UK Sick Leave Rules for Zero-Hour and Part-Time Workers: A Complete 2026 Guide

Getting a positive flu test or waking up too unwell to stand up is stressful enough without wondering whether you'll be paid for the days you miss. If you're on a zero-hour contract or working part-time hours, the UK sick leave rules for zero-hour and part-time workers can feel murky compared to the clear-cut policies salaried staff get. The good news: you almost certainly have rights, and statutory sick pay zero hours contract entitlement is often available even if your hours change every week. This guide walks through who qualifies, how much you'll get, what changed in 2026, and what to do if your employer refuses to pay.

What Are the UK Sick Leave Rules for Zero-Hour and Part-Time Workers?

Zero-hour and part-time workers in the UK are covered by the same statutory sick pay (SSP) system as anyone else, but the rules that decide whether you qualify are based on your earnings and employment history rather than your job title. There is no separate "zero-hour sick pay" scheme and no automatic exclusion for casual staff. What matters is:

• Whether you're classed as an employee or a worker under UK law
• Whether your average weekly earnings meet the lower earnings limit
• Whether you've been off sick for at least four days in a row (the "period of incapacity for work")
• Whether you've told your employer in time and provided the right proof of illness

Many casual workers assume that because their hours are irregular, they fall outside the system entirely. That's rarely true. If you earn enough on average and meet the other conditions, GOV.UK confirms you're entitled to SSP regardless of whether your contract says "zero hours," "casual," or "part-time." The contract label doesn't remove your rights, though it can affect how your average earnings are calculated, which we'll get into below.

Employment Status: Worker vs Employee and Why It Matters for Sick Pay

UK employment law recognises three main categories: employee, worker, and self-employed. Zero-hour staff are usually classed as "workers," not employees, because there's no obligation for the employer to offer shifts or for the worker to accept them. This distinction matters for some rights, such as unfair dismissal protection, but it generally does not block access to statutory sick pay.

SSP eligibility is not based on being an employee. It's based on whether you're doing work under a contract (written or verbal) and paying Class 1 National Insurance contributions through PAYE. That means most zero-hour workers, casual staff, bank workers in care or hospitality, and part-time employees all sit inside the SSP system, side by side with full-time permanent staff.

Where employment status genuinely changes things is with occupational sick pay , the improved, employer-funded sick pay some companies offer on top of SSP. Occupational schemes are contractual, not statutory, so an employer can restrict them to employees only, or require a minimum length of service. Always check your contract or staff handbook, because two people doing the same job for the same company (one on a zero-hour contract, one salaried) can have very different total sick pay if occupational sick pay is only offered to permanent employees.

Casual Worker Rights at a Glance

• Right to SSP if earnings and other conditions are met
• Right to request a fit note or medical certificate for absences over seven days
• Right to accrued holiday pay based on hours actually worked
• No automatic right to occupational (contractual) sick pay unless stated in your agreement

Statutory Sick Pay Eligibility for Zero-Hour and Part-Time Workers

To qualify for statutory sick pay as a zero-hour or part-time worker, you need to satisfy four conditions set by HMRC and confirmed on GOV.UK:

1. You're classed as an employee or worker and have done work for your employer under a contract.
2. You've been sick for four or more days in a row , including non-working days such as weekends. This is called a period of incapacity for work (PIW).
3. Your average weekly earnings meet the lower earnings limit , which is £125 per week for the 2025/26 tax year (reviewed annually).
4. You've correctly notified your employer of your sickness within the time limit set out in your contract, or within seven days if no time limit is specified.

Notice that there's no minimum length of service requirement for SSP. Unlike some employment rights that only kick in after continuous employment of one or two years, sick pay can apply from your very first shift, as long as your average earnings clear the threshold and you've genuinely been working under an employment contract with that employer.

This is where irregular hours cause the most confusion. If you only worked two shifts last month and none the month before, your "average weekly earnings" might dip under £125, meaning you wouldn't qualify for that particular sick spell even though you'd have qualified during a busier stretch. Eligibility is assessed fresh each time based on a specific eight-week reference period, not a permanent status.

