Invoice format and locale facts for Singapore

Why these defaults?

The country code comes from ISO 3166. Unicode CLDR supplies presentation-oriented locale, currency, paper, date, language, calendar, numbering, and direction metadata. Defaults reduce setup time; they do not decide what a valid document must contain.

Recorded official or regional-official language tags: en, zh, ms, ta.

Selected national claims reviewed

Document vocabulary and checks

Core Singapore GST tax-invoice timing and particulars, the S$1,000 simplified-invoice ceiling, Singapore-dollar presentation for foreign-currency tax invoices, five-year invoice retention and current InvoiceNow phases are reviewed. InvoiceNow applies to new voluntary GST-registration applications from 1 April 2026 and expands in later phases. This local preview does not transmit structured invoice data to IRAS or the Peppol-based InvoiceNow network; exclusions, onboarding, special schemes and transaction-specific GST treatment remain separate checks.

Evidence snapshot: 3 official sources · last reviewed 2026-07-20. This is scoped guidance, not a jurisdiction-wide compliance certification.

Tax labels: GST. Business identifier labels: GST Registration Number / Unique Entity Number (UEN).

• Required when applicable: When a Singapore GST tax invoice is required, issue it within 30 days of the time of supply and show the supplier's GST registration number with the required supplier, customer, invoice, supply, GST-rate, and total information. A simplified tax invoice may be used when the GST-inclusive total does not exceed S$1,000; foreign-currency amounts must also show their Singapore-dollar equivalents where IRAS requires them.Evidence SG_IRAS_INVOICING · reviewed 2026-07-19 · review by 2027-01-19 · automation advisory only
• Required when applicable: GST-registered businesses must keep proper business and accounting records, including issued invoices and receipts, for at least five years. IRAS also permits electronic records subject to its record-keeping requirements.Evidence SG_IRAS_RECORDS · reviewed 2026-07-20 · review by 2027-01-20 · automation advisory only
• Guidance: InvoiceNow is a Peppol-based structured invoicing and GST-data submission regime with phased applicability. This generator does not register for InvoiceNow, create a Peppol invoice, transmit through an access point, or submit invoice data to IRAS.Evidence SG_IRAS_INVOICENOW · reviewed 2026-07-19 · review by 2027-01-19 · automation advisory only

Identifier format guidance: See the relevant authority.