Zero hours contracts and self employed contracts can both be useful in the right circumstances. They can give businesses flexibility, help manage fluctuating demand and allow people to bring in support without committing to a traditional permanent role straight away.
But they are also two of the most misunderstood working arrangements.
The risk for employers is not usually the contract title itself. It is the gap between what the contract says and what actually happens in practice.
A business may call someone self employed, but if they are managed like an employee, required to work personally, given set hours, integrated into the team and unable to send a substitute, the label may not reflect the reality. Equally, someone on a zero hours contract may still be a worker or an employee, with important legal rights attached.
That distinction matters. Employment status affects rights such as holiday pay, National Minimum Wage, statutory sick pay, notice, redundancy, unfair dismissal protection, discrimination protection and whistleblowing protection. Government guidance makes clear that employment status affects both employment rights and employer responsibilities, and that a contractor may be self employed, a worker, or an employee depending on the real arrangement.
What Is a Zero Hours Contract?
A zero hours contract is usually used where the employer does not guarantee a minimum number of working hours. Work is offered when it is available, and the individual is paid for the hours they actually work.
This can suit some sectors and some individuals. Hospitality, events, care, retail, seasonal work and casual support are common examples. For some people, the flexibility is useful because they are studying, caring, semi retired or working around other commitments.
But zero hours does not mean zero rights.
Someone on a zero hours contract may be legally classed as a worker or an employee. Their rights depend on their employment status, not simply the type of contract used. ACAS confirms that people on zero hours contracts can be employees or workers, and their rights are based on that status.
This is where employers can get caught out. If someone is regularly working for the business, is expected to accept shifts, is managed closely and forms part of the normal workforce, the arrangement may carry more employment protection than the employer realizes.
Zero Hours Contracts Are Changing
Zero hours contracts have also become a major focus of employment law reform.
The Employment Rights Act 2025 introduced changes that will be implemented in stages. ACAS says workers on zero hours and low hours contracts will get the right to guaranteed working hours if they want them, and that this is expected to happen in 2027. Workers will also have the right to be paid if a shift is cancelled, moved to another date or cut short by the employer.
That does not mean zero hours contracts have disappeared. But it does mean employers should be preparing now.
If a business relies heavily on zero hours arrangements, it should review how often people are working, whether their hours have become predictable, how shifts are offered, how much notice is given, and whether the contract still reflects the reality of the working relationship.
The direction of travel is clear. Flexibility will still have a place, but one sided flexibility is becoming harder to justify.
What Is a Self Employed Contract?
A self employed contract is different.
A genuinely self employed person is usually running their own business and providing services to a client. They normally have more control over how the work is done, may work for multiple clients, may provide their own tools or equipment, may carry financial risk, and may have the ability to send someone else to do the work.
They are not usually entitled to the same employment rights as employees or workers. ACAS explains that self employed people have limited employment rights, although they do have protection for health and safety on a client’s premises and protection against discrimination.
That limited rights position is why self employment needs to be used carefully.
A self employed contract should not be used simply because the business wants to avoid payroll, holiday pay, sick pay, pension duties or employment protection. If the person is not genuinely self employed, the contract may not protect the business.
The Problem With Bogus Self Employment
The biggest risk with self employed contracts is misclassification.
This happens when someone is described as self employed, but the reality of the arrangement looks more like worker or employee status.
For example, a business may call someone a contractor, but require them to work set hours, follow detailed instructions, ask permission for time off, use company systems, wear company uniform, attend team meetings and personally carry out the work with no genuine right to send a substitute.
In that situation, a tribunal may look beyond the contract and consider what actually happens in practice.
This issue is particularly visible in the gig economy. More than 7,000 Just Eat couriers have recently brought legal action over worker status, with the tribunal considering whether they are workers or self employed contractors. The outcome matters because worker status would affect rights such as holiday pay and National Minimum Wage.
For smaller employers, the same principle applies. The wording in the contract matters, but conduct matters too.
