GST calculator Singapore (9%)
Add GST to a price before tax, or take GST out of a price that already includes it.
Worked example
A receipt shows S$250 including GST. Price before GST = S$250 / 1.09 = S$229.36, so the GST inside is S$20.64. (GST is not 9% of S$250 - that would overstate it.)
Figures computed with the same formula as the calculator and unit-tested against official examples.
How it works
Singapore's GST rate has been 9% since 1 January 2024 (it was 8% in 2023 and 7% before that). To add GST, multiply the pre-GST price by 1.09. To find the GST inside a GST-inclusive price, divide by 1.09 to get the pre-GST price and subtract.
A common mistake is taking 9% of a GST-inclusive price; the GST portion of an inclusive price is 9/109 (about 8.26%) of it. Only GST-registered businesses may charge GST, and they must show prices inclusive of GST to consumers.
FAQ
What is the GST rate in Singapore now?
9%, effective from 1 January 2024, per IRAS.
How do I calculate GST from a total price?
Divide the total by 1.09 for the price before GST; the difference is the GST. For S$109 that is S$100 + S$9 GST.
Can I use an older rate?
Yes - change the rate field to 8 or 7 to check invoices from 2023 or earlier.
Sources & rates as of 12 Nov 2026
If an official rate changes, the official page wins. Spotted an outdated figure? This page is reviewed regularly.