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Whether you’re an employer hiring casual staff or a worker trying to understand your legal position, this guide covers what UK law says about casual workers. We look at the Employment Rights Act 2025 changes coming in 2027 and how they’ll reshape casual working for organisations across Wales and beyond.
Written by: Damian Phillips, Employment Law Partner, Darwin Gray | Last updated: 20/04/2026 | Reviewed by: Damian Phillips
Contents
Key Takeaways
- “Casual worker” isn’t a legal status. UK employment law recognises employees, workers and the self-employed. The label on a contract doesn’t determine someone’s rights.
- Most casual workers qualify as “workers” and are entitled to the National Living Wage, 5.6 weeks’ paid holiday, rest breaks and protection from discrimination.
- Casual workers can become employees over time if working patterns become regular, without any formal change to their contract.
- Holiday pay rules changed from April 2024. Rolled-up holiday pay is now lawful for irregular hours and part-year workers only, calculated at 12.07% of total pay.
- The Employment Rights Act 2025 will bring a right to guaranteed hours from 2027, requiring employers to offer contracts reflecting actual hours worked after a 12-week reference period.
Casual worker: you’ll hear the phrase used in businesses in all sectors, from care homes to pub kitchens. But UK employment law doesn’t actually recognise “casual worker” as a legal category.
This term is used as shorthand for someone engaged on a flexible, as-needed basis, often without guaranteed hours, fixed shifts or a long-term commitment from either side. Think bar staff picked up for a busy weekend, warehouse operatives brought in for a seasonal rush, or support workers covering ad hoc shifts in a care home. Other terms often used for these types of workers are relief staff, zero hour contract workers, or bank staff.
From a legal standpoint, the label isn’t what matters. It’s the reality of how someone works. An employment tribunal won’t ask “is this person a casual worker?”; it will look at whether they’re an employee, a worker or genuinely self-employed, and that comes down to day-to-day working practices, not what the contract says on its front page.
We see this cause confusion all the time. So let’s walk through how it all works, starting with the status question that underpins everything else.
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Getting employment status right is the single most important thing for any organisation using casual labour. Get it wrong and you could be looking at back-dated holiday pay claims, HMRC penalties and tribunal proceedings. Get it right and you’ve got a flexible model that’s both commercially sound and legally compliant.
UK law splits working people into three categories under the Employment Rights Act 1996. Here’s how they compare:
If a dispute reaches tribunal, the judge won’t just read the contract at face value. They’ll look at what actually happens on the ground. The key factors:
The critical point for employers: a contract that says “casual” or “no mutuality of obligation” won’t protect you if the working reality tells a different story. Tribunals look through contractual labels to the substance of the relationship.
Most casual workers qualify as “workers” under section 230 of the Employment Rights Act 1996, and that brings a significant chunk of employment law protection with it. This doesn’t include everything an employee gets, but more than many organisations realise.
Some entitlements have additional qualifying hurdles:
The following protections don’t extend to casual workers and are reserved for employees:
A word of caution for employers: if someone whose employer wrongly classifies them as a casual worker turns out to be a full employee in law, these protections apply retrospectively. That’s why regular status reviews matter, not just when someone starts, but on an ongoing basis.
There’s no magic number of hours or weeks that flips someone from casual worker to permanent employee. But the shift does happen, and it often happens without anyone consciously deciding it.
Employment status isn’t locked in at the start. It can evolve as working patterns change. What began as a genuinely ad hoc arrangement can quietly morph into an implied employment relationship if the day-to-day reality starts looking more like a permanent role.
These are the patterns we see most often. If several apply, your casual worker may already be an employee in the eyes of the law:
Practical tip: Build in regular status reviews, at least every 12 weeks for casual staff who work frequently. Document your assessment each time. If someone’s been working regular hours for months, it’s worth getting legal advice rather than assuming they’re still “just casual.”
Every casual worker is entitled to a written statement of terms from day one. That requirement applies to both employees and workers, following changes introduced in April 2020.
A well-drafted casual worker agreement should clearly set out:
The contract alone won’t protect you. A clause saying “this is a casual arrangement with no mutuality of obligation” carries limited weight if the working reality contradicts it. Tribunals will look past the wording to what actually happens.
That said, a clear contract still matters. It sets the framework, manages expectations on both sides, and gives you a starting point if a dispute arises. Just don’t rely on it as a substitute for managing the arrangement properly day to day.
Holiday pay causes more disputes involving casual workers than anything else. It’s also where employers most commonly trip up, sometimes for years before anyone notices.
The starting position is clear: all workers (including casual workers) are entitled to 5.6 weeks’ paid holiday per year. For someone working 5 days a week, that’s 28 days. For casual workers with irregular hours, the entitlement is calculated proportionally.
