When Is It Legal To Ask Someone To Work For Free In The UK?

If you’re running a small business, it’s normal to need an extra pair of hands from time to time.

Maybe you’re launching something new, you want to “try before you hire”, or someone has offered to help you out for the experience.

But the moment the words “work for free” come up, you need to slow down and make sure you’re on safe legal ground. In the UK, unpaid work is tightly linked to National Minimum Wage (NMW) rules - and the risk isn’t just theoretical. HMRC can investigate, issue penalties, and require back pay.

Below, we’ll break down when it can be legal to ask someone to work for free in the UK, when it usually isn’t, and the practical steps you can take to protect your business from day one.

This guide is general information only and isn’t legal or tax advice. If you’re unsure whether someone counts as a “worker” for NMW purposes, it’s worth getting advice based on your exact setup.

What Does “Work For Free” Mean In A Business Context?

In everyday conversation, “work for free” could mean a lot of things - from a friend lending a hand for an hour, to an “intern” working 40 hours a week, to a candidate doing an unpaid trial shift.

Legally, what matters isn’t what you call the arrangement. It’s what’s actually happening in practice.

The Core Question: Are They A “Worker” For NMW Purposes?

In most problem cases, the legal issue is that the person is classed as a worker (or employee) - which means they’re entitled to be paid at least the National Minimum Wage/National Living Wage for the hours they work.

There isn’t one single “magic” test, but the risk goes up fast if the person:

• is doing productive work that benefits your business (not just observing),
• has set hours or a rota,
• has tasks and responsibilities like your paid staff,
• is under your direction/supervision,
• is expected to attend and perform (not truly optional).

Even if they agree to do unpaid work, that doesn’t necessarily remove their right to be paid. NMW rights can’t usually be signed away.

Why Small Businesses Get Caught Out

Most small businesses aren’t trying to do the wrong thing. The issues often start with good intentions:

• “They asked for experience.”
• “It’s just a trial shift.”
• “It’s only a few days.”
• “We’ll pay them later if it works out.”

Unfortunately, if the person is effectively working for you, those explanations won’t necessarily protect you if the arrangement breaches NMW rules.

When Is It Legal To Ask Someone To Work For Free In The UK?

There are circumstances where it can be legal for someone to work for free - but they’re more limited than many business owners expect.

As a general rule: if someone is providing work or services to your business and they look like a “worker”, you should assume they need to be paid unless a clear exemption applies.

1. Volunteers And “Voluntary Workers” (Usually In Charities/Not-For-Profits)

Unpaid volunteering is most commonly associated with charities, not-for-profits, and community organisations.

In the NMW rules, there’s an important difference between:

• volunteers (who generally shouldn’t be required to work or have contractual obligations), and
• voluntary workers (a specific category that can apply in certain charity/voluntary organisation contexts, provided the legal conditions are met).

For a standard for-profit business, “volunteer” arrangements are often high risk because if the person is doing real work under your direction (especially with set hours and responsibilities), they may still be treated as a worker and entitled to NMW.

If you do operate in the not-for-profit space (or have a charitable arm), it’s still important to set expectations clearly and keep the relationship genuinely voluntary. A properly drafted Volunteer Agreement can help outline boundaries (for example, that there’s no obligation to attend and no payment).

2. Work Shadowing (Observation Only)

Work shadowing can be one of the safest ways to give someone exposure to your business without turning it into unpaid labour.

To keep it “shadowing” (and not “work for free”), aim for:

• short durations (hours, not weeks),
• no productive output (they’re watching, not doing),
• no responsibility for customers, stock, tools, sales, admin, or deliveries,
• clear supervision.

If they start “helping out” in a way that benefits the business, you’re moving towards a worker relationship - and payment may be required.

3. Certain Types Of Work Experience Placements

Some work experience placements can be lawful without pay, but it depends heavily on who the person is and what the placement looks like.

For example, there are specific NMW exemptions that can apply to certain students doing a placement as a required part of a UK further or higher education course (and these can run up to a year). Separately, short, structured placements that are genuinely educational and not replacing paid staff are generally lower risk than arrangements that look like a job with free labour attached.

Where you do offer placements, it’s smart to document the arrangement upfront with a Work Experience Agreement so everyone understands it’s a learning placement, not employment.

