Contracts Act (Cap. 53): Primary legislation governing contract formation, validity, parties' rights and obligations, and remedies for breach in Singapore. Essential for establishing the fundamental framework of the business relationship.

Companies Act (Cap. 50): Regulates corporate capacity, authority, business registration requirements, and corporate governance compliance. Ensures parties have proper legal standing to enter into the agreement.

Competition Act (Cap. 50B): Addresses anti-competitive practices, fair trading provisions, and market dominance considerations. Ensures the business relationship complies with competition law requirements.

Personal Data Protection Act 2012 (PDPA): Governs data collection, usage, cross-border transfer, and protection obligations. Critical for any business relationship involving personal data handling.

Electronic Transactions Act: Regulates electronic contracts, signatures, and digital communications. Relevant for modern business relationships conducted electronically.

Unfair Contract Terms Act: Sets limitations on exclusion clauses and establishes reasonableness tests for contract terms. Ensures fairness in contractual relationships.

Sales of Goods Act: Governs transactions involving the sale of goods. Applicable if the business relationship involves the transfer of goods.

Consumer Protection (Fair Trading) Act: Protects consumer interests in business transactions. Relevant if the business relationship involves dealing with consumers.

Common Law Principles: Incorporates precedent cases, principles of equity and fairness, and the doctrine of privity of contract in Singapore's legal system.

International Trade Laws: Governs cross-border transactions, foreign investment rules, and international business relationships when applicable.