Zero-Hour Contract
An employment agreement where the employer is not obligated to provide a minimum number of working hours and the worker is not obligated to accept any hours offered.
- What Is a Zero-Hour Contract?
- Industries That Use Zero-Hour Contracts
- Pros and Cons of Zero-Hour Contracts
- Zero-Hour Contract Worker Rights
- Zero-Hour Contract Laws by Country
- What Employers Should Consider Before Using Zero-Hour Contracts
- Financial Impact on Zero-Hour Contract Workers
- UK Employment Rights Bill and Zero-Hour Contract Reforms
- Best Practices for Managing Zero-Hour Workers
- Frequently Asked Questions About Zero-Hour Contracts
What Is a Zero-Hour Contract?
Key Takeaways
- ✓A zero-hour contract is an employment arrangement with no guaranteed minimum working hours.
- ✓The employer offers shifts or work as needed, and the worker can accept or decline.
- ✓About 1.03 million UK workers (3.2% of the workforce) are on zero-hour contracts as of late 2024.
- ✓Workers on zero-hour contracts retain statutory employment rights, including minimum wage and paid holidays.
- ✓Exclusivity clauses in zero-hour contracts have been banned in the UK since 2015.
A zero-hour contract (sometimes called a casual contract) is an employment agreement that doesn't guarantee any minimum number of working hours per week or month. The employer offers work when it's available, and the worker can choose to accept or decline each offer. Neither side has a binding obligation: the employer doesn't have to provide hours, and the worker doesn't have to accept them.
How zero-hour contracts actually work
In practice, the employer contacts the worker (often via text, app notification, or scheduling software) when shifts become available. The worker decides whether to take each shift. Some weeks a worker might get 30 hours; other weeks, zero. Pay is based only on hours actually worked. Most zero-hour workers have "worker" or "employee" status under UK employment law, which means they're entitled to the national minimum wage, paid annual leave (calculated on hours worked), rest breaks, and protection against discrimination.
Where the term comes from
Zero-hour contracts have existed informally for decades under names like "casual work" or "on-call arrangements." The term became widely used in UK public and media discourse around 2013, when reports revealed that major employers like Sports Direct and McDonald's had hundreds of thousands of workers on these arrangements. The term isn't a formal legal category in most jurisdictions. In the UK, it's become a shorthand for any contract without guaranteed hours.
Industries That Use Zero-Hour Contracts
Zero-hour contracts are concentrated in industries with unpredictable or seasonal demand. The Office for National Statistics (ONS) data shows clear patterns in where these contracts appear most frequently.
Hospitality and food service
Hotels, restaurants, pubs, and catering companies are the heaviest users. Demand fluctuates by day of the week, season, and event schedules. Around 25% of zero-hour contract workers are in accommodation and food services (ONS, 2024). Large chains like Wetherspoons and Premier Inn rely on zero-hour contracts to match staffing levels to occupancy and booking volume.
Health and social care
Care homes, home care agencies, and NHS trusts use zero-hour contracts for care workers, support staff, and agency nurses. The care sector accounts for roughly 14% of all zero-hour contract workers. Demand varies with patient census, and agencies use zero-hour contracts to build a pool of workers who can cover shifts at short notice. This is particularly common in domiciliary care, where the number of visits changes daily.
Retail
Retail employers use zero-hour contracts to staff up for peak periods like Black Friday, Christmas, and summer sales without committing to permanent headcount. About 10% of zero-hour contract workers are in retail. Some retailers have faced criticism for using zero-hour contracts for roles that are effectively full-time but classified as casual to avoid benefits obligations.
Education
Universities and colleges use zero-hour contracts extensively for hourly-paid lecturers, tutors, exam invigilators, and student support staff. UCU (University and College Union) research found that 76,000 academic staff in UK higher education are on some form of insecure contract, including zero-hour arrangements. Term-time-only demand makes this structure attractive to institutions, but it creates income instability for academic workers.