For leave years starting on or after 1 April 2024, holiday entitlement for irregular hours workers and part-year workers is calculated using the 12.07% accrual method:
Rolled-up holiday pay, where you add a percentage on top of the worker’s hourly rate instead of paying them separately when they take leave, is now lawful in specific circumstances.
Since April 2024, employers can use rolled-up holiday pay for:
For anyone else, including workers with regular, fixed hours, rolled-up holiday pay remains unlawful.
Watch out for status drift here too. If a casual worker who started on irregular hours settles into a fixed pattern, say the same three shifts every week, they may no longer qualify as an irregular hours worker. At that point, continuing to use rolled-up holiday pay may become unlawful, and you risk claims for unlawful deduction of wages.
The Employment Rights Act 2025 received Royal Assent on 18 December 2025. It introduces some of the most significant changes to casual and flexible working in a generation. Most provisions affecting casual workers won’t come into force until 2027, but employers need to start preparing now. The key changes in this area are:
This is the headline change. From 2027, employers will need to offer a guaranteed hours contract to qualifying workers at the end of every reference period.
Here’s how it’ll work:
Also from 2027, employers must give reasonable notice of shifts to workers on zero-hours or specified contracts. This covers the days, times and number of hours to be worked, plus reasonable notice of any changes or cancellations. Workers will be entitled to compensation for shifts cancelled, moved or cut short without sufficient notice (the maximum notice period will be 7 days, with specifics set by regulations).
| Change | Expected Date | Impact on Casual Workers |
|---|---|---|
| Day one unfair dismissal rights | January 2027 (6-month qualifying period) | Casual workers who are employees will gain protection much earlier |
| SSP from day one (no earnings threshold or waiting days) | April 2026 | All casual workers will be eligible for sick pay from their first day of illness |
| Tribunal time limits extended to 6 months | October 2026 | More time for workers to bring claims |
| Right to guaranteed hours | 2027 (exact date TBC) | Employers must offer contracts reflecting actual hours after each reference period |
| Shift cancellation compensation | 2027 (exact date TBC) | Payment due for short-notice cancellations or changes |
| Collective agreement opt-out | 2027 | Employers and unions can agree alternative arrangements to replace the statutory guaranteed hours regime |
Preparation Timeline for Employers
2027 may feel distant, but the complexity of these changes, particularly around tracking hours, calculating reference periods, and generating guaranteed hours offers, means organisations using casual labour at scale should be reviewing their systems and processes now.
Casual workers are concentrated in particular sectors, and each one has its own patterns, risks and practical challenges.
Pubs, restaurants, hotels and catering businesses are among the heaviest users of casual labour in the UK. The typical challenges we see:
Retail businesses face similar issues, particularly around:
We’ve advised organisations on casual worker issues for years, and the same errors come up again and again. Here are the ones that do the most damage:
Tip #1: Audit Before the Law Changes
Don’t wait for the guaranteed hours provisions to come into force in 2027. Run an audit of your casual workforce now. Identify who’s working regular patterns, who qualifies as an irregular hours worker, and where your holiday pay methodology might need updating. The organisations that prepare early will save time, money and disruption.
Tip #2: Invest in Time-Tracking
Accurate records of hours worked are the foundation of compliance. They feed into holiday pay calculations, minimum wage checks, Working Time Regulations compliance and, from 2027, the guaranteed hours assessment. If you’re still relying on paper timesheets, it’s time to upgrade.
Tip #3: Train Your Managers
Line managers often create employment status problems without realising it, by putting casual workers on fixed rotas, treating them like permanent staff, or penalising them for declining shifts. Invest in training so your managers understand the legal implications of their day-to-day decisions.
If a casual worker is engaged directly by your organisation (rather than through an agency), you’ll normally need to process their pay through PAYE. This applies even for very short engagements. A single shift can trigger the obligation.
Key payroll considerations:
There’s no formal legal definition. “Casual worker” is a term used to describe someone engaged on a flexible, as-needed basis without guaranteed hours. Legally, what matters is whether they’re classified as an employee, a worker or self-employed, which depends on the reality of the working arrangement rather than labels.
Most qualify as “workers” and are entitled to the National Minimum Wage, 5.6 weeks’ paid holiday, rest breaks, protection from unlawful wage deductions, whistleblowing protection and Equality Act protections. Some additional rights (like pension auto-enrolment) depend on earnings thresholds.
Yes. All workers are entitled to 5.6 weeks’ paid holiday per year. For irregular hours workers, entitlement is calculated using the 12.07% accrual method. Employers can use rolled-up holiday pay (adding 12.07% to each pay packet) for irregular hours and part-year workers, but it must be clearly itemised on payslips.
