GST Tax Invoice Generator (Singapore, 2026)
A Singapore tax invoice must show the words "Tax Invoice", your name, address and GST registration number, the invoice date and number, the customer's name and address, a description, the GST rate, and the totals excluding GST, the GST and the total including GST (IRAS). GST is 9%. Up to S$1,000 including GST you may issue a simplified tax invoice.
For businesses and freelancers billing their own real sales. An invoice or receipt for a supply or payment that did not happen is a false document. Figures are entered by you and are not checked by AiStaffo.
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What a Singapore tax invoice must show (IRAS)
| Title | The words "Tax Invoice" |
|---|---|
| Supplier | Name, address and GST registration number |
| Number and date | Invoice date and an identifying number |
| Customer | Name and address |
| Items | Description of the goods or services |
| GST | The GST rate, the total excluding GST, the GST amount and the total including GST |
| Simplified tax invoice | If the total including GST is S$1,000 or less: supplier details and GST number, date, number, description, total including GST and a statement that the price includes GST |
| Foreign currency | Totals excluding GST, GST and including GST must also be in Singapore dollars, at an approved exchange rate |
| Time limit | Generally within 30 days from the time of supply |
| GST rate | 9% |
Worked example
Consulting S$1,500 at 9% GST: GST S$135.00, total S$1,635.00, so a full tax invoice is needed. A café sale of S$545.00 including GST can use a simplified tax invoice: GST is 545 × 9 ÷ 109 = S$45.00.
Invoicing in US dollars
Choose USD and enter the exchange rate to SGD. The invoice adds the total excluding GST, the GST and the total in Singapore dollars, as IRAS requires.
For businesses: let the invoicing run itself
Singapore businesses also file GST F5 returns and keep InvoiceNow-ready records. Raising invoices, matching payments and chasing overdue clients is routine work an AI worker can run end to end, with your team only checking exceptions. Book a free automation audit and we will show you what it would take off your desk.
Please note: this generator follows the IRAS invoicing rules as checked on 21 October 2026. It does not send invoices through InvoiceNow (Peppol). Check whether a supply is zero-rated or exempt with IRAS or your accountant.
Sources
Questions people ask
What must a tax invoice include in Singapore?
When can I issue a simplified tax invoice?
What is the GST rate in Singapore in 2026?
How soon must I issue a tax invoice?
Can a business that is not GST registered issue a tax invoice?
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