Employment Contract Requirements in Singapore: What Makes an Agreement Valid

Last reviewed: 13 September 2026

What Makes an Employment Contract Valid

An employment contract in Singapore doesn’t need to be written to be legally binding — a verbal agreement on the core terms is enforceable the same way a signed document is. What matters is that both sides agreed: an offer was made, accepted, and something of value (a job, in exchange for pay) changes hands. In practice, relying on a verbal agreement alone is a bad idea for both sides — it’s much harder to prove what was actually agreed if a dispute comes up later, which is exactly the gap the Employment Act’s written Key Employment Terms requirement exists to close.

When a Contract Takes Effect

A contract of service comes into effect when the new recruit actually turns up for work on the agreed starting date — not on the date it was signed, and not on the date an offer letter went out. Confirmation of an employee, such as passing probation, isn’t itself covered by the Employment Act — it depends entirely on what the contract says. One detail worth getting right in payroll and leave calculations: an employee’s length of service is counted from the date they started work, not the date they were confirmed.

Employment Contract vs Key Employment Terms

It’s easy to conflate these two, but they’re not the same thing. The employment contract is the full agreement between employer and employee, covering everything both sides negotiated. Key Employment Terms (KETs) are a legally mandated subset of that agreement — a checklist MOM requires employers to issue in writing within 14 days of the start date, for employees covered by the Employment Act who are engaged for 14 days or more. A written contract that covers every applicable KETs item satisfies both obligations at once; an employer can also issue KETs separately — in an offer letter, employee handbook, or standalone document — without a single formal contract document, as long as everything required is covered somewhere the employee can access and keep.

If a New Hire Doesn’t Show Up

If a recruit signs an offer but never turns up on their starting date, the Employment Claims Act doesn’t apply — because the employee never started work, MOM’s own guidance is explicit that there’s no notice pay or compensation claim available under that Act. An employer’s only recourse for a genuine loss is a civil claim in the ordinary courts, not MOM’s tribunal system. The same principle cuts the other way too: an employer can’t be pursued through the Employment Claims Tribunal for a job offer that never actually started either.

Changing Contract Terms After Signing

An employer cannot change a signed contract’s terms and conditions without the employee’s consent, full stop. MOM’s own guidance says that if terms need to change — salary, working hours, or anything else — both sides should negotiate and try to reach an agreement that accounts for business needs and the employee’s concerns, then sign a new contract with the new terms clearly stated. If no agreement is reached, either side can serve notice and end the employment relationship, rather than the employer simply imposing the change unilaterally.

Non-Compete and Other Restrictive Clauses

Restraint of trade clauses — non-competes, non-solicitation, confidentiality clauses that outlast employment — sit outside the Employment Act entirely. Their enforceability is a matter for the Courts, decided case by case. Per a 29 February 2024 parliamentary reply, Singapore’s courts will only enforce a restraint of trade clause where the employer has a legitimate business interest to protect, and the clause is reasonable in scope, geographical area, and duration — it can’t simply be used to block competition or lock in an unfair advantage.

Employees who believe they’ve been asked to sign an unreasonable clause can raise it with their union, TAFEP, or MOM directly. As of that reply, complaint volumes on this specific issue had stayed low, though the tripartite partners were working on guidelines to give employers clearer norms, particularly for roles where a restrictive clause has an outsized impact on someone’s ability to find their next job.

Contract of Service vs Contract for Service

Getting this distinction right at the drafting stage avoids a much bigger headache later. A contract of service creates an employer-employee relationship, covered by the Employment Act and everything that comes with it — CPF, leave, itemised pay slips, KETs. A contract for service engages an independent contractor or vendor for a fee to deliver a specific piece of work, and none of the Employment Act’s protections apply. Calling someone a ‘contractor’ in the paperwork doesn’t settle the question if the actual working relationship looks like employment in substance.

Compliant vs Non-Compliant

✅ Compliant	❌ Non-Compliant
Core terms agreed and, ideally, put in writing before day one	Relying on a vague verbal understanding with nothing documented
KETs issued in writing within 14 days, even without a full formal contract	No KETs issued at all, or issued well past the 14-day mark
Contract changes negotiated and signed as a new agreement	Salary or hours changed unilaterally with a notice, not a negotiation
Restrictive clauses scoped narrowly to a real business interest	A blanket non-compete covering any competitor, anywhere, for years
New-hire no-shows handled as a civil matter, not an Employment Claims Tribunal claim	Assuming MOM’s tribunal can recover losses from a no-show hire

Employer Checklist

• Core terms are agreed and documented before the employee’s first day, not after
• KETs are issued in writing within 14 days, whether or not a full contract exists
• Any change to an existing contract goes through negotiation and a signed update, never a unilateral notice
• Non-compete or restrictive clauses are scoped to a real business interest, with reasonable time, geography, and role limits
• Contractor agreements are checked against the actual working relationship, not just the label on the paperwork

Not sure how leave terms should be documented in a compliant contract? Our Leave Entitlement Guide can help you work out which questions to ask.

Last verified: 13 September 2026

Related tool: once you’ve reviewed this guide, use the SME Employee Onboarding Checklist Builder to turn it into a role-specific first-day, first-week and first-90-days checklist.