SSP Rates, Qualifying Days and a Worked Calculation Example

Statutory sick pay is not a percentage of your usual wage. It's a flat weekly rate, currently £118.75 per week for 2025/26 (rates are reviewed each April, so always check the current HMRC figure). SSP is payable for up to 28 weeks per period of sickness, spread across your qualifying days , the days you'd normally be scheduled to work.

What Are Qualifying Days?

Qualifying days are the days you and your employer agree you'd normally work. For someone with a fixed part-time pattern (say, every Tuesday and Thursday), qualifying days are simple to identify. For zero-hour workers with no fixed pattern, employers typically look at the days actually worked in recent weeks to establish a reasonable pattern, or use a weekly average.

Worked Example: Calculating SSP for Genuinely Irregular Hours

Here's the calculation most guides skip. Say Priya works casual shifts at a care agency. Her hours over the previous eight weeks looked like this:

Total earnings across the eight weeks: £1,320.00. To find her average weekly earnings, divide by 8: £165.00 per week . Since this is above the £125 lower earnings limit, Priya qualifies for SSP.

Because SSP is a flat rate rather than a percentage of pay, Priya doesn't get 80% or 90% of her average earnings , she gets the standard weekly SSP rate of £118.75, divided across her qualifying days for that particular week. If her contract treats three days a week as her normal working pattern, and she's sick for all three, she's paid £118.75 divided by three qualifying days, then multiplied by the days she was actually off (after the waiting period, covered next). This is the exact arithmetic competitors tend to skip, and it's worth writing down for your own records if you're ever unsure what you've been paid.

Waiting Days: When Does Sick Pay Actually Start?

Under current rules, SSP doesn't pay out for the first three "waiting days" of sickness. It only becomes payable from the fourth qualifying day onward, once you've had at least four consecutive days of illness (weekends and non-work days count toward this four-day total, even though they're not waiting days themselves). If you're off for four days and three of them are waiting days, you'd only receive one day's worth of SSP.

Statutory Sick Pay Changes in 2026

Sick pay rules are shifting under the Employment Rights Bill, which the Department for Business and Trade has been progressing through Parliament. Two changes matter most for zero-hour and part-time workers:

• Removal of the lower earnings limit as a hard cutoff. Under the reformed system, workers earning below £125 a week will still get SSP, calculated as a percentage of their normal weekly earnings rather than being excluded entirely. This directly benefits casual and low-hour staff who previously fell through the gap.
• Day-one sick pay. The three-day waiting period is being scrapped, meaning eligible workers can be paid from the first day of illness rather than the fourth.

These reforms are aimed squarely at the group most affected by the old system: people with fluctuating, low, or unpredictable hours. If you're a zero-hour worker who's previously been told you "don't earn enough" to qualify, it's worth checking the current HMRC guidance each year, since the earnings rules and rates are reassessed annually and the 2026 reforms are being phased in. Acas and GOV.UK both publish updated guidance when the rate or rules change, so bookmark those sources rather than relying on older blog posts.

How to Claim Sick Pay: Notification, Self-Certification and Fit Notes

Claiming SSP is a process, not an automatic payment, and missing a step is one of the most common reasons casual workers get turned down. Here's the order of operations:

1. Tell your employer promptly. Check your contract for the exact deadline and method (phone call, text, email, or an app). If nothing is specified, you must notify them within seven days of the first day of sickness.
2. Self-certify for the first seven days. You don't need a doctor's note for a short illness. You simply confirm to your employer that you were unwell, sometimes using a self-certification form (SC2), though many employers now accept a text or email.
3. Get a fit note (formerly "sick note") if you're off more than seven days. This can be issued by a GP, a nurse, an occupational therapist, a pharmacist in some services, or through a licensed online provider. It states whether you're "not fit for work" or "may be fit for work" with adjustments.
4. Submit the fit note to your employer as soon as you have it, so payroll can process your SSP without delay.

If you're a zero-hour worker between shifts and can't get a same-day GP appointment, this is where a fast, GDPR-compliant option becomes genuinely useful rather than a shortcut. Get Medical Certificate issues licensed sick certificates online in minutes, which is often the difference between submitting your fit note on time and missing your employer's notification deadline entirely.

