GST calculator Singapore (9%)

By MoneyBees

Add or remove 9% GST, use the 9/109 tax fraction, total an invoice per line or on the subtotal as IRAS allows, and price a restaurant bill with service charge.

Frequently asked questions

What is the GST rate in Singapore?

9%. It has applied since 1 January 2024. It was 8% in 2023 and 7% from 1 July 2007 to 31 December 2022. GST started at 3% on 1 April 1994.

How do I add GST to a price?

Multiply the price before GST by 1.09. The GST on its own is the price times 9%. S$100 before GST is S$109 with GST, and the GST is S$9.

How do I work out the GST inside a price that already includes it?

Multiply the GST-inclusive price by 9/109. That is the GST. Take it away from the price to get the amount before GST. On S$109 the GST is S$9. On S$90 it is S$7.43.

Why does my invoice GST differ by a cent from my own sum?

IRAS lets a business either work out 9% on each line and add the lines up, or work out 9% once on the subtotal, and rounding makes the two differ by a cent or so. Both are allowed as long as the business uses the same method every time.

How is GST rounded?

The total GST is rounded to the nearest cent. A business may also round the whole bill to the nearest 5 cents for cash payments, up or down, as long as it does the same every time.

Do restaurants charge GST on the service charge?

Yes, GST is charged on the food and on the service charge. A S$100 meal with a 10% service charge comes to S$110 before GST, and 9% GST on that is S$9.90, so the bill is S$119.90.

Must shops show prices with GST?

Yes, if they are GST-registered. Price tags, adverts and websites must show the GST-inclusive price. Hotels and restaurants that add a service charge may show prices before GST if they say clearly that GST and service charge apply.

When must a business register for GST?

When its taxable turnover is more than S$1 million. