Contract Act (Cap. 53): Primary legislation governing contract formation, terms, and enforcement in Singapore
Electronic Transactions Act: Regulations governing electronic contracts and digital signatures for electronic invoices
Goods and Services Tax Act: Law governing GST application, registration requirements, and tax invoice requirements
Income Tax Act: Legislation covering taxation aspects of business transactions and record-keeping requirements
Payment Services Act 2019: Regulates payment systems and payment service providers in Singapore
Currency Act: Laws governing the use of currency and monetary transactions in Singapore
Consumer Protection (Fair Trading) Act: Protects consumers against unfair practices and ensures fair trading terms
Unfair Contract Terms Act: Restricts the extent to which civil liability for breach of contract can be avoided through contract terms
Companies Act: Primary legislation governing company operations including Section 199 on record keeping requirements
Business Names Registration Act 2014: Regulates the registration and display of business names on official documents including invoices
IRAS Record Keeping Requirements: Mandatory 5-year minimum period for maintaining business and transaction records
IRAS Tax Invoice Requirements: Specific requirements for valid tax invoices including business information and GST registration details
