, which received Royal Assent on 18 December 2025, introduced the Fair Work Agency as a single enforcement body with powers to conduct unannounced inspections and request documents. Where National Minimum Wage has been underpaid, the agency can recover arrears and impose penalties of up to 200% of the amount owed [1].

Summary

• The law recognises three categories of working person: employees, workers, and self-employed contractors. Each carries different rights, obligations, and tax treatment [4].
• The written contract is only one factor in determining employment status. Tribunals assess the reality of the working relationship, and the label the parties choose carries limited weight [2].
• Three tests are consistently identified in case law as central to status decisions: personal service, mutuality of obligation, and control. Integration and financial risk sit alongside them [9].
• Off-payroll working rules (IR35) apply where a contractor works through their own limited company. Medium and large businesses must issue a Status Determination Statement; small businesses are exempt [13][16].
• The Employment Rights Act 2025 introduced the Fair Work Agency, launched on 7 April 2026, with powers including unannounced inspections and penalties of up to 200% of unpaid National Minimum Wage arrears [1][21].
• Financial exposure from misclassification includes back-dated PAYE and National Insurance (normally up to four years, extending to six for careless errors and twenty for deliberate non-compliance), plus holiday pay, pension contributions, and statutory payments owed to the individual [14][16].
• Employment status is not fixed at the start of an engagement. Where the working relationship changes over time, the applicable category may change with it [16].

The three categories of working person

UK employment law recognises three distinct categories, each with different rights and obligations [4].

Employees work under a contract of employment with ongoing mutual obligations. They cannot generally send substitutes, work under the employer's direction, and receive the full range of statutory rights - protection from unfair dismissal (after the qualifying period), statutory sick pay, family leave, redundancy pay, and the right to a written statement of employment particulars.

Workers occupy an intermediate position. They must personally perform the work and receive core protections including the National Minimum Wage, paid holiday, rest breaks, and protection from unlawful deductions [5]. However, they do not receive the full suite of employment rights that employees do.

Self-employed contractors run their own businesses. They bear financial risk, control how they work, can typically send substitutes, and invoice clients for services [6]. Contractors have no statutory employment rights and manage their own tax and National Insurance through Self Assessment.

Case law such as Autoclenz Ltd v Belcher (2011) UKSC 41 established that tribunals will look at the reality of the working relationship, not just what the written contract states [7]. This principle was reinforced in Uber BV v Aslam (2021) UKSC 5, where the Supreme Court held that Uber drivers were workers despite contractual documentation describing them as self-employed [8]. The judgment made clear that tribunals should determine status by reference to the statutory definition, not the contractual label.

The key status tests

There is no single test for employment status. Tribunals weigh several factors together and consider the relationship as a whole [9]. Three are consistently identified in case law as central: personal service, mutuality of obligation, and control.

Personal service and substitution

If the individual must perform the work personally, this points towards employee or worker status. A genuine, unfettered right to send a substitute - as in the Deliveroo model, where riders can pass any accepted job to a third party without restriction - points towards self-employment [10].

Tribunals examine whether the right operates in practice, not only whether it appears in the contract. In Pimlico Plumbers Ltd v Smith (2018) UKSC 29, the Supreme Court held that plumbers were workers because their right to substitute was severely limited: they could only swap with another Pimlico plumber, and only in limited circumstances [11]. Substitution clauses that appear in the contract but are not exercised in practice have been treated by tribunals as inconsistent with genuine self-employment.

Mutuality of obligation

This test examines whether the business is obliged to offer work and the individual obliged to accept it. Ongoing mutual obligations point towards employee status. A genuine ability to turn down offered work without penalty, and a lack of any commitment on the business to provide it, points towards self-employment or worker status.

Control

The more control the business exercises over how, when, and where the work is done, the more the relationship resembles that of an employee or worker. Fixed hours, direct supervision, mandatory attendance at meetings, and prescribed methods of working all point in that direction. A contractor who decides their own hours, methods, and sequence of work - and who can accept or refuse individual assignments - sits closer to self-employment.

