Starting a side hustle alongside your day job is an increasingly popular way for UK workers to boost income, explore passions, or test business ideas. However, before you start invoicing clients or marketing your services, it’s crucial to understand how your existing employment contract may restrict or regulate your outside work. Many employees overlook the legal fine print that can have serious consequences, including disciplinary action or even court injunctions.
Why Your Employment Contract Matters for Side Hustles
Your employment contract is a legally binding agreement that sets out your rights and responsibilities as an employee. It often includes clauses designed to protect the employer’s business interests during and after your employment. Some of these clauses can impact your ability to start and run a side hustle, especially if it overlaps with your employer’s market or uses confidential information. Ignoring these clauses can lead to accusations of breach of contract, loss of trust, or worse.
Even if your side hustle is in a completely different sector, your contract might still contain broad restrictions on outside work or require disclosure. UK employment law balances protecting employers with employee freedom, but courts generally uphold reasonable restrictive covenants. That means you can’t simply ignore your contract and hope for the best.
See alsoStarting a side hustle while employed: the tax-bracket trap nobody mentions→Four Key Contract Clauses to Review Before Starting a Side Hustle
When reading your employment contract, focus on these four common clauses that could affect your side hustle plans:
- Non-compete clause
- Non-solicitation clause
- Confidentiality clause
- Conflict of interest clause
Non-Compete Clauses
A non-compete clause restricts you from working in a business that directly competes with your employer during or after your employment, often for a specified period and geographic area. For example, if you work for a marketing agency, your contract might prevent you from starting your own marketing consultancy or freelancing for competitors while employed. These clauses vary widely in scope and enforceability, but overly broad non-compete clauses can be challenged in UK courts if deemed unreasonable.
If your side hustle operates in the same industry or targets similar clients, a non-compete clause could block you from proceeding or require you to negotiate terms with your employer.
Non-Solicitation Clauses
Non-solicitation clauses prevent you from approaching your employer’s clients, customers, or employees to divert business or staff to your own venture. For example, if you work in recruitment, you may be barred from contacting candidates or clients you worked with to set up your own agency or consultancy. Unlike non-compete clauses, non-solicitation clauses tend to be more narrowly focused and enforceable.
Before you start, check whether your side hustle involves any interaction with your employer’s clients or colleagues that could trigger this clause.
Confidentiality Clauses
Confidentiality or non-disclosure agreements (NDAs) prohibit you from using or sharing your employer’s confidential information during or after your employment. This includes business strategies, client lists, pricing, or technical data. If your side hustle relies on any knowledge gained at work, you risk breaching this clause, which can lead to legal action.
For instance, a software developer starting a side project must ensure they don’t use proprietary code or internal tools from their day job. Always keep your side hustle separate and avoid any crossover that could breach confidentiality.
Conflict of Interest Clauses
Many contracts include broad conflict of interest clauses that require you to avoid any activities conflicting with your employer’s interests. This could mean disclosing any outside work and obtaining permission before starting. The employer’s concern is that your side hustle might distract you, use company time or resources, or damage their reputation.
If your contract has a conflict of interest clause, it’s best to be transparent and discuss your side hustle plans with your employer. Failure to disclose can be viewed as misconduct.
Practical Steps to Take Before Launching Your Side Hustle
Once you’ve reviewed your contract and identified any relevant clauses, follow these steps to protect yourself legally and professionally:
- Read your full employment contract carefully, not just the summary.
- Make notes on any clauses that mention restrictions on outside work or require disclosure.
- Research whether your side hustle overlaps with your employer’s business or clients.
- Prepare a clear explanation of your side hustle’s nature, hours, and clients.
- Consider discussing your plans with your line manager or HR department proactively.
- Request written consent from your employer if your contract or company policy requires it.
- Keep your side hustle activities separate from your day job—no company resources or time.
- Document all communications with your employer regarding your side hustle.
- If in doubt, seek advice from a UK employment solicitor to understand your rights.
Always get any permissions or agreements from your employer regarding your side hustle in writing. Verbal assurances are hard to prove if disputes arise. Written consent provides clear evidence that you disclosed your plans and had approval.
Real Examples of Employment Contract Clashes
Consider the case of Sarah, a graphic designer employed by a digital agency in London. Her contract contained a non-compete clause preventing her from working with any agency clients for six months post-employment. She started freelancing for a small business that happened to be a client of her employer without disclosure. When the agency found out, they issued a legal warning and threatened a court injunction to stop her work. The dispute cost Sarah time, money, and professional stress that could have been avoided by checking her contract and seeking permission.
Another example is James, a software developer whose contract required disclosure of any side business. He failed to tell his employer about his weekend app development side hustle. When his employer discovered the app was competing with one of their products, they accused him of conflict of interest and breached confidentiality. James faced disciplinary action and had to cease his side project.
Breach of contract due to undisclosed or conflicting side hustles can lead to warnings, suspension, or even dismissal. It can also damage your professional reputation and future job prospects. Always prioritise transparency and legal compliance.
What to Do If Your Contract Restricts Your Side Hustle
If your contract includes restrictive covenants that prevent you from starting your desired side hustle, here are some options:
- Negotiate with your employer for permission or to amend the clauses.
- Delay your side hustle until after your employment ends, respecting any post-termination restrictions.
- Choose a side hustle in a completely different sector or client base that doesn’t conflict with your contract.
- Seek professional legal advice to assess the enforceability of the clauses.
- Consider starting your side hustle as a hobby first to test waters without commercial invoicing.
Understanding that restrictive covenants must be reasonable in scope and duration is important. Courts in the UK will not enforce clauses that unfairly prevent you from earning a living. However, challenging such clauses can be costly and time-consuming, so early legal advice is key.
Final Thoughts from a UK Founder
"“When I started my side hustle while working full-time, I didn’t read my contract properly. It wasn’t until I received a formal letter from my employer that I realised I’d breached a non-solicitation clause. It was a stressful lesson, but it taught me the value of transparency and getting legal advice early. My advice? Don’t rush—know your contract inside out.” – Emma, founder of a London-based consultancy"
Starting a side hustle is exciting and rewarding, but it can’t come at the cost of your day job’s legal boundaries. By carefully reviewing your employment contract, understanding key restrictive clauses, and engaging openly with your employer, you can protect yourself and build your side business on a solid foundation. Always remember that UK employment law aims to balance employer protection with your right to work freely, but the key is knowing where your contract draws the line.