Managing Casual Workers in the UK: an Employer's Guide for 2026

Casual workers keep hospitality, retail, events, care and logistics running. They also generate a disproportionate share of employment disputes, because the rules that govern them are scattered across employment status case law, the Working Time Regulations, minimum wage law and pensions duties, and because the informality that makes casual work flexible also makes it easy to get the paperwork wrong.

This guide walks through the five areas where employers of casual and zero-hours staff most often slip: employment status, holiday entitlement and pay, minimum wage, sick pay and pensions, and finishes with the Employment Rights Act changes on the horizon. Throughout, the theme is the same: casual describes the working pattern, not the legal obligations.

Key takeaways

• Almost every casual worker is at least a worker in law, with day-one rights to holiday pay, minimum wage and payslips.
• Irregular hours workers accrue holiday at 12.07% of hours worked, payable either rolled-up on each payslip or at the 52-week average when leave is taken.
• From April 2026 the National Living Wage is £12.71 for workers aged 21 and over, and statutory sick pay is a day-one right with no earnings floor.
• Auto-enrolment applies to casual staff in any pay period where earnings cross the threshold, so eligibility has to be assessed every run, not once at hiring.
• The Employment Rights Act 2025 will add guaranteed-hours offers and shift notice rights for zero-hours workers, with the main provisions expected from 2027.

Challenge 1: employment status is not what the contract says

UK law recognises three statuses: employee, worker and self-employed, and the label on the contract does not decide which one applies ^[1]. Tribunals look at the reality: who controls the work, whether the person must do it personally, and whether there is a mutual obligation to offer and accept shifts. A casual bartender who turns up when asked, uses your equipment and cannot send a substitute is a worker at minimum, whatever the paperwork calls them.

Worker status carries day-one rights: 5.6 weeks of paid holiday, minimum wage, rest breaks, payslips and pension assessment. Treating casual staff as self-employed to avoid those rights is the single most expensive misclassification in employment law, because back pay for holiday accumulates quietly for years. Our guide to employment status in the UK covers the tests in detail.

Challenge 2: holiday entitlement and pay for irregular hours

For leave years starting on or after 1 April 2024, casual staff who fit the legal definition of irregular hours workers accrue holiday at 12.07% of the hours they work in each pay period, rounded to the nearest hour ^[2]. Paying for that leave can be done two ways: rolled-up holiday pay, a separately itemised 12.07% uplift on every payslip, or the 52-week average of paid weeks when the worker actually takes time off.

The classic failure mode is a hybrid of the two: an hourly rate advertised as including holiday pay, with nothing itemised. That satisfies neither method and leaves the whole liability open. Pick one method per leave year, write it into the contract, and let the payslip prove it. The full rules, including what happens at termination, are in our guide to the rules of holiday pay for casual workers. You can test both methods on real numbers right here:

For questions about days rather than money, including starters, leavers and bank holidays by nation, the holiday entitlement calculator handles the accrual side.

Challenge 3: minimum wage compliance when hours vary

From 1 April 2026 the National Living Wage is £12.71 an hour for workers aged 21 and over, with £10.85 for 18 to 20 year olds and £8.00 for under-18s and apprentices ^[3]. With casual staff the risk is rarely the headline rate; it is the hours that do not make it onto the clock. Time spent on mandatory training, waiting for a delayed shift to start, travelling between work sites during the day, and closing up after the tills are counted all count as working time. Deductions for uniforms or tools can also drag pay below the floor. HMRC's enforcement teams name and fine employers for exactly these patterns every year. Check any rate and deduction combination with our minimum wage calculator.

Challenge 4: sick pay is now a day-one right

The 2026 reforms rewrote statutory sick pay in ways that matter disproportionately for casual workforces. SSP is now payable from the first day of sickness rather than the fourth, and the lower earnings limit has gone, so low-hours staff who previously earned too little to qualify are now entitled to 80% of their average weekly earnings where that is less than the flat weekly rate of £123.25 ^[4]. For employers of casual staff this means two operational changes: you can no longer screen out claims by earnings, and short absences that used to cost nothing now hit the payroll. The mechanics are in our SSP rate guide.

Challenge 5: pensions for people who dip in and out

Auto-enrolment does not care that someone is casual. In any pay period where a worker aged 22 to State Pension age earns above the earnings trigger, pro-rated to the pay frequency, they must be assessed and, if eligible, enrolled ^[5]. Casual earnings oscillate around the trigger, which means assessment is not a hiring-day event but a every-payrun event, complete with postponement notices, opt-out windows and re-enrolment every three years. This is close to impossible to run by hand for a workforce of any size, and it is the area where payroll software earns its keep most visibly.

What the Employment Rights Act 2025 changes next

The Employment Rights Act 2025 ^[6] is being brought into force in stages, and its zero-hours provisions are the ones to watch. Under the government's implementation roadmap, employers will be required to offer guaranteed hours reflecting the hours actually worked over a reference period, to give reasonable notice of shifts, and to compensate workers for shifts cancelled at short notice, with the main duties expected to commence from 2027. The practical preparation is data: if you cannot report the hours each casual worker has averaged over the last twelve weeks, you cannot make a compliant guaranteed-hours offer. Employers who tighten their rota and time-tracking records during 2026 will find the transition uneventful; those who run on message-group rotas will not.

Putting it together: a compliance rhythm that scales

None of these obligations is difficult in isolation; the difficulty is that they all recur, on different cycles, for a workforce that changes weekly. The employers who stay clean tend to share three habits. Every casual worker gets a written statement of terms on or before day one, naming the holiday pay method. Every pay run performs the same checks in the same order: hours in, minimum wage check, holiday accrual or uplift, pension assessment, RTI out. And every quarter someone reviews the workers who have crept into new territory: crossed a pension threshold, accumulated untaken leave, or worked such regular hours that irregular status no longer fits.

Frequently asked questions

Do casual workers get payslips?

Yes. All workers, not just employees, have a right to an itemised payslip showing gross pay, deductions and, where pay varies by time worked, the hours behind it. For staff on rolled-up holiday pay the payslip must also show the 12.07% uplift as its own line.

Can I keep someone on a zero-hours contract indefinitely?

Currently yes, though exclusivity clauses are banned. Once the Employment Rights Act's guaranteed-hours provisions commence, workers whose actual hours are regular will be entitled to an offer reflecting them, which will make indefinite zero-hours arrangements harder to sustain where the reality is steady work.

What happens to accrued holiday when a casual worker stops getting shifts?

If the engagement ends, accrued untaken leave must be paid out at the 52-week average in the final payslip. If the relationship simply goes quiet, the entitlement keeps waiting, which is a reason to process leavers properly rather than letting casual records drift.

Are agency workers my responsibility or the agency's?

The agency usually runs their payroll, holiday pay and pension. But minimum wage liability can attach to the hirer where arrangements are artificial, and after twelve weeks agency workers gain the right to the same basic terms as your direct staff, which is your comparison to evidence.

Run casual payroll without the spreadsheets

Moonworkers was built with variable-hours workforces in mind: 12.07% accrual and rolled-up holiday pay itemised automatically, 52-week averages maintained from your pay history, per-period pension assessment, day-one SSP and RTI filed on every run. If your team mixes salaried staff with casuals, see how Moonworkers handles both in one payrun.