Document background
The Commercial Sales Invoice is a fundamental business document used in Singapore's commercial transactions to formalize sales of goods or services. It serves multiple purposes: as a payment request, a tax document for GST compliance, and a record for accounting and audit trails. When issuing a Commercial Sales Invoice in Singapore, businesses must ensure compliance with IRAS requirements, particularly regarding GST if their turnover exceeds SGD 1 million. The document must include specific elements such as unique invoice numbers, business details, and proper tax calculations to be considered valid under Singapore law.