Delivery and logistics
Courier companies, warehouse operators, and gig-economy-adjacent businesses use zero-hour or similar arrangements to scale staffing with order volume. While many gig workers are technically self-employed rather than on zero-hour contracts, the practical experience of variable hours and no guaranteed income is similar.
Pros and Cons of Zero-Hour Contracts
Zero-hour contracts involve genuine trade-offs for both employers and workers. The same features that create flexibility for one party can create insecurity for the other.
The flexibility argument
Proponents point out that 64% of zero-hour contract workers say they don't want more hours (ONS, 2024). Many are students, retirees, or people with caregiving responsibilities who value the ability to choose when they work. Critics counter that this statistic masks workers who have adjusted their expectations downward because they've learned that requesting more hours doesn't lead to getting them.
The exploitation argument
Workers' rights organizations argue that the imbalance of power is the core problem. Technically, workers can decline shifts. But in practice, many fear that saying no will result in fewer future offers. The Resolution Foundation found that zero-hour contract workers earn 38% less per hour on average than permanent staff doing comparable work, even after controlling for job type and experience. This suggests the flexibility isn't truly voluntary for everyone.
| Perspective | Advantages | Disadvantages |
|---|---|---|
| For workers | Flexibility to decline shifts, freedom to work for multiple employers, useful for students or semi-retired people who want variable schedules | No guaranteed income, difficulty getting mortgages or loans, potential pressure to accept all shifts to avoid losing future offers |
| For employers | Ability to scale staffing to demand, lower fixed labor costs, access to a larger pool of available workers | Lower worker loyalty and engagement, higher turnover, reputational risk, potential legal challenges under evolving regulations |
| For the economy | Lower unemployment statistics, labor market flexibility, reduced barriers to entry-level employment | Income inequality, reduced consumer spending power due to income unpredictability, potential strain on social safety nets |
Zero-Hour Contract Worker Rights
Despite the lack of guaranteed hours, workers on zero-hour contracts in the UK have significant statutory protections. Many workers and employers are unaware of these rights, leading to violations.
Minimum wage
Zero-hour contract workers must be paid at least the National Minimum Wage (or National Living Wage for workers aged 21+) for every hour worked. As of April 2024, the National Living Wage is 11.44 per hour. Waiting time that the employer requires (being on-site but not actively working) generally counts as working time and must be paid. Unpaid "trial shifts" lasting more than a reasonable assessment period may violate minimum wage law.
Paid annual leave
Zero-hour workers are entitled to 5.6 weeks of paid annual leave per year, calculated proportionally based on hours worked. In practice, many employers "roll up" holiday pay into the hourly rate (adding a 12.07% supplement). Since the 2022 Harpur Trust v Brazel Supreme Court ruling, holiday pay for irregular-hours workers must be calculated based on average earnings over a 52-week reference period, which can result in higher holiday pay than the rolled-up method provides.
No exclusivity
Since 2015, exclusivity clauses in zero-hour contracts are unenforceable. Employers cannot require zero-hour workers to work exclusively for them, and they cannot penalize workers for taking work elsewhere. Workers are free to have multiple zero-hour contracts with different employers simultaneously.
Protection from unfair treatment
Employers cannot subject zero-hour workers to detriment (reduced shifts, worse assignments) for seeking work elsewhere, refusing a particular shift, or raising a workplace grievance. Zero-hour workers with "employee" status also gain unfair dismissal protection after two years of continuous service, and protection from discrimination from day one.
Rest breaks and working time
The Working Time Regulations apply to zero-hour workers. They're entitled to 11 consecutive hours of rest between working days, a 20-minute break during any shift exceeding 6 hours, and no more than 48 hours of work per week on average (unless they've opted out in writing). These protections exist regardless of how few guaranteed hours the contract provides.
Zero-Hour Contract Laws by Country
The legal treatment of zero-hour contracts varies significantly across jurisdictions. Some countries permit them with protections, others restrict them heavily, and a few have banned them outright.
