Can Employees Be Sole Traders In The UK?

It’s increasingly common for people to hold down a day job and run a side business as a sole trader. As an employer, that can raise understandable questions: is it legal? What are your risks? And how do you set fair, compliant rules without killing entrepreneurial spirit?

Good news - in the UK, being employed and self‑employed at the same time is allowed. The key is managing conflicts, status and tax risks, confidentiality, working time and health and safety obligations in a sensible, legally robust way.

This guide breaks down what employers need to know, the policies and contract clauses to put in place, and practical steps to keep your business protected while supporting staff who have legitimate side ventures.

Can You Be Employed And A Sole Trader? The Short Answer For Employers

Yes. There’s nothing in UK law that stops an employee from also trading as a sole trader outside their working hours. HMRC recognises that individuals can be self‑employed for one engagement and an employee for another. They’ll pay income tax via PAYE on their employment and file a Self Assessment for their sole trader profits (with Class 2/4 National Insurance where applicable).

However, “allowed” isn’t the same as “risk‑free.” As the employer, you remain responsible for:

• Protecting confidential information and intellectual property.
• Avoiding conflicts of interest and competition with your business.
• Ensuring working time and rest breaks are respected for health and safety.
• Preventing misuse of your systems, tools and brand.
• Managing reputational risk and client poaching.

Handled well, you can have clear, fair boundaries that let employees side‑hustle without undermining your business. Handled poorly, you could face data leaks, burnout issues, or even a tribunal dispute about restrictive covenants.

Key Legal Risks For Employers When Staff Have Side Businesses

Confidential Information And IP

Your trade secrets, pricing, strategy and client lists are valuable assets. Without strong confidentiality obligations and practical controls, side businesses can lead to accidental leaks or deliberate misuse.

Make sure your Employment Contract includes clear confidentiality clauses, IP ownership terms for works created in the course of employment, and obligations to return company property on request. If an issue crops up, have a plan to investigate and act - this is easier if you already have a written policy on handling confidentiality breaches at work.

Conflicts Of Interest And Competition

A conflict of interest arises if an employee’s sole trader work overlaps with your business or your clients. This could include competing services, diverting opportunities, or using insider information to gain advantage.

Put a straightforward disclosure and consent process in place. A practical (and fair) approach is to require written disclosure of any secondary work and your approval before it starts. A well‑drafted Conflict of Interest Policy and consistent enforcement make a big difference.

Restrictive Covenants And Poaching

Post‑employment restrictions (like non‑compete and non‑solicitation clauses) can help protect your goodwill, if they’re reasonable in scope, duration and geography. Be careful: covenants that are too broad can be unenforceable. Make sure any restrictions are tailored to the role and legitimate business interests, in line with best practice for non‑compete clauses.

Working Time, Fatigue And Health & Safety

Under the Working Time Regulations 1998, most workers shouldn’t exceed an average of 48 hours per week (across all jobs) unless they’ve opted out, and they’re entitled to daily and weekly rest periods. If a team member is working long hours in their side business, fatigue can become a safety risk - for them, colleagues and customers.

Set expectations about outside work hours, request reasonable disclosure of other working hours, and keep an eye on rotas if the employee has signed a 48‑hour opt‑out. Our guide to the Working Time Regulations has a helpful overview.

Use Of Company Time, Tools And Brand

Your equipment, paid time, email and branding shouldn’t be used to run a personal business. Spell this out, and enforce it consistently. It’s sensible to include examples: no sending side business emails from work accounts, no using licensed software or customer data for personal projects, and no implying your company endorses the side venture.

Reputation And Social Media

Even if activities occur outside work, the public may still associate the individual with your brand. Have a clear social media and communications policy setting boundaries on endorsements, press interviews, and posts that could drag your business into controversy.

Hiring Someone Who Is Also Self‑Employed: Status, Tax And IR35

You might be hiring an employee who runs a sole trader venture separately, or engaging that person’s sole trader business to supply services to you. These scenarios carry different obligations - getting the status wrong is one of the biggest risks for UK employers.

Employment Status Still Depends On The Specific Engagement

HMRC and tribunals look at the reality of the working relationship - control, personal service, mutuality of obligation, financial risk and more. A person can be an employee in one role and a genuine contractor in another. Use the familiar tests when assessing arrangements; our primer on employment status tests is a good starting point.

• If you’re hiring them as an employee, you’ll run PAYE and apply employment rights.
• If you’re engaging their sole trader business, you’ll need a robust Contractor Agreement or Consulting Agreement, and you must avoid treating them like an employee in practice.

IR35/Off‑Payroll Working Rules

IR35 primarily targets intermediaries like personal service companies, but the status questions it raises are relevant to any contractor engagement. Medium and large businesses have end‑client duties under the off‑payroll rules for PSCs; small companies don’t - but all businesses should still assess employment status carefully to avoid PAYE/NIC liabilities and tribunal claims.

Tax And Reporting

Where someone is genuinely self‑employed, you ordinarily pay their invoices gross (subject to VAT if registered) and they handle their own income tax and NIC via Self Assessment. If they are actually a worker/employee in law, HMRC can pursue you for unpaid PAYE, NIC, interest and penalties. Document your assessment, keep the scope truly project‑based, and don’t blur the lines with employee‑style control.

Policies And Contract Clauses To Put In Place

Most problems are preventable with clear expectations from day one. A practical “side work” framework usually includes the following.

