BillCrisp

Singapore GST Tax Invoice Generator

The Singapore preset uses Singapore dollars, A4 paper, a GST Reg No. field and the 9% rate, and titles the document Tax Invoice as IRAS requires.

This summary of IRAS guidance is general information, not tax advice. A PDF does not replace InvoiceNow transmission where that applies to you. Other countries: what to include on an invoice.

What a Singapore tax invoice must show

IRAS tax invoice details and where to enter them
Required detailIn BillCrispSource
The words "Tax Invoice"Printed automatically with this preset[1]
Supplier's name and addressYour details[1]
GST registration numberYour details, GST Reg No.[1]
Invoice dateIssue date[1]
An invoice identifying numberInvoice number[1]
Customer's name and addressCustomer details[1]
Description of goods and servicesLine description[1]
GST rateTax rate per line[1]
Total amount payable excluding GSTSubtotal[1]
Total GSTGST total[1]
Total amount payable including GSTTotal[1]

If an invoice also covers exempt, zero-rated or other supplies, IRAS requires the gross amount for each type of supply to be stated separately. [1] Put each type on its own lines with the matching rate; the summary then lists each rate group.

Example: a standard-rated invoice

Services billed at 9% GST
LineAmount (SGD)
Website maintenance, October2,000.00
GST at 9%180.00
Total including GST2,180.00

Because the total is above $1,000, this needs a full tax invoice rather than a simplified one. Keep copies of the tax invoices you issue and receive for at least 5 years. [1]

When to issue one

You must issue a tax invoice when your customer is GST-registered, generally within 30 days of the time of supply. It is not needed for zero-rated, exempt or deemed supplies, or for customers who are not GST-registered. [1]

If the total including GST is $1,000 or less, you may issue a simplified tax invoice instead: your name, address and GST registration number, the date, an identifying number, a description, the total including GST and a statement such as "price payable includes GST". [1] Tick Prices include GST and add that statement to Notes.

Invoicing in a foreign currency

When you invoice in another currency, IRAS requires the total excluding GST, the total including GST and the total GST to be converted into Singapore dollars on the tax invoice. [1] BillCrisp calculates in one currency, so add the three SGD amounts and the exchange rate used to Notes.

InvoiceNow

IRAS is phasing in the GST InvoiceNow requirement, under which GST-registered businesses transmit invoice data to IRAS through InvoiceNow-Ready Solutions. It started on 1 November 2025 for newly incorporated companies that register voluntarily, extends to new voluntary registrants from 1 April 2026, and reaches all existing GST-registered businesses in stages up to 1 April 2031. [2] A PDF from BillCrisp is a readable invoice for your customer, not an InvoiceNow transmission.

Sources