The Key Difference Between Zero Hours and Self Employed
A zero hours contract is usually still a contract within the employment relationship. The individual may be a worker or an employee, but there is no guaranteed minimum number of hours.
A self employed contract is usually a business to business style arrangement, where the person is providing services as an independent contractor.
The practical difference is control.
With a zero hours worker, the business may still direct the work, set standards, manage shifts and require the individual to do the work personally.
With a genuinely self employed contractor, the business is usually buying an outcome or service, not managing the person in the same way it would manage an employee.
The more control the business has over how, when and where the person works, the harder it may be to argue that they are genuinely self employed.
Why the Contract Alone Is Not Enough
One of the most common mistakes employers make is assuming that the written contract decides everything.
It does not.
A contract can say someone is self employed, but if the working relationship says something different, the written label may be challenged. GOV.UK also makes the important point that someone can be self employed for tax purposes but have a different status in employment law, so employers need to consider both tax status and employment rights.
The same applies to zero hours contracts. If the contract says there is no obligation to offer or accept work, but in practice the person is expected to attend every week and would be penalised for refusing shifts, that may undermine the written position.
Employment status is fact sensitive. Tribunals will look at the whole arrangement, including control, personal service, mutual obligations, integration into the business, financial risk and how the relationship works day to day.
HR Risks for Employers
The HR risks can be significant if the wrong contract is used.
If someone has been treated as self employed but should have been treated as a worker, the business may face claims for holiday pay, National Minimum Wage, unlawful deductions from wages or other worker rights.
If someone has been treated as a casual worker but the reality looks more like employment, there may be wider risks around notice, redundancy, unfair dismissal and statutory payments.
There can also be employee relations issues. People may feel misled if they have worked regularly for a business but are told they have no rights when work ends. Managers may become confused about what they can and cannot ask of different types of staff. Payroll, pensions, insurance and tax treatment may also need careful consideration.
From an HR perspective, the biggest problem is often inconsistency. One manager treats a casual worker like an employee. Another treats a contractor as completely separate. Another allows a self employed person to work almost full time for years with company equipment and a company email address.
Over time, these informal practices create risk.
How Employers Should Approach Flexible Contracts
Employers do not need to avoid zero hours contracts or self employed contractors altogether. The issue is whether the arrangement is appropriate, honest and properly managed.
Before using a zero hours contract, the employer should ask whether the work is genuinely unpredictable. If the person is likely to work regular hours every week, a different arrangement may be more appropriate.
If the business does use zero hours contracts, workers should understand how shifts are offered, whether they can refuse work, how holiday pay is dealt with, what notice they will receive and what happens if shifts are cancelled.
Before using a self employed contract, the employer should ask whether the person is genuinely operating independently. Do they control how the work is done? Can they send a substitute? Do they work for other clients? Are they taking financial risk? Are they providing a service rather than being managed as part of the internal team?
If the answer to those questions is no, the business should pause before relying on a self employed agreement.
Why Employers Should Review Contract Status Carefully
The working world has become more flexible, but employment law is increasingly focused on whether that flexibility is fair.
Zero hours arrangements are under greater scrutiny because of concerns about insecure work and unpredictable income. Self employed arrangements are under scrutiny because of concerns about people being denied rights they should receive.
For employers, this is not just about avoiding claims. It is about creating working arrangements that are clear, fair and sustainable.
A business should be able to explain why a zero hours contract is being used. It should be able to explain why someone is genuinely self employed. It should be able to show that the contract matches the reality.
If it cannot, the arrangement may need reviewing.
Zero hours contracts and self employed contracts both have a place, but they should not be used as shortcuts. The safest approach is to start with the reality of the working relationship, then choose the contract that fits.
If the business needs someone who is part of the team, managed closely and expected to work personally, that may point towards worker or employee status.
If the business needs a genuinely independent specialist to provide a service with control over how the work is delivered, a self employed contract may be appropriate.
The key is not what the contract is called. It is how the relationship works in practice. For employers, the message is simple. Be clear, be consistent and review flexible working arrangements before they become a problem.