Employment Contract Foundations

Ensure your Employment Contract covers:

• Obligation to disclose secondary employment or self‑employment and obtain consent (not to be unreasonably withheld).
• Confidentiality and IP assignment for work created in employment.
• Reasonable post‑employment restrictions (targeted non‑compete, non‑solicitation and non‑dealing where appropriate).
• Clear rules on use of working time, equipment, systems and branding.
• Compliance with working time and health and safety requirements, including disclosure of other working hours if requested for safety reasons.

Staff Policies That Do The Heavy Lifting

Back up your contracts with a concise set of policies - either as a Staff Handbook or standalone rules. These commonly include:

• Conflict of interest and outside work permission process.
• Confidentiality, data security and acceptable use of IT.
• Social media and communications.
• Working time, overtime/opt‑out and fatigue management.
• Gifts/hospitality and anti‑bribery.

Keep policies short, practical and consistently enforced. If you don’t have a handbook yet, start with a core Workplace Policy covering conflicts, confidentiality and acceptable use.

Contractor Documents (If You Engage Their Sole Trader Business)

If you buy services from an employee’s separate sole trader venture - or from any independent contractor - put strong commercial terms in place. At a minimum, you’ll want scope and deliverables, service levels, fees and expenses, termination, liability and insurance, confidentiality, data protection, and IP ownership. Where the contractor will create IP for you, build in an assignment so you own it; our guide to IP and independent contractors explains why this is critical.

Make sure the actual working practices reflect contractor status - avoid employee‑style control, set project‑based outcomes, and allow genuine substitution where feasible.

If You’re Employed And Also Running Your Own Sole Trader Venture

Plenty of founders keep a part‑time or full‑time job while validating their business idea. If you’re a business owner who’s also employed, the same principles apply - but you’ll see them from both sides.

Check Your Contract Before You Launch

Look for any exclusivity, conflict, IP and confidentiality clauses. Many employers allow side businesses with prior written consent. If there’s a blanket ban, you may be able to negotiate reasonable permission (for example, no overlap with customers, no use of work time or tools, and a scope that doesn’t compete).

Keep IP And Data Cleanly Separated

Build your product, brand and materials using your own equipment and software, outside work hours. Don’t use employer code, templates, photos, lists or confidential know‑how. If you’re also a company director, be aware of your fiduciary duties - see our explainer on the dual role of director or employee.

Mind Your Hours And Health

Track your total weekly hours and respect rest periods. If you’ve signed an opt‑out, keep it under review. If your employer raises fatigue concerns, work together to adjust schedules.

Get Your Own Legals In Place

Even as a sole trader, you’ll need customer terms, privacy and data protection compliance, and contracts with any freelancers you hire. If you collect personal data, publish a clear Privacy Policy and comply with UK GDPR and the Data Protection Act 2018. If you handle calls or recordings, review practical rules around GDPR and business calls.

Practical Scenarios And How To Handle Them

Scenario 1: A Team Member Wants To Start A Side Business

What to do:

• Ask for a short written disclosure: description of the venture, expected weekly hours, any overlap with your customers or suppliers, and any potential conflicts.
• Run a quick risk assessment: confidentiality, competition, working time, reputational risks, and whether restrictions apply.
• Give conditional consent in writing (if appropriate): set boundaries on client overlap, hours, use of equipment, and social media.
• Record the agreement, diarise a review in 3–6 months, and update rotas if hours are tight.

Scenario 2: You Want To Engage An Employee’s Separate Sole Trader Business

What to do:

• Assess status carefully using the employment status tests. Keep their employment and contractor roles clearly separated.
• Put a separate Contractor Agreement or Consulting Agreement in place, with precise scope, deliverables and IP assignment.
• Confirm that the contractor role doesn’t undermine your conflict of interest rules or any existing post‑employment restrictions.
• Ensure payment, insurance and liability are appropriately allocated, and that the engagement remains genuinely independent in practice.

Scenario 3: You Suspect A Conflict Or Confidentiality Breach

What to do:

• Refer to your policies and contract; gather facts promptly and fairly.
• Consider a proportionate response - from clarifying consent conditions, to removing access, to formal disciplinary steps.
• Protect evidence, retrieve devices or data where permitted, and review access permissions going forward.
• If the employee leaves, rely on well‑drafted, reasonable restrictive covenants and confidentiality obligations to protect your position.

Key Takeaways

• In the UK, someone can be employed and a sole trader at the same time - the law allows it, but as an employer you must manage conflicts, confidentiality, working time and reputational risks.
• Tighten your documents: your Employment Contract should include disclosure and consent for outside work, clear confidentiality and IP terms, and carefully scoped post‑employment restrictions.
• Back contracts with practical policies: use a Staff Handbook or core Workplace Policy covering conflicts of interest, acceptable use of IT, social media, and working time obligations.
• If you engage an employee’s separate sole trader venture, treat it like any third‑party contractor: use a proper Contractor Agreement or Consulting Agreement, assess status carefully and secure IP ownership.
• Watch working time and safety: comply with the Working Time Regulations, manage fatigue risks and require disclosure of secondary hours where needed.
• Keep data and IP safe: set firm rules against using company data, tools or brand for side businesses, and have a clear plan to handle confidentiality breaches if they arise.
• When in doubt, get tailored advice: employment status and restrictive covenants are fact‑sensitive - a short chat with a lawyer can prevent costly status disputes and unenforceable clauses later.

If you’d like help drafting contracts or policies to manage staff side businesses - or you want advice on status, conflicts or IP - you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no‑obligations chat.