Free tools
Free Singapore GST, UEN and PayNow tools
GST at 9% added to or taken out of a price (9/109), UEN format checks and PayNow QR codes. The GST result opens as a ready Singapore invoice, free and without sign-up.
Calculators
- GST calculatorAdd 9% GST to a price or take it out of a GST-inclusive price (9/109), then open it as a ready Singapore tax invoice. Free, instant, no sign-up.
- UEN checkerCheck a Singapore UEN’s format — business, local company or other entity — in your browser, and see how it prints on an invoice. Nothing is sent anywhere.
- PayNow QR code generatorMake a PayNow QR code for your UEN or mobile number, with an amount and reference, in your browser. The same QR code our Singapore invoices print.
Frequently asked questions
Are these tools free?
Yes, all of them, with no sign-up. They run in your browser: nothing you enter is sent to us.
Can I turn a result into an invoice?
Yes. The GST calculator has a button that opens our free Singapore invoice generator with the amount filled in. Add your UEN and your customer, and download the PDF with a PayNow QR code.