Side hustles are becoming increasingly common in Singapore, both to earn extra income and diversify away from a salaried role. However, does your employer have the right to stop you from earning money outside your main job? The answer typically resides with your employment contract and what kind of side hustle you’re planning on doing. No Singapore statute flatly prohibits employees from having multiple income streams. The question is therefore decided by contract law, the implied duties that attach to employment relationships, and, in some cases, whether you are a civil servant or a foreign worker holding a specific pass type. So, here’s what you need to know if you’re trying to start a side hustle while holding a full-time job.
Side Hustle Vs. Moonlighting: Is There A Difference?
The two terms get used interchangeably, and that’s understandable, but they carry slightly different definitions. A side hustle typically refers to freelance, entrepreneurial, or gig work separate from your main career that usually doesn’t directly involve your employer’s industry or clients. Moonlighting traditionally refers to working for a second employer, often in a competing or adjacent field, sometimes in ways that create a conflict with your primary job.
The legal treatment is similar in both cases, but the risk level differs. A graphic designer who does freelance wedding illustrations in their evenings, for example, is a side hustler. But a marketing manager at a tech company who also works as a consultant for another tech firm is in significantly more legally sensitive territory, as that could be defined as “moonlighting”. This distinction matters when you are assessing the risk of what you are doing.
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Check Your Employment Contract
Before doing anything, though, go find your employment contract and read it carefully for the following four types of clauses.
First off, a secondary employment clause typically requires you to seek your employer’s written approval before taking on any other paid work. It may be phrased as a prohibition on working for any other employer, or it may say you need written consent before doing so. If your contract contains this clause and you take on a side hustle without approval, you are technically in breach of contract regardless of whether your side income involves your employer’s industry at all.
Second, a conflict-of-interest clause is broader and may cover situations where your external activities could affect your judgment, divide your loyalties, or disadvantage your employer, even without working for a direct competitor. This type of clause is more common in senior or client-facing roles where access to sensitive information is a factor.
Third, a non-compete clause restricts what you can do in competition with your employer’s business. Importantly, these clauses in Singapore employment contracts primarily apply during your employment and in the period after you leave. They do not always cover a side hustle that operates in a completely different field from your employer’s business, but if your side hustle involves the same industry, clients, or type of work as your main job, a non-compete clause is the one you need to take most seriously.
Fourth is a confidentiality clause that prohibits you from using or disclosing information you obtained in the course of your employment. This becomes relevant when a side hustle involves the kind of work where you might be tempted, even inadvertently, to apply knowledge, processes, or relationships that belong to your employer. Even if your contract does not have an explicit confidentiality clause, the duty of confidentiality is implied in most employment relationships as a matter of law.
Duty Of Fidelity: The Implied Rule Everyone Forgets
Even if your contract is silent on secondary employment, all employees in Singapore owe an implied duty of fidelity to their employer. This means you are expected to serve your employer diligently, honestly, and loyally throughout your employment. You are not supposed to place yourself in a position where your personal interests conflict with those of your employer, and you are not permitted to actively compete with your employer while simultaneously employed by them. This implied duty is what makes certain forms of moonlighting legally problematic even when there is no explicit contractual prohibition.
Are Non-Competes Actually Enforceable?
This is where many employees have a false sense of either security or alarm. Non-compete clauses in Singapore are not automatically enforceable just because you signed them. The courts apply a two-part test: first, the clause must protect a legitimate proprietary interest of the employer, such as trade secrets, client relationships, or confidential information. Second, it must be reasonable in scope, duration, and geographic coverage.
In 2024, the Ministry of Manpower (MOM) clarified its position in a parliamentary reply: non-competition clauses are generally unenforceable unless the employer can prove the clause protects a legitimate business interest and is reasonable in scope, geography, and duration. Singapore courts have struck down non-compete clauses in two notable 2024 High Court decisions. In both cases, the court found the clauses unenforceable because they were either overly broad or because separate confidentiality obligations already covered the interests they purported to protect.
In practice, non-compete clauses of three to six months are more likely to be upheld for senior employees with access to genuinely sensitive information or client relationships. Clauses covering junior employees, carrying no geographical limit, spanning several years, or preventing someone from working in an entire industry are much harder for employers to enforce and shouldn’t be blindly accepted. That said, the enforceability question is separate from the question of whether breaching the clause will cause you problems. Even an unenforceable non-compete can lead to disputes, legal costs, and reputational damage in your industry. Knowing the clause will likely fail in court is cold comfort if your employer applies for an injunction and you spend months in litigation.
Special Cases: Civil Servants And Foreign Employees
Civil servants in Singapore face additional restrictions beyond standard employment contracts. Government employees typically require explicit approval from their ministries before taking on any secondary employment, and some categories of work are prohibited outright. If you are a civil servant, the starting assumption should be that you need permission and that should be the default before considering taking on a side hustle. Meanwhile, foreign employees holding Work Permits or S Passes face a much more serious restriction. Under the Employment of Foreign Manpower (Work Passes) Regulations 2012, Work Permit and S Pass holders are legally prohibited from working for any employer other than the one specified in their pass. This is not a contractual question but a statutory one as a Work Permit or S Pass holder who moonlights commits an offence that can attract a fine and jail time.
Read Also: 7 Side Hustles That You Can Work From Home To Earn Additional Income
What To Do Before Starting A Side Hustle
The clearest path is to read your contract, understand what it requires, and, if it requires employer consent, seek it. Many employers are more receptive to this conversation than employees assume, particularly when the side hustle does not involve the employer’s industry or clients. Getting approval in writing helps you remove any possible ambiguity.
If your contract has no secondary employment clause, you are definitely in a better position, but you still need to ensure your side hustle does not violate your duty of fidelity, does not involve your employer’s clients or confidential information, and does not use work hours or company resources. That can be hard to guarantee outright, and these limits apply regardless of what the contract says. If you’re in any doubt about what your contract permits, particularly if you work in a client-facing or senior role with a non-compete clause, speaking to an employment lawyer before you start would be a smart first move.
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