4. Limited “Work Trials” (With Care)

Work trials are one of the most common places businesses accidentally break the law.

A short trial can be legitimate where it is genuinely to assess skills and suitability - but if the individual is providing value to your business (serving customers, producing output, working a full shift), they may well be entitled to pay.

If you’re considering this approach, it’s worth reading up on the practical risk areas around trial shifts and building a process that stays within safe limits.

5. People Who Aren’t “Workers” (Rare In Practice)

Sometimes, someone genuinely isn’t a worker - for example, where there is no obligation on either side and no expectation of tasks being completed.

However, if you’re a business owner relying on their time and output, it’s usually safer to assume they are a worker unless you’ve had advice confirming otherwise.

When Is Asking Someone To “Work For Free” Usually Not Legal?

There are scenarios where unpaid work is commonly offered, but legally risky.

If any of these sound like your plan, it’s a strong sign you should pay at least NMW (and put proper paperwork in place).

Unpaid Internships That Look Like A Job

If your “intern” is doing real work for the business - managing inboxes, creating content, doing admin, handling customers, processing orders - they’re likely a worker.

Calling it an internship doesn’t automatically make it unpaid.

If you do engage interns, documenting the relationship properly is important - but remember, paperwork won’t override reality. If they’re a worker, they must be paid. If you want the arrangement to be truly structured and fair, an Internship Agreement can help set out duties, supervision, confidentiality, IP, and boundaries.

“Trial Weeks” Or Multiple Full Shifts Unpaid

A common mistake is asking someone to do several shifts “to see if it works out”.

The longer the trial goes on, and the more it resembles normal work, the harder it is to justify as unpaid. In most cases, if you need someone for multiple shifts, you need to pay them.

Using Unpaid People To Cover Staff Shortages

If you’re short-staffed and someone is stepping in to keep the business running, that’s a red flag. It suggests they’re doing productive work that you’d otherwise pay someone to do.

Unpaid “Freelancer” Tests That Produce Real Deliverables

In creative industries (marketing, design, web development), it’s common to request a “test piece”.

If the test is used in your business (published content, a logo you adopt, website code you deploy), you’re receiving value - which can create disputes about payment and ownership.

If you’re engaging someone as an independent contractor, have the right contract terms in place from the outset, including IP ownership and deliverables. A Contractor Agreement can be a strong starting point.

Common High-Risk Scenarios (And Safer Alternatives)

Here are some real-world situations where small businesses often try to have someone work for free - and how to do it more safely.

1. “Can You Just Help Out For A Day?”

Risk: If the person is helping with operations (serving customers, packing orders, cleaning, admin), it’s likely work.

Safer alternative: If you genuinely need the help, pay them for the day. If it’s a friend/family member offering casual help, keep it genuinely ad hoc, short, and not part of normal staffing.

2. Unpaid Trial Shift In Hospitality Or Retail

Risk: If they’re on the floor dealing with customers, you’re receiving the benefit of their labour.

Safer alternative: Keep trials short and skills-based (for example, a short observed task), or pay for the trial hours at NMW. If you do run a trial, keep written notes on what was assessed and why it was necessary.

3. Student Placement/In-Store Experience

Risk: The placement can drift into “free staff member”, especially if the student is given regular shifts.

Safer alternative: Make the placement structured, time-limited, and educational. Rotate observation, training, and supervised tasks. Use a written agreement to make the learning objectives clear.

4. “Unpaid Internship With The Promise Of A Job Later”

Risk: Promising future benefits can make it feel even more like employment. And if the job doesn’t materialise, you may face complaints and reputational damage as well as legal risk.

Safer alternative: If you need ongoing help, hire someone properly (even part-time) and put an Employment Contract in place that matches the role.

How To Ask Someone To Work For Free Safely (Practical Checklist)

If you’re considering any unpaid arrangement, treat it like a risk-management exercise. A bit of structure now can save you a lot of stress later.

Step 1: Decide What You’re Actually Trying To Achieve

Start with the business goal. For example:

• Do you want to assess skills before hiring?
• Do you want to give a student exposure to the industry?
• Do you need short-term help during a busy period?

If the answer is “we need help to get work done”, paying NMW is usually the safest path.

