Civil Law Act (Cap. 43): Primary legislation governing contract formation and enforcement in Singapore, based on English common law principles. Covers fundamental elements: offer, acceptance, consideration, intention to create legal relations, and capacity.

Moneylenders Act (Cap. 188): While private loans between friends are generally exempt, awareness is needed to avoid accidentally falling within regulated moneylending activities.

Interest Act (Cap. 149): Regulates interest rates. Even in friendly agreements, parties should avoid usurious rates that could be challenged in court.

Limitation Act (Cap. 163): Sets time limits for bringing legal action, generally 6 years for contractual claims.

Consumer Protection (Fair Trading) Act: While primarily for commercial transactions, its principles of fairness should be considered in private agreements.

Personal Data Protection Act 2012: Relevant if personal data is collected and stored as part of the agreement, ensuring proper handling of personal information.

Contract Formation Requirements: Agreement should be in writing, signed by both parties, witnessed if possible, with clear terms, specific payment schedule, and reasonable default provisions.