Integration and financial risk

Beyond the three primary tests, tribunals consider how integrated the individual is into the business (whether they appear on internal directories, hold a company email address, or attend team meetings as a matter of course) and whether they bear genuine financial risk (providing their own equipment, carrying professional indemnity insurance, or losing money on unprofitable jobs).

In long-running engagements where a contractor has become embedded in delivery teams, integration factors have often been given significant weight by tribunals, and a contractual right of substitution that has not been exercised in practice has been given less [12].

Off-payroll working rules (IR35)

Where a contractor provides services through their own limited company - often called a personal service company (PSC) - the off-payroll working rules apply [13]. Introduced in 2000 and reformed for the private sector in April 2021, IR35 is designed to prevent "disguised employment," where a worker uses a company structure to reduce their tax bill despite operating effectively as an employee [14].

Under the reformed rules, the client organisation (not the contractor) is generally responsible for determining status. Medium and large businesses must issue a Status Determination Statement (SDS) explaining the decision and take reasonable care in reaching it [15]. If the client decides the engagement is "inside IR35," the fee-payer must deduct PAYE income tax and National Insurance before paying the contractor's company.

Small businesses are exempt from the client-side rules. A business qualifies as small by failing at least two of these tests: turnover above £15 million, balance sheet total above £7.5 million, or more than 50 employees [16]. In small-client engagements, the contractor's PSC remains responsible for assessing its own IR35 status.

The financial exposure

Where HMRC determines that an engagement was wrongly classified as outside IR35:

• All income received is reclassified as employment income [17].
• The fee-payer becomes liable for unpaid PAYE income tax, employee and employer National Insurance, interest, and penalties [14].
• HMRC can look back six years - or twenty years in cases of deliberate non-compliance [16].
• From April 2025, the employer National Insurance rate rose from 13.8% to 15%, and the threshold for employer NICs liability on earnings reduced from £9,100 to £5,000 [17].

Offset rules introduced from April 2024 mean that tax already paid by the contractor or their PSC can be credited against the client's liability, reducing the double-taxation risk that existed under the previous regime [18]. However, remaining tax, interest, and penalties still fall on the client.

HMRC's CEST tool: what it does and doesn't do

The Check Employment Status for Tax (CEST) tool is HMRC's free online questionnaire for assessing status [19]. Users answer questions about the working arrangement - control, substitution, financial risk, and so on - and receive one of three outcomes: employed for tax purposes, self-employed for tax purposes, or "unable to determine."

HMRC has committed to standing by CEST determinations, provided the information entered is accurate and consistent with HMRC guidance [19]. The tool was updated on 30 April 2025 to simplify the language of its questions and add a new question on whether a contract is in place [20]. The underlying decision-making logic was not changed.

HMRC data indicates the following.

• Around one in five CEST determinations returns an "unable to determine" outcome, in which case the user must seek further guidance to reach a decision [9].
• Total CEST determinations fell from 458,894 in 2023/24 to 135,178 in 2025/26, a decline of 71% over two years [9].

CEST covers tax status only. It does not determine worker or employee status for the purposes of employment rights, which sit under separate case law and statutory tests. A separate assessment is needed to establish whether an individual has worker rights under the National Minimum Wage Act 1998, the Working Time Regulations 1998, or the Employment Rights Act 1996.

Arrangements that have attracted regulatory and tribunal attention

Certain patterns of engagement have featured repeatedly in HMRC enquiries and employment tribunal decisions [12].

• Long-running contractor engagements where the individual has become embedded in a delivery team, uses company systems, and works alongside employees doing similar work.
• Care sector arrangements using self-employed carers on set rotas taking direction from the provider. Multiple tribunal decisions in the sector have resulted in findings of worker status, and the FWA has identified care as a priority area for enforcement [12].
• Agile delivery teams in technology and consultancy, where contractors and permanent staff work in mixed teams on ongoing product development.
• Freelance roles in production, design, and editorial, particularly where a contractor works with a small number of repeat clients over extended periods.
• Sole-client contractors - individuals who work exclusively or almost exclusively for one business, particularly over multiple years.