Keep a simple record of every message you send about your sickness. Casual workers with multiple short-term engagements benefit enormously from a paper trail, especially if a dispute over SSP eligibility comes up later.

Agency Workers, Umbrella Companies and Students on Zero-Hour Contracts

A large share of the UK's casual workforce doesn't work directly for the business they're doing shifts at. Understanding who actually owes you SSP in these arrangements avoids a lot of wasted phone calls.

Agency Workers

If you're supplied to a workplace through a recruitment agency, the agency is usually your employer for SSP purposes, not the business where you're doing the shift. Your average weekly earnings are calculated using pay from that agency, which can include multiple assignments if they're continuous or close together. If you've moved between agencies recently, ask each one directly who is responsible for your SSP claim, since gaps in engagement can affect your qualifying period.

Umbrella Company Workers

Contractors and temporary staff paid through an umbrella company are technically employees of the umbrella company, which makes them responsible for processing SSP, not the end client. Umbrella companies are legally required to pay SSP if you meet the standard eligibility conditions, so if you're told "we don't do sick pay," that's worth challenging, because it isn't accurate under current HMRC rules.

Students on Zero-Hour Contracts

Being a student doesn't disqualify you from SSP. If you're paying Class 1 National Insurance through PAYE and your average earnings across your working weeks meet the lower earnings limit, you qualify the same as anyone else. Students often work fewer hours in term time, which can genuinely push average earnings below the threshold in some weeks, so it's worth checking your specific eight-week reference period rather than assuming you're excluded because you're "just a student worker."

What to Do If Your Employer Refuses to Pay SSP

Being denied sick pay you're entitled to is frustrating, but there's a clear escalation path, and you don't need a solicitor to start it.

1. Ask for a written reason. Employers must explain in writing why SSP isn't being paid if they refuse. This is often done using form SSP1 , which sets out the reason for refusal (for example, earnings below the limit, or insufficient notice given).
2. Check the reason against your own records. Compare your actual earnings and notification dates against what the SSP1 states. Mistakes in payroll calculations for irregular hours are common.
3. Contact Acas for free, confidential advice. Acas can clarify whether your employer's decision matches the rules and can also offer early conciliation if a dispute escalates.
4. Ask HMRC to make a formal decision. If you and your employer still disagree after raising it directly, you can ask HMRC to rule on your entitlement. HMRC can compel your employer to pay SSP that's genuinely owed.
5. Consider an employment tribunal claim as a last resort, particularly if non-payment is linked to unfair treatment, discrimination, or a broader pattern of denying rights to casual staff. Acas early conciliation is a required step before most tribunal claims can proceed.

Most disputes are resolved at the SSP1 and Acas stage without needing to go further. Employers usually respond quickly once they realise a worker knows the process and has kept a clear record of shifts, notifications, and fit notes.

Frequently Asked Questions

Do zero-hour workers get sick pay in the UK?

Yes. Zero-hour workers can receive statutory sick pay if their average weekly earnings meet the lower earnings limit, they've been sick for four or more consecutive days, and they've notified their employer correctly. There's no automatic exclusion based on contract type.

How much sick pay do I get on a zero-hour contract?

The statutory sick pay rate is £118.75 per week for 2025/26, paid across your qualifying days rather than as a percentage of your normal wage. It's payable for up to 28 weeks.

What's the waiting period before sick pay starts?

Currently there are three unpaid waiting days before SSP kicks in on the fourth qualifying day. Reforms expected from 2026 aim to remove this waiting period, introducing day-one sick pay for eligible workers.

Do part-time workers get less sick pay than full-time workers?

Not necessarily. SSP is based on qualifying days and average earnings, not job title. A part-time worker who meets the earnings threshold gets the same weekly SSP rate as a full-time worker, spread across fewer qualifying days if they work fewer days per week.

Can I get a fit note if I'm a casual or zero-hour worker?

Yes. Anyone off sick for more than seven days can request a fit note, whether from their GP or a licensed online provider such as Get Medical Certificate, which is especially useful for casual workers who need documentation quickly to me