Employed or Self-Employed? Understanding Employment Status for UK Tax Purposes
One of the most important questions for any business engaging workers is whether that worker is employed or self-employed. This distinction is not simply a matter of what is written in the contract - it is determined by HMRC practice and case law.
In general:
An employee works under a contract of service
A self-employed person works under a contract for services
Although this distinction may sound technical, getting it wrong can lead to serious consequences for both the engager and the worker, particularly in relation to PAYE, National Insurance Contributions (NIC), pension rights, VAT obligations, and employment law protections.
Who Is Responsible for Determining Employment Status?
The responsibility for determining the correct employment status rests with the business engaging the worker’s services.
Where the status is unclear, the engager can:
Ask HMRC for an opinion from the local status inspector, or
Use HMRC’s Check Employment Status for Tax (CEST) tool available here:
https://www.gov.uk/guidance/check-employment-status-for-tax
Using the correct status is essential because the tax treatment of an employee and a self-employed individual differs significantly.
Why Is Employment Status Important?
If the Worker Is an Employee
If HMRC determines that a worker is an employee:
Their income is treated as employment income
It is subject to Class 1 National Insurance Contributions, which are generally more expensive than self-employed NIC
The worker is paid through PAYE
Expense claims are more restricted
The worker may be entitled to occupational pension contributions
There are no VAT registration obligations
The worker is protected by employment law
This means higher compliance responsibilities and costs for the employer.
If the Worker Is Self-Employed
If the worker is genuinely self-employed:
Income is treated as trading income
It is subject to Class 2 and Class 4 NIC
Income is reported through Self Assessment
Expense rules are more flexible
Pension contributions are personal only — there are no employer pension contributions
VAT registration may be required if the registration threshold is exceeded
The worker has less legal protection
This usually offers greater flexibility but fewer employment rights.
The Four Key Tests for a Contract of Service
For a relationship to be regarded as a contract of service (employment), four main factors must be present:
1. Mutuality of Obligation
There must be an obligation on the employer to provide work, and an obligation on the worker to accept and perform it.
2. Wage Paid to the Worker
The worker must be paid directly by the engager, rather than by a third party.
3. Personal Service
The worker must personally carry out the work. If they are free to send a substitute, this points towards self-employment.
4. Control
The engager must have control over what work is done, how it is done, and when it is done.
These principles were derived from the landmark case Ready Mixed Concrete (South East) Ltd v Minister of Pensions and National Insurance (1968).
Ready Mixed Concrete Case Summary
In this case, the court considered whether lorry drivers were employees or self-employed contractors. Although the drivers owned their own vehicles, the company exercised significant control over their work.
The court established that for employment to exist:
The worker agrees to provide work in return for remuneration
The worker agrees to be subject to the employer’s control
Other contractual terms must be consistent with employment
This case remains one of the leading authorities on employment status.
Other Factors Considered by HMRC and the Courts
No single factor determines status. HMRC and the courts look at the overall relationship, including:
Degree of integration into the business
Provision of own equipment
Basis of payment
Financial risk
Opportunity to profit
Business organisation
Number and length of engagements
Terms of the contract and intentions of the parties
Several important tax cases have shaped how these factors are applied.
Key Employment Status Cases
Fall v Hitchen (1973)
This case considered whether the worker was operating independently or as part of the engager’s organisation. It reinforced that integration into the business is an important indicator of employment status.
Market Investigations Ltd v Minister of Social Security (1969)
This case introduced the principle of asking whether the worker is “in business on their own account.”
The court looked at whether the individual was financially independent, bore business risk, and had the opportunity to profit. This remains a core test when determining self-employment.
Hall v Lorimer (1993)
This case involved a television technician working for multiple clients.
The court emphasised that employment status must be assessed by looking at the whole picture, rather than relying on one factor alone. Working for multiple clients strongly suggested self-employment.
Autoclenz Ltd v Belcher (2011)
This case established that the courts can look beyond the written contract to determine the true nature of the relationship.
Even though the contract described the workers as self-employed, the reality of the working arrangement showed employment characteristics. The Supreme Court held that substance prevails over form.
Uber BV v Aslam (2021)
This landmark Supreme Court case held that Uber drivers were workers, despite being described as self-employed in their contracts.
The court found that Uber exercised significant control over:
Pricing
Terms of service
Driver performance
The decision reinforced that the practical reality of control and dependency matters more than contractual wording.
Final Thoughts
Determining whether a worker is employed or self-employed is a complex area governed by HMRC guidance and decades of case law.
While written contracts are important, HMRC will always look at the actual working relationship, particularly:
Mutuality of obligation
Personal service
Control
Financial risk
Business independence
Getting employment status wrong can result in:
Unexpected PAYE liabilities
National Insurance arrears
Interest and penalties
Employment law disputes
If you are unsure about the employment status of a worker, professional advice can help ensure you remain compliant and avoid costly mistakes.
Get in touch:
📧 hello@surreyhillstax.co.uk
📞 01483 970 410