Second Jobs and Side Hustles: What Employers Need to Know

With the rising cost of living and the growth of flexible working, more employees are taking on second jobs or side hustles alongside their main employment. For most employers, this sits quietly in the background. But when it becomes a problem, it can be a significant one.

Working time breaches, conflicts of interest, confidential information at risk, performance affected by overwork. If your employment contracts don’t address secondary employment clearly, you’ll have limited options when any of these issues arise.

Key facts at a glance

  • Employees have no automatic legal obligation to disclose a second job unless your employment contract requires it.
  • The Working Time Regulations 1998 apply across all jobs combined. Employers can face liability even if excessive hours are caused by a second employer.
  • Blanket bans on second employment are rarely enforceable. Restrictions must be reasonable, proportionate and clearly drafted in the contract.
  • Performance issues linked to overwork or fatigue remain your responsibility to manage, regardless of whether a second job is the cause.
  • The Employment Rights Act 2025 introduces new rights for zero hours workers that may affect how employees with flexible arrangements use their time elsewhere.

Most employers never need to act on their secondary employment clauses. But having the right foundations in place means that when an issue does arise, you have clear options and aren’t navigating it on the back foot.

Can an employee have a second job?

In most cases, yes. Employees are generally free to work for more than one employer unless there is a clear contractual restriction in place. Any restriction must be reasonable and enforceable. Blanket bans, for example “you may not work for any other employer in any capacity”, are rarely appropriate and may not stand up to legal challenge.

The more proportionate approach is to focus your contract on protecting legitimate business interests: preventing work for direct competitors or clients, protecting confidential information and making sure secondary employment doesn’t affect performance or availability. That gives you a defensible position if issues arise, without overreaching in a way that creates its own risk.

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What your employment contract should say

If your contracts don’t address secondary employment at all, you’re working without a net. Standard provisions worth including are: a requirement to disclose other paid work (and in some cases seek permission); restrictions on working for competitors or clients of the business; confidentiality and intellectual property protections; and an expectation that other work won’t affect the employee’s performance, availability or obligations to you.

Confidentiality and intellectual property clauses deserve particular attention. An employee who also works for a competitor, or who is building their own business in the same space, creates real risk around proprietary information, client relationships and business data. Your contract should make clear what confidentiality obligations extend beyond employment hours and what constitutes a conflict of interest.

Working Time Regulations risks

This is where many employers underestimate their exposure. Under ACAS guidance on working hours, the 48-hour maximum working week under the Working Time Regulations applies to an employee’s total working time across all employers. If your employee is working 40 hours for you and 20 hours elsewhere, they may be in breach, and so might you if you were aware of it.

The practical protection is a signed 48-hour opt-out agreement, which employees can agree to voluntarily but can withdraw from with notice. Even with an opt-out in place, employees retain the right to minimum rest periods. If you don’t have opt-out agreements in place for employees in roles where long hours are common, it’s worth reviewing this.

When performance becomes an issue

If an employee’s performance or attendance is suffering and you suspect a second job is a contributing factor, your usual performance management process applies. The fact that a second job may be the cause doesn’t change your obligations or theirs. You’re not managing the second job. You’re managing the impact on their work for you.

Where you have a contractual requirement to disclose secondary employment and the employee hasn’t done so, that creates a disciplinary issue in its own right, depending on the nature of the work and any conflict it creates. Handle it through your normal disciplinary process, with proper investigation and a fair procedure.

The Employment Rights Act 2025 angle

The Employment Rights Act 2025 introduces new rights for workers on zero hours or low-guaranteed-hours contracts, including a right to be offered guaranteed hours that reflect their regular working pattern. This has a knock-on effect on secondary employment. Workers who currently rely on flexible arrangements across multiple employers may find their situation changes as these provisions come into force.

If your business uses zero hours or flexible contracts, review how the new rules affect your workforce and whether any of your current arrangements will need to change. Taking advice now is significantly easier than managing the consequences after the fact.

What you should do now

  • Review your employment contracts. Do they include clear secondary employment provisions covering disclosure, confidentiality and conflicts of interest?
  • Check whether you have 48-hour opt-out agreements in place for relevant employees.
  • Consider whether your current approach to conflicts of interest is clearly defined and communicated.
  • If you have zero hours or flexible workers, take advice on how the Employment Rights Act 2025 changes affect your arrangements.
  • If you’re aware of an employee working a second job and have concerns, don’t wait. Address it through your standard process before it becomes a bigger problem.

How Limelite can help

Whether you need your employment contracts reviewed and updated, advice on a specific situation involving a second job, or support building policies that protect your business, our team works with organisations across Worcestershire, Birmingham and the wider UK to get the people stuff right.

Find out more about our retained HR and consultancy services or our HR project support for one-off contract and policy reviews. Book a free 30-minute discovery call to talk it through.

Book a free 30-minute discovery call

About the author

Helen Scullion Assoc. CIPD, HR Client Manager at Limelite HR & Learning. Helen supports organisations with day-to-day HR management, employee relations and practical people support. Connect with Helen on LinkedIn.

FAQS

  • Can I stop an employee from having a second job?

    Not with a blanket ban — these are rarely enforceable and courts have found them disproportionate in many cases. You can, however, include reasonable restrictions that protect legitimate business interests. These typically cover working for direct competitors or clients, protecting confidential information and ensuring the second job doesn’t affect the employee’s performance or availability. Any restriction must be clearly drafted in the employment contract and proportionate to the risk.

  • Do Working Time Regulations apply across multiple jobs?

    Yes. The 48-hour maximum working week under the Working Time Regulations 1998 applies to an employee’s total working hours across all employers combined. If you’re aware that an employee is working excessive total hours, you may have liability even if the excess is caused by a second employer. The practical protection is a signed 48-hour opt-out agreement. Employees can withdraw from this with notice, but it provides a clear framework for managing the risk.

  • Does an employee have to tell me about a second job?

    Not automatically. There is no legal obligation to disclose secondary employment unless your employment contract specifically requires it. This is one of the most common gaps we see in SME contracts. Adding a clear disclosure requirement, alongside provisions on conflicts of interest and confidentiality, gives you the information and the contractual basis to act if an issue arises.

  • What should my employment contract say about second jobs?

    At a minimum, your contract should include a requirement to disclose other paid work (and seek permission in some cases), restrictions on working for competitors or clients, confidentiality and intellectual property protections, and an expectation that secondary employment will not affect performance or availability. If your contracts are silent on secondary employment, or if they haven’t been reviewed recently, it’s worth having them updated before a situation arises rather than after.

  • What if an employee's second job is affecting their performance?

    Your normal performance management process applies. You’re not managing the second job — you’re managing the impact on the employee’s work for you. If their performance or attendance is suffering, address it through your usual process. If they had a contractual obligation to disclose secondary employment and haven’t done so, that creates a separate disciplinary issue. Handle both through proper, documented procedures.

  • How does the Employment Rights Act 2025 affect employees with second jobs?

    The Employment Rights Act 2025 introduces new rights for workers on zero hours or low-guaranteed-hours contracts, including a right to be offered guaranteed hours reflecting their regular working pattern. This may affect employees who currently split their time flexibly across multiple employers. If your business uses zero hours or variable-hours arrangements, take advice on how the new rules apply to your workforce and what changes you may need to make.

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