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What Is a Zero-Hours Contract?

Business · September 30, 2023 · Marcus Vale · 6 min

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A clear UK guide to zero-hours contracts: what they are, the rights workers have, what is and is not allowed, the pros and cons, and what employers need to know.

Few employment terms are as widely discussed — and as widely misunderstood — as the zero-hours contract. To some it means useful flexibility; to others it means precarious, unpredictable work. The truth is that zero-hours contracts are a legitimate, legal arrangement with a specific purpose, but they come with rights that protect workers and limits on what employers can do. This guide explains what a zero-hours contract is, the rights that apply, what is and is not allowed, the trade-offs, and what employers should keep in mind. This is general information, not legal advice.

What it is

A zero-hours contract is an employment arrangement in which the employer does not guarantee any minimum number of hours of work, and the individual is paid only for the hours they actually work. Some versions also mean the worker is not obliged to accept the hours offered. In short, there is no promise of regular work on either side.

This contrasts with a fixed-hours contract, where an employee is guaranteed a set number of hours. Under a zero-hours arrangement, the employer offers work as and when it is available, and pay reflects the hours genuinely worked. Such contracts are lawful in the UK and are common in sectors where demand fluctuates, such as hospitality, events, retail and care.

Where zero-hours contracts fit

Zero-hours contracts exist because some work genuinely varies. A seaside café may need far more staff in August than in February; an events company may need crews only when bookings come in; a care provider may need cover at short notice. In these situations a zero-hours arrangement lets the employer match staffing to real demand, and can suit some workers who want flexibility too.

They are part of a wider spectrum of employment options. When deciding how to take on people, employers weigh up permanent, fixed-term, agency and zero-hours arrangements — a choice worth thinking through carefully as part of hiring your first employee. The key is matching the contract honestly to the nature of the work.

The rights that still apply

A common myth is that "zero hours" means "no rights". That is wrong. Zero-hours workers are entitled to core employment protections, including:

• The National Minimum Wage or National Living Wage for every hour worked. Our explainer on the National Minimum Wage sets out how the rates work.
• Paid holiday, which builds up based on the hours actually worked.
• Rest breaks and limits on working time.
• Protection from unlawful discrimination on grounds such as age, sex, race or disability.
• Itemised payslips and proper handling of pay through PAYE where they are employed.

Depending on their precise employment status — whether they count as a "worker" or an "employee" in law — they may have further rights, and that status turns on the reality of the relationship rather than the contract's label. Many zero-hours staff will also fall within pension auto-enrolment once their earnings are assessed, and may qualify for statutory payments such as Statutory Sick Pay if they meet the conditions.

Calling a contract zero-hours does not switch off employment law. Minimum wage, holiday pay and discrimination protections apply to the hours worked just as they would otherwise.

What employers cannot do

There are clear limits on how zero-hours contracts can be used. Most importantly:

• Exclusivity clauses are banned. A term that stops a zero-hours worker from taking work with another employer is unenforceable in UK law. Because the employer guarantees no hours, the worker must be free to seek income elsewhere — even from competitors.
• You cannot avoid core rights. Labelling a role zero-hours does not remove minimum wage, holiday or discrimination protections.
• You should not disguise regular work. Using a zero-hours contract for what is genuinely a stable, predictable job can misrepresent the relationship and create legal risk if the worker's true status is challenged.

The pros and cons

Zero-hours contracts are neither inherently good nor bad — their value depends on how they are used.

Potential advantages:

• Flexibility for the employer to match staffing to fluctuating demand without committing to guaranteed hours.
• Flexibility for some workers who value being able to accept or decline work around other commitments.
• A way to provide cover for busy periods, absence or one-off events.

Potential drawbacks:

• Income insecurity for workers, who cannot count on a predictable wage.
• Difficulty planning finances, housing or childcare around unpredictable hours.
• Reputational and retention issues for employers who over-use them, as workers may leave for steadier roles.

Because of these tensions, zero-hours contracts have attracted scrutiny and reform over the years. Employers should keep an eye on current law, as rules in this area can change.

Good practice for employers

If a zero-hours contract genuinely fits the work, using it fairly protects both your staff and your business:

1. Use them honestly — for genuinely variable or unpredictable work, not to disguise a regular role.
2. Be clear in writing about how work is offered, how pay is calculated, and how holiday accrues.
3. Never include exclusivity clauses or pressure workers not to take other work.
4. Pay correctly — at least the minimum wage for hours worked, with holiday pay properly calculated.
5. Communicate well — give reasonable notice of shifts where you can, and treat staff fairly.
6. Assess status and pension duties for each person, just as you would for other staff.

If a working relationship ends and there is any dispute, the same employment law framework applies, and matters may sometimes be resolved through tools such as a settlement agreement. Acas offers free, impartial guidance on zero-hours contracts and broader employment questions, and is a good first port of call.

The bottom line

A zero-hours contract is a legal arrangement where the employer guarantees no minimum hours and the worker is paid only for the hours they work. Despite the name, zero-hours workers keep important rights — the minimum wage, paid holiday, rest breaks and protection from discrimination — and exclusivity clauses that bar them from working elsewhere are unenforceable. Used honestly for genuinely variable work and operated fairly, zero-hours contracts can suit both sides; used to disguise regular jobs or dodge rights, they create legal and reputational risk. Match the contract to the real nature of the work, pay correctly, and communicate clearly. This is general information, not legal advice; check GOV.UK and Acas, and take advice for specific situations.

Key takeaways

• A zero-hours contract is an agreement where the employer does not guarantee any minimum hours and the worker is paid only for hours actually worked.
• Zero-hours workers still have important legal rights, including the National Minimum Wage, paid holiday and protection from discrimination.
• Exclusivity clauses that stop a zero-hours worker working elsewhere are unenforceable in the UK.
• They suit genuinely variable or unpredictable work but can leave workers with unstable income, so use them honestly and fairly.
• This is general information, not legal advice — check GOV.UK and Acas, and take advice for specific situations.

Sources

• GOV.UK — Contract types and employer responsibilities
• Acas — Zero-hours contracts
• GOV.UK — National Minimum Wage

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