Singapore is a pure common-law restraint-of-trade jurisdiction. There is no non-compete statute and no fixed numeric ceiling; instead, every post-employment covenant is presumptively void and unenforceable unless the employer earns its enforcement. The controlling authority is Man Financial (S) Pte Ltd v Wong Bark Chuan David [2008] 1 SLR(R) 663, where the Court of Appeal adopted Lord Macnaghten's classic statement in Nordenfelt that all restraints of trade are contrary to public policy and void unless justified. The test is cumulative and works in stages. First, the employer must identify a legitimate proprietary interest, recognised categories being trade secrets and confidential information, the employer's trade connection with its customers, and the maintenance of a stable, trained workforce. Second, the restraint must be reasonable as between the parties, meaning no wider than necessary in its scope of activity, geography and duration. Third, it must be reasonable in the interests of the public.
A trap deserves emphasis. Where confidential information is already protected by a separate confidentiality clause, the employer must show the non-compete guards a legitimate interest over and above that information, or the court will treat it as a bare attempt to stifle competition and strike it down. That rule, drawn from Stratech and confirmed in Man Financial, sank the employer in Shopee Singapore Pte Ltd v Lim Teck Yong [2024] SGHC 29. In MoneySmart Singapore Pte Ltd v Artem Musienko [2024] SGHC 94 the court also condemned cascading drafting, where several possible restraint periods are stacked, leaving the employee unsure which one binds. The reasonableness of a covenant is judged at the date the contract is made, not when it is enforced. For the doctrine in the round, the practitioner's note on Singapore restraint-of-trade reasonableness at the OpenAgreements Singapore non-compete practice guide sets out the three-limb structure clearly.