Employment Act (Chapter 91): Primary legislation governing employment in Singapore, particularly Part IV which covers working hours, overtime, and rest days. Applies to employees earning up to S$2,600 basic monthly salary. Sets fundamental overtime regulations and worker protections.

Employment (Overtime Pay) Regulations: Specific regulations detailing overtime payment calculations and requirements. Mandates minimum overtime rate of 1.5 times the basic hourly rate and provides calculation methods for different scenarios.

Protection from Harassment Act: Legislation to prevent workplace harassment, which must be considered to ensure overtime authorization processes don't enable or result in workplace harassment through excessive overtime requests.

Personal Data Protection Act (PDPA): Data protection legislation governing the collection, use, and disclosure of personal data. Relevant as overtime forms contain personal employee information that must be properly handled and protected.

Maximum Overtime Limit: Regulatory limit of 72 hours of overtime per month per employee that must be strictly observed in any overtime authorization system.

Record Keeping Requirements: Legal obligation to maintain overtime records for a minimum period of 2 years, including documentation of authorization and actual overtime worked.

Rest Day and Public Holiday Regulations: Special provisions for overtime work performed on rest days and public holidays, including different calculation rates and additional protections for workers.