United Kingdom
Zero-hour contracts are legal and widely used. Key regulations include the ban on exclusivity clauses (2015), the right to paid annual leave proportional to hours worked, and the requirement to pay at least the national minimum wage. The UK government's 2024 Employment Rights Bill proposes giving zero-hour workers the right to request a contract reflecting their regular hours after 12 weeks, though this legislation is still being finalized.
Ireland
The Employment (Miscellaneous Provisions) Act 2018 effectively banned zero-hour contracts for most workers. Employers must provide employees with a written statement of their core terms within 5 days of starting work, including expected hours. "If and when" contracts (the Irish equivalent of zero-hour contracts) are restricted: employers must compensate workers for at least 25% of the hours they were expected to work, or 15 hours, whichever is less, if called in but given no work.
New Zealand
The Employment Relations Amendment Act 2016 banned zero-hour contracts. Employers must specify guaranteed minimum hours in employment agreements. Workers can decline additional hours beyond the guaranteed minimum. The ban was driven by public outcry over fast-food chains using zero-hour arrangements for workers who were effectively full-time.
Australia
Zero-hour contracts don't exist as a formal category, but "casual employment" serves a similar function. The Fair Work Act 2009 (amended in 2021) defines casual employees and gives them the right to convert to permanent employment after 12 months of regular work patterns. Casual employees receive a 25% casual loading on top of the base hourly rate to compensate for the lack of paid leave and other entitlements.
United States
There's no federal law specifically addressing zero-hour contracts. "At-will" employment in most states allows employers to schedule zero hours without violating any statute. However, some states and cities have enacted predictive scheduling laws. Oregon's Fair Work Week Act (2017) requires retail and food service employers to provide schedules 14 days in advance and pay premiums for last-minute changes. New York City, San Francisco, Chicago, and Philadelphia have similar ordinances.
What Employers Should Consider Before Using Zero-Hour Contracts
Zero-hour contracts can be a legitimate staffing tool, but they come with legal, reputational, and operational risks that employers need to weigh carefully.
When zero-hour contracts make sense
Genuine demand variability is the clearest justification. Event catering companies, seasonal hospitality businesses, and organizations with unpredictable call volumes have legitimate reasons to maintain a flexible workforce. The contract makes sense when the work truly is irregular and the worker genuinely values the flexibility. It doesn't make sense when the role has predictable, consistent hours but the employer wants to avoid commitments.
Reputational risk
Public perception of zero-hour contracts has shifted significantly since 2013, when media coverage of Sports Direct and other large employers created a backlash. Employer brand research from Glassdoor shows that companies known for heavy zero-hour contract use receive lower ratings from both current and potential employees. In competitive labor markets, this perception can make recruiting harder and more expensive.
The hidden costs
Zero-hour contracts appear cheaper because there's no commitment to pay for idle time. But the hidden costs add up. Higher turnover means more recruitment and training expense. Lower engagement leads to lower productivity per hour worked. Scheduling complexity requires management time. And the administrative burden of tracking variable hours, holiday pay accrual, and pension auto-enrollment for a large pool of casual workers can exceed the savings from flexibility.
Alternatives to consider
Before defaulting to zero-hour contracts, employers should consider whether other arrangements achieve the same flexibility with fewer downsides. Minimum-hours contracts (e.g., 8 hours per week guaranteed, with overtime available) give workers baseline income stability while preserving employer flexibility. Annualized hours contracts spread a fixed number of hours across the year, with busy and quiet periods planned in advance. Job-sharing and part-time permanent roles offer structured flexibility without the stigma of zero-hour arrangements.
Financial Impact on Zero-Hour Contract Workers
The income volatility of zero-hour contracts creates ripple effects across workers' financial lives that go beyond the weekly paycheck.
Income unpredictability
CIPD research (2024) found that zero-hour contract workers earn an average of 16 hours per week, but the week-to-week variation is significant. Some weeks deliver 30+ hours; others deliver none. This makes monthly budgeting extremely difficult. The Resolution Foundation found that one in five zero-hour workers experiences a pay variation of more than 20% from one month to the next.
