Employment Act (Chapter 91): Primary employment legislation in Singapore that defines employment relationships. Important for clearly distinguishing self-employed status from regular employment, as SEPs are not covered under this Act.

Tripartite Guidelines on Self-Employed Persons: Guidelines jointly issued by Ministry of Manpower (MOM), NTUC, and SNEF that provide framework for SEP classification, rights, and responsibilities in Singapore.

Central Provident Fund Act: Legislation governing Singapore's social security system. Crucial for distinguishing SEP status as self-employed persons handle their own CPF contributions unlike regular employees.

Income Tax Act: Tax legislation relevant to SEPs who are responsible for their own tax declarations and payments to IRAS, unlike regular employees who have tax automatically deducted.

Personal Data Protection Act 2012 (PDPA): Legislation governing the collection, use, and disclosure of personal data. Relevant for handling personal information in the verification letter.

Contracts Act (Chapter 2): Basic contract law framework in Singapore that ensures legal validity and enforceability of the verification letter and underlying business relationship.

Competition Act: Legislation relevant for independent contractors to ensure compliance with fair competition practices and prevent anti-competitive arrangements.