Part-time working is now a core feature of the UK labour market. Across England and Wales, millions of employees work reduced hours for reasons ranging from childcare and study to health needs and lifestyle choices. Overtime opportunities can therefore be an important way for part-time workers to increase earnings and gain flexibility.
But what happens when an employer refuses to offer overtime to a part-time employee?
Is that lawful, or could it amount to unfair treatment?
The answer depends on the contract, the workplace arrangement, and whether the refusal can be objectively justified. While employers often have discretion over overtime allocation, that discretion is not unlimited.
At Blackstone Solicitors, we advise employees and employers across England and Wales on part-time worker rights, overtime disputes and employment law claims. This article explains when an employer can refuse overtime to part-time workers, when it may be unlawful, and what legal protections apply in 2026.
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Understanding Overtime in Employment Law
Overtime refers to hours worked beyond an employee’s contractual working time. It is usually offered when there is:
- Increased workload
- Staff shortages
- Seasonal demand
- Project deadlines
- Unexpected operational pressures
Importantly, there is no automatic legal right to overtime unless it is written into the employment contract or consistently offered in practice.
This means the starting point is contractual. If the contract does not guarantee overtime, employers usually retain discretion over whether to offer it.
However, that discretion must still comply with employment law principles.
Do Part-Time Workers Have a Right to Overtime?
There is no general statutory right for part-time workers to be offered overtime.
However, part-time workers are protected by the Part-time Workers (Prevention of Less Favourable Treatment) Regulations 2000.
These regulations state that part-time employees must not be treated less favourably than comparable full-time employees unless the employer can objectively justify the difference.
This is where overtime decisions become legally sensitive.
If full-time staff are routinely offered overtime but part-time staff are systematically excluded without justification, this may give rise to a legal claim.
When Can an Employer Refuse Overtime?
Employers can refuse to offer overtime in a number of lawful situations, including:
- No operational need for additional hours
- Budgetary constraints
- Business restructuring
- Skills or qualifications required for the overtime work
- Fair rotation among staff
- Health and safety concerns relating to working hours
If overtime is genuinely discretionary, employers are generally free to decide how it is allocated.
However, problems arise when refusal is inconsistent, discriminatory or based on unfair assumptions about part-time workers.
The Key Legal Principle: Less Favourable Treatment
Under part-time worker regulations, employers must not treat part-time employees less favourably than full-time employees doing comparable work.
In the context of overtime, this means:
- Part-time workers should not be excluded from overtime opportunities simply because they are part-time
- Employers must consider part-time workers fairly when allocating additional hours
- Any difference in treatment must be objectively justified
Less favourable treatment does not need to be intentional. It can arise from workplace practices, policies or informal decision making.
Overtime and Indirect Discrimination Risks
Refusing overtime to part-time workers can sometimes overlap with discrimination law under the Equality Act 2010.
For example, part-time working arrangements are more common among:
- Women with childcare responsibilities
- Disabled employees
- Older workers
If a policy or practice disproportionately disadvantages a protected group, it may amount to indirect discrimination unless it can be justified.
This means overtime allocation decisions can carry legal risk even where there is no direct intention to discriminate.
Contractual Terms and Overtime Rights
The employment contract is central to understanding overtime rights.
Contracts may:
- Guarantee overtime in certain roles
- Offer overtime at the employer’s discretion
- Require employees to work overtime when reasonably requested
- Restrict overtime to specific roles or grades
If overtime is contractual, refusal may breach the contract.
If overtime is discretionary, employers have more flexibility, but must still avoid discriminatory or unfair practices.
Some workplaces also develop custom and practice overtime arrangements, where consistent historical behaviour may create implied rights over time.
Can Employers Prioritise Full-Time Staff for Overtime?
Employers sometimes argue that full-time staff should be prioritised for overtime to maintain fairness or operational continuity.
This may be lawful in certain circumstances, but only if it can be objectively justified.
For example:
- Ensuring continuity on complex projects
- Matching skills or experience levels
- Managing fatigue and working time limits
- Maintaining consistency in customer facing roles
However, a blanket rule excluding part-time workers is unlikely to be lawful unless there is a strong justification.
Each case must be assessed on its own facts.
Health and Safety and Working Time Limits
Employers are required to comply with the Working Time Regulations 1998.
These rules limit:
- Weekly working hours
- Rest breaks
- Night work
- Daily and weekly rest periods
Even if a part-time worker wants overtime, an employer may lawfully refuse if the additional hours would breach working time limits.
