Limitation Act 1959: Establishes time limits for bringing legal actions, particularly the 6-year limitation period for contractual debts. Critical for verifying if the debt claim is still within the enforceable timeframe.

Contract Law (Amendment) Act: Primary legislation governing contract formation and enforcement in Singapore. Essential for establishing the validity of the original debt agreement and its enforceability.

Money Lenders Act: Regulates licensed moneylenders, including provisions on interest rates and repayment terms. Applicable if the debt involves a licensed moneylending institution.

Banking Act: Governs banking institutions and their operations in Singapore. Relevant when the debt involves a banking institution and banking-related transactions.

Consumer Protection (Fair Trading) Act: Ensures fair trading practices in consumer transactions. Relevant for debts arising from consumer transactions and protecting consumer rights.

Rules of Court: Sets out procedural requirements for legal proceedings and pre-action protocols. Important for ensuring compliance with legal procedures if court action is contemplated.

Personal Data Protection Act 2012: Governs the collection, use, and disclosure of personal data. Ensures compliance with privacy requirements when handling personal information in demand letters.