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Goods and Services Tax Act: Primary legislation governing GST in Singapore (Cap. 117A). Covers GST registration requirements (mandatory if turnover exceeds SGD 1 million), GST charging requirements (8%, increasing to 9% in 2024), and tax invoice format requirements.

Income Tax Act: Key legislation (Cap. 134) governing income taxation in Singapore, including requirements for business income reporting and invoice documentation for tax purposes.

Contract Law: Fundamental legislation (Cap. 43) governing the formation and enforcement of contracts in Singapore, including service agreements and commercial transactions.

Electronic Transactions Act: Legislation (Cap. 88) governing the validity and use of electronic transactions and records, including electronic invoices and digital signatures.

Business Registration Act: Legislation governing business registration requirements and mandatory business information that must appear on commercial documents including invoices.

Companies Act: Legislation specifying requirements for company information and documentation, including necessary company details on commercial invoices.

Late Payment Interest Convergence Act: Legislation governing late payment interest and terms in commercial transactions.

Payment Services Act 2019: Legislation regulating payment services and payment processing in Singapore.

Consumer Protection (Fair Trading) Act: Legislation protecting consumer rights in B2C transactions, relevant if services are provided to individual consumers.

Personal Data Protection Act: Legislation governing the collection, use, and disclosure of personal data in commercial transactions and documentation.

IRAS Invoice Requirements: Regulatory requirements from the Inland Revenue Authority of Singapore specifying mandatory content and format for valid commercial invoices.