Access to credit and housing
Mortgage lenders and landlords typically require proof of stable income. Zero-hour contract workers struggle to provide this. Many lenders require 12 months of payslips showing consistent earnings, which irregular-hours workers simply can't produce. Shelter (the UK housing charity) reports that private landlords frequently reject tenants on zero-hour contracts, pushing them toward more expensive or lower-quality housing options.
Benefits gap
While zero-hour workers have statutory rights to paid leave and pension auto-enrollment, they often miss out on employer-provided benefits that permanent staff receive: company sick pay beyond statutory minimums, enhanced parental leave, training and development budgets, and health insurance or wellbeing programs. This creates a two-tier workforce within the same organization.
Impact on state benefits
In the UK, fluctuating income complicates interactions with Universal Credit and other means-tested benefits. When hours increase, benefit payments decrease, but with a time lag that creates cash flow problems. When hours drop suddenly, reclaiming benefits takes time. The Resolution Foundation describes this as a "benefits roller-coaster" that adds stress and administrative burden on top of the financial instability.
UK Employment Rights Bill and Zero-Hour Contract Reforms
The UK government's Employment Rights Bill (introduced October 2024) proposes the most significant changes to zero-hour contract regulation since the exclusivity clause ban in 2015.
Right to guaranteed hours
The bill proposes giving qualifying zero-hour workers the right to request a contract that reflects the hours they regularly work. After a 12-week reference period, workers could request a contract with guaranteed hours matching their average. Employers would need a valid business reason to refuse. This doesn't ban zero-hour contracts outright, but it gives workers who have settled into a regular pattern the ability to convert to a more stable arrangement.
Reasonable notice of shifts
Employers would be required to give reasonable notice of shifts and working time. Last-minute scheduling (texting a worker at 6am to start a shift at 8am) would be restricted. Workers would also have the right to compensation for shifts cancelled at short notice, reflecting the disruption and lost earnings from sudden schedule changes.
What this means for employers
If enacted as proposed, employers relying heavily on zero-hour contracts will need to review their workforce structure. Workers with regular patterns may convert to guaranteed-hours contracts, increasing fixed labor costs. Scheduling practices will need to change to meet notice requirements. Payroll and HR systems will need to track reference periods and trigger the right to request guaranteed hours automatically. The timeline for implementation is expected to be 2026-2027.
Best Practices for Managing Zero-Hour Workers
Organizations that use zero-hour contracts ethically and effectively follow clear principles that balance business flexibility with fair treatment of workers.
- Offer shifts fairly: Use a transparent rota system rather than giving the best shifts to favored workers. Some employers use scheduling software that distributes hours based on availability, skills, and equitable rotation.
- Communicate early: Give as much advance notice of shifts as possible. The CIPD recommends at least one week's notice as a minimum standard, even when not legally required.
- Pay accurately: Calculate holiday pay correctly using the 52-week reference period method. Don't rely on rolled-up holiday pay unless you've verified it meets current legal requirements.
- Provide training: Include zero-hour workers in training and development programs. Excluding them creates a skills gap and signals that they're disposable.
- Review regularly: Assess whether workers on zero-hour contracts are working regular hours. If someone has consistently worked 20+ hours per week for 3 months, offer them a permanent part-time contract.
- Be honest in recruitment: Don't advertise a zero-hour role as if it comes with regular hours. Set clear expectations about the nature of the arrangement during hiring.
- Track and report: Monitor the proportion of your workforce on zero-hour contracts, their average hours, pay rates compared to permanent staff, and turnover rates. Use this data to evaluate whether the model is working.
Frequently Asked Questions
What is a zero-hour contract in simple terms?
Can you refuse work on a zero-hour contract?
Do zero-hour workers get holiday pay?
Are zero-hour contracts legal in the US?
Can you get a mortgage on a zero-hour contract?
How many people are on zero-hour contracts in the UK?
Can a zero-hour contract become permanent?
Written by Adithyan RK