Duration alone does not determine employment status, but it is a factor tribunals consider alongside the other tests. A long-running engagement in which the individual uses client-provided equipment, attends internal meetings, and works under management direction combines several indicators associated with employee or worker status.

Total exposure from misclassification

Misclassification exposure typically falls into three categories:

• HMRC recovery: back-dated PAYE income tax and National Insurance for up to six years, plus interest and penalties. In cases of deliberate non-compliance, HMRC's look-back period extends to twenty years [16].
• Employment tribunal claims: back-dated holiday pay, statutory sick pay, pension contributions, and, where the qualifying period is met, unfair dismissal awards. The compensatory award for unfair dismissal is currently capped at the lower of a statutory maximum or 52 weeks’ pay; the cap is removed from 1 January 2027. Certain claims, including discrimination, are already uncapped.
• Fair Work Agency penalties: where an FWA investigation finds National Minimum Wage has been underpaid, penalties of up to 200% of the arrears, in addition to the arrears themselves [1].

Employment tribunal judgments are published on the government tribunal decisions database and are publicly searchable, meaning findings of misclassification enter the public record.

The current position

Genuine contractor arrangements - those in which the individual runs their own business, bears financial risk, and controls how the work is performed - remain a lawful and widely used form of engagement across Great Britain. Status disputes generally arise in cases where the contractual documentation and the day-to-day operation of the relationship diverge, or where an engagement that started as a defined project has evolved into ongoing, integrated work.

Status is a question of fact, decided by a tribunal or by HMRC on the evidence of how the relationship operates. The written contract, the CEST tool result, and the label the parties give the arrangement are each factors in that assessment, but none is determinative on its own.

This article is intended for informational purposes only and does not constitute legal advice. The information is accurate at the time of writing but may be subject to change. For advice specific to your situation, please consult a qualified professional.

[1] Acuity Law, Employment Rights Bill receives Royal Assent, January 2026.

[2] Supreme Court, Autoclenz Ltd v Belcher [2011] UKSC 41.

[3] LegalVision UK, What is the Difference Between Employees and Contractors?, 2026.

[4] GOV.UK, Employment status.

[5] ACAS, Employment status.

[6] GOV.UK, Employment status: self-employed and contractor.

[7] Employment Cases Update, Autoclenz v Belcher & Ors [2011] UKSC 41.

[8] Blake Morgan, Supreme Court rules Uber drivers are workers, 2021.

[9] IR35 Update, CEST explained: when HMRC's IR35 tool works - and when it doesn't, June 2026.

[10] Farore Law, Recent Supreme Court ruling - why are Deliveroo riders not workers?, 2023.

[11] Howat Avraam Solicitors, Pimlico Plumbers - A Cautionary Tale.

[12] Policy Pros, Contractor vs Employee Status 2026 - Avoiding Misclassification Claims, May 2026.

[13] GOV.UK, Off-payroll working (IR35): detailed information, updated May 2025.

[14] Sage, Guide to off payroll working rules and IR35, July 2025.

[15] Crunch, IR35 Changes in 2025 - A full guide to the Latest Off-Payroll Working Rules.

[16] Rebox HR, Employee vs Contractor: UK Employment Status Guide, January 2026.

[17] Daniel Wolfson, Inside vs Outside IR35: Complete UK Contractor Guide (2026), July 2026.

[18] Crunch, IR35 Changes in 2025 - A full guide to the Latest Off-Payroll Working Rules (offset rules).

[19] GOV.UK, Check Employment Status for Tax (CEST), updated 30 April 2025.

[20] Bird & Bird, A Closer Look at HMRC's Updated CEST Tool, 2025.

[21] CIPD, Fair Work Agency: Changes under the Employment Rights Act 2025, February 2026.