There’s no automatic trigger point. The risk increases when working patterns become regular, when there’s an expectation of work on both sides, when the worker is integrated into the organisation, and when they’re economically dependent on the engagement. Status can shift gradually without any formal change to the contract.
Yes. Since April 2020, all workers (not just employees) are entitled to a written statement of terms from their first day. A well-drafted casual worker agreement also helps manage expectations and provides a starting point if a dispute arises.
Only if the worker qualifies as an irregular hours worker or part-year worker under the Working Time Regulations. It must be calculated at 12.07% of total pay in each pay period and clearly shown as a separate line on payslips. If the worker’s hours become regular, you need to switch to a different method.
Under the Employment Rights Act 2025, employers will need to assess whether a worker on a zero-hours or low-hours contract has regularly worked more than their contractual minimum during a reference period. That period is expected to be 12 weeks, though the exact length will be confirmed in regulations. At the end of each reference period, qualifying workers must be offered a guaranteed hours contract. This is expected to come into force in 2027.
From April 2026, the Employment Rights Act 2025 will remove the earnings threshold and the 3 waiting days, making SSP a day-one entitlement for all workers.
You can stop offering work, but that doesn’t mean it’s risk-free. Workers are protected from dismissal or detriment for whistleblowing, for exercising statutory rights, and on grounds of discrimination. If the worker is actually an employee, unfair dismissal protections may also apply.
The consequences can be significant: back-dated holiday pay claims, unlawful wage deduction claims, HMRC penalties for incorrect tax treatment, discrimination claims, and if the worker is found to be an employee, potential unfair dismissal liability. Claims from casual workers often involve multiple heads of loss, and group claims can escalate costs quickly.
The main changes: guaranteed hours after a 12-week reference period (from 2027), reasonable notice of shifts (from 2027), compensation for short-notice shift cancellations (from 2027), SSP from day one with no earnings threshold (from April 2026), and extended tribunal time limits to 6 months (from October 2026).
Yes, if they meet the auto-enrolment criteria: aged 22 or over, earning above £10,000 per year, and working in the UK. The employer must enrol qualifying workers and make minimum contributions. Casual status doesn’t remove this obligation.
These terms overlap a lot in practice. A zero-hours contract is a specific type of contract with no guaranteed minimum hours. “Casual worker” is a broader, informal label that can include zero-hours workers but also covers other ad hoc arrangements. Legally, both are assessed by the same employment status tests.
Only if they’re classified as an employee with the required qualifying service (currently 2 years, reducing to 6 months from January 2027). Workers who aren’t employees can still bring claims for whistleblowing detriment, discrimination, or unlawful deduction of wages.
| Term | Definition |
|---|---|
| Worker | A person who has a contract to carry out work or services personally for a reward. Has more rights than self-employed, but fewer than employees. |
| Employee | Someone who works under a contract of employment with full statutory rights including unfair dismissal protection. |
| Self-employed | A person running their own business who contracts with clients/customers. Has limited employment law protections. |
| Mutuality of obligation | The expectation that an employer will offer work and the worker will accept it. A key factor in determining employment status. |
| Rolled-up holiday pay | A method of including holiday pay within regular wages, lawful only for irregular hours and part-year workers since April 2024. |
| 12.07% accrual method | The statutory method for calculating holiday entitlement for irregular hours workers: 12.07% of hours worked accrues as holiday. |
| Employment Rights Act 2025 | Major legislation receiving Royal Assent on 18 December 2025, introducing guaranteed hours, shift notice requirements and other reforms. |
| Reference period | The period (expected to be 12 weeks) used to assess whether a worker qualifies for guaranteed hours under the Employment Rights Act 2025. |
| PAYE | Pay As You Earn. The system through which employers deduct income tax and National Insurance from workers’ wages. |
| Written statement of terms | A document setting out key terms of the working arrangement. All workers are entitled to this from day one. |
| Working Time Regulations 1998 | Legislation governing maximum working hours, rest breaks, and paid annual leave. |
| Unfair dismissal | A claim that an employee was dismissed without a fair reason or fair procedure. Currently requires 2 years’ service. |
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Disclaimer
This guide provides general information about casual workers and UK employment law. It doesn’t constitute legal advice tailored to your specific circumstances. Employment law is complex and fact-sensitive, and the correct approach depends on the particular details of each situation. For advice specific to you, please contact a qualified employment solicitor. This guide reflects the law in England and Wales as of [INSERT DATE]. The Employment Rights Act 2025 provisions discussed are subject to commencement orders and secondary legislation that may affect the detail of implementation.