Employment Act (Chapter 91): Primary legislation governing employment relationships in Singapore. Relevant for ensuring the thank you letter aligns with proper employment termination procedures and maintains professional standards.

Personal Data Protection Act (PDPA): Singapore's data protection law that governs the collection, use, and disclosure of personal data. Ensures the thank you letter doesn't inappropriately disclose confidential information or personal data.

Non-Disclosure Agreements (NDAs): Any existing confidentiality agreements between employee and employer that must be respected in the content of the thank you letter.

Competition Act: Relevant for cases where non-compete clauses exist, affecting how future employment plans can be mentioned in the thank you letter.

Notice Period Requirements: Professional consideration regarding compliance with contractual notice period obligations when writing the thank you letter.

Company Exit Policies: Internal company policies and procedures that govern the employee exit process and should be reflected in the professional tone of the letter.

Handover Protocols: Professional consideration regarding the proper documentation and transfer of responsibilities, which may need to be acknowledged in the thank you letter.

Professional Etiquette Standards: Best practices for maintaining professional relationships and ensuring the letter supports future reference potential while maintaining appropriate business courtesy.