Step 2: Assess The NMW Risk Factors

Ask yourself honestly:

• Would this work normally be done by paid staff?
• Will the person be supervised like staff?
• Are there set hours or a rota?
• Will the business benefit from their output?

The more “yes” answers you have, the more likely it is they should be paid.

Step 3: Keep Unpaid Arrangements Short, Supervised, And Non-Productive

If you’re relying on an exemption (like shadowing or a short work trial), the safest characteristics are:

• short duration (hours, not days/weeks),
• clear supervision (they’re being assessed or trained),
• limited output (you’re not “getting work done” through them),
• no obligation (they can leave, and you can end it at any time).

Step 4: Don’t Forget Other Legal Duties Still Apply

Even if it’s lawful for someone to work for free, you can still have legal obligations, including:

• health and safety duties (Health and Safety at Work etc. Act 1974) - provide a safe environment, training, and supervision,
• working time considerations (Working Time Regulations 1998) if the placement resembles work,
• anti-discrimination duties (Equality Act 2010) - recruitment and placement decisions should be fair and non-discriminatory,
• data protection if they access personal data (UK GDPR and Data Protection Act 2018) - limit access and set clear rules.

In other words, “unpaid” doesn’t mean “unregulated”.

Step 5: Document The Arrangement Clearly

This is where many businesses fall down. If it isn’t written down, expectations drift, and disputes become more likely.

You don’t always need a long contract, but you should have something in writing confirming:

• what the person will do (and won’t do),
• how long it will last,
• whether it’s paid or unpaid (and why),
• confidentiality and handling of business information,
• ownership of work product/IP (if relevant),
• health and safety/supervision arrangements.

What Legal Documents Help Protect Your Business?

The right documents won’t magically make unpaid work lawful, but they do help you set clear boundaries, reduce misunderstandings, and protect your business if a relationship goes sideways.

Work Experience Or Internship Paperwork

If you’re offering structured experience, the documentation should match what’s really happening day-to-day.

• If it’s a genuine placement, a Work Experience Agreement can set the scope and supervision expectations.
• If you’re engaging an intern (especially where tasks, confidentiality, or IP are involved), an Internship Agreement can help clarify duties and boundaries.

Employment Contracts For Paid Roles

If the person is doing real work, a paid arrangement is usually the cleanest option - and it can still be flexible (for example, casual hours, short fixed term, or part-time).

Having an Employment Contract helps protect you on pay, duties, confidentiality, notice, and what happens if the relationship doesn’t work out.

Contractor Agreements For Freelancers

If you’re bringing in a freelancer (for example, a designer, marketer, developer, or consultant), you’ll want a written agreement that covers:

• deliverables and milestones,
• fees (including what happens if the project ends early),
• IP ownership and licence rights,
• confidentiality,
• liability and dispute handling.

A Contractor Agreement is often the key document here.

Policies And Practical Controls

Even short-term unpaid placements can expose you to risk if someone has access to customers, systems, or confidential information.

Depending on your business, consider simple controls like:

• restricted system access,
• clear confidentiality instructions,
• supervised handling of customer data,
• written rules on acceptable use of devices and accounts.

If you’re unsure what you need, it’s worth getting advice - particularly where your business deals with vulnerable customers, sensitive data, or regulated services.

Key Takeaways

• In the UK, asking someone to work for free is only lawful in limited situations - and the label you use (intern, volunteer, trial) won’t override the legal reality.
• If the person is doing productive work for your business under your direction, they’re likely a worker and entitled to at least National Minimum Wage.
• Unpaid arrangements are generally safest when they are short, supervised, and educational (for example, genuine shadowing or a structured placement, or certain student placements that fall within a specific NMW exemption).
• Trial shifts and unpaid internships are common risk areas - if you’re getting value from their labour, paying them is usually the safest option.
• Put the arrangement in writing and use the right documents (such as a Work Experience Agreement, Internship Agreement, Employment Contract, or Contractor Agreement) to set boundaries and protect your business.
• If you’re unsure, get advice early - fixing it after a complaint or HMRC investigation is much harder (and more expensive).

If you’d like help putting the right structure and documents in place so you can bring people in confidently (without unintentionally breaching pay rules), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.