This is particularly relevant where employees already work multiple jobs or irregular shifts.
What if Overtime Is Consistently Given to Full-Time Staff Only?
This is where legal issues often arise.
If full-time employees regularly receive overtime opportunities while part-time employees do not, questions may arise about:
- Whether the practice is discriminatory
- Whether it amounts to less favourable treatment
- Whether it can be objectively justified
Tribunals will look at the overall pattern of behaviour, not just isolated decisions.
A consistent exclusion of part-time staff may be unlawful unless the employer can show a valid reason.
What Evidence Is Important in Overtime Disputes?
Evidence is crucial in determining whether an employer has acted lawfully.
Useful evidence includes:
- Overtime rotas or schedules
- Emails or messages offering overtime
- Payroll records showing overtime patterns
- Job descriptions and contracts
- Comparisons between part-time and full-time staff
- Internal policies on overtime allocation
Patterns often matter more than individual incidents.
A clear imbalance between part-time and full-time staff can support a legal claim.
Can Refusing Overtime Amount to Victimisation?
In some cases, yes.
If a worker raises concerns about discrimination or legal rights and is then denied overtime as a result, this may amount to victimisation under the Equality Act 2010.
Examples include:
- Refusing overtime after a grievance is raised
- Reducing overtime opportunities following complaints
- Penalising employees for asserting statutory rights
Victimisation claims do not require long service and can be brought from day one of employment.
When Refusal of Overtime Is Likely to Be Lawful
An employer is generally on safer legal ground when:
- Overtime is genuinely discretionary
- Decisions are made fairly and consistently
- Selection is based on objective criteria
- Business needs clearly justify the approach
- There is no pattern of disadvantaging part-time workers
Transparency is key. Employers should be able to explain how overtime decisions are made.
What Should Part-Time Workers Do if Refused Overtime?
If you believe you are being unfairly excluded from overtime, practical steps include:
- Asking for the reason in writing
- Checking your employment contract
- Reviewing overtime patterns across the team
- Keeping a record of requests and refusals
- Raising the issue informally first
- Submitting a formal grievance if necessary
Clear communication often resolves misunderstandings early.
However, where patterns of unfair treatment exist, legal advice may be necessary.
Can You Bring a Legal Claim?
Depending on the circumstances, part-time workers may bring claims such as:
- Less favourable treatment under part-time worker regulations
- Indirect discrimination under the Equality Act 2010
- Breach of contract
- Victimisation claims
- Constructive dismissal (in serious cases)
Time limits for Employment Tribunal claims are strict, usually three months less one day from the last act complained of.
Early advice is essential.
How Employers Should Manage Overtime Fairly
To reduce legal risk, employers should:
- Have a clear overtime policy
- Apply rules consistently across staff groups
- Keep written records of decisions
- Avoid automatic exclusion of part-time staff
- Ensure decisions are objectively justified
- Train managers on equality obligations
Fairness and transparency reduce disputes and improve workplace trust.
How Blackstone Solicitors Can Help
At Blackstone Solicitors, we advise both employees and employers across England and Wales on part-time worker rights and overtime disputes.
We assist with:
- Overtime refusal disputes
- Part-time worker claims
- Discrimination cases
- Employment Tribunal representation
- Contract interpretation
- Workplace policy advice
- Settlement negotiations
We provide clear, practical legal guidance tailored to real workplace issues.
Final Thoughts
There is no absolute legal right for part-time workers to be offered overtime. However, that does not mean employers have unlimited freedom to refuse it.
Where full-time staff are regularly offered overtime and part-time staff are excluded without objective justification, legal issues may arise. The key question is always whether the treatment is fair, consistent and lawful.
Employment law in England and Wales is designed to ensure that part-time workers are not disadvantaged simply because they work fewer hours.
If you are being denied overtime opportunities, it is worth examining the wider pattern of treatment. In many cases, what appears to be a simple staffing decision may have significant legal implications.
How to Contact Our Employment Law Solicitors
It is important for you to be well informed about the issues and possible implications of Employment Law. However, expert legal support is crucial in terms of ensuring a positive outcome to your case.
To speak to our Employment law solicitors today, simply call us on 0345 901 0445, or click here to make a free enquiry. We are well known across the country and can assist wherever you are based. We also have offices based in Cheshire and London.
Please visit our website to see all the Employment Law services we offer: https://blackstonesolicitorsltd.co.uk/employment-law-services/
Disclaimer: This article provides general information only and does not constitute legal advice on any individual circumstances.
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