GST Act: Singapore's Goods and Services Tax Act - Governs the application and collection of GST, which must be reflected on invoices if the company is GST-registered
Income Tax Act: Regulates taxation of income in Singapore - Relevant for maintaining proper invoice records for tax reporting purposes
Companies Act: Primary legislation governing business entities in Singapore - Sets requirements for business documentation and record-keeping
Business Registration Act: Governs the registration of businesses and display of registration information on business documents including invoices
Electronic Transactions Act: Provides legal framework for electronic transactions and documents, including electronic invoices
Contract Law: Common law principles governing contract formation and enforcement in Singapore
Unfair Contract Terms Act: Regulates unfair terms in contracts and protects against unreasonable contract conditions
Payment Systems (Oversight) Act: Regulates payment systems and payment methods in Singapore
IRAS Requirements: Inland Revenue Authority of Singapore's specific requirements for invoice format, including mandatory fields like UEN, GST registration number, and invoice details
Late Payment Regulations: Rules governing late payment penalties and interest charges in commercial transactions
