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Goods and Services Tax Act: Governs GST requirements for invoicing if the contractor is GST-registered. Includes requirements for GST registration number display and tax calculations.

Income Tax Act: Regulates income tax obligations and reporting requirements for contractors in Singapore.

IRAS Invoice Requirements: Specific requirements from the Inland Revenue Authority of Singapore for invoice format, including mandatory fields like invoice number, date, and business details.

Employment Act: Helps determine proper classification between contractors and employees to avoid misclassification issues.

Contract Law (Cap. 43): Provides legal framework for contractual relationships and agreements in Singapore.

Electronic Transactions Act: Governs the use of electronic invoicing and digital signatures in business transactions.

Personal Data Protection Act (PDPA): Regulates the collection, use, and disclosure of personal data in business documents and transactions.

Companies Act: Outlines requirements for business operations and documentation for companies in Singapore.

Business Registration Act: Governs the registration and identification of businesses in official documents.

Invoice Content Requirements: Mandatory elements including invoice number, date, business details, customer information, service description, charges, GST details, and payment terms.