Limitation Act 1959: Sets the time limits within which legal action for debt collection must be initiated. Must verify the debt claim is within statute of limitations before issuing demand letter.

Contract Law (Amendment) Act: Governs the fundamental aspects of contractual relationships and enforcement of contractual obligations in Singapore.

Banking Act: Relevant when dealing with debts involving banking or financial institutions, setting out regulatory framework for banking business.

Civil Law Act (Cap. 43): Provides framework for contract enforceability and regulated interest rates that can be claimed in the demand letter.

Consumer Protection (Fair Trading) Act: Ensures collection practices are fair and not misleading to debtors, protecting consumer rights in debt collection.

Personal Data Protection Act 2012: Governs the collection, use, and disclosure of personal data in the demand letter and collection process.

Moneylenders Act: Applicable when debt involves licensed moneylenders, setting out specific requirements for debt collection practices.

Rules of Court: Procedural rules relevant if legal action is contemplated following the final demand letter.

Collection Guidelines by Credit Collection Association of Singapore: Industry guidelines setting professional standards for debt collection practices in Singapore.

MAS Guidelines: Monetary Authority of Singapore guidelines applicable when dealing with regulated financial institutions.

Anti-Harassment Requirements: Legal requirement to avoid any threatening, harassing, or intimidating language in the demand letter.

Mandatory Content Requirements: Essential elements that must be included: payment details, accurate debt amount, reasonable payment deadline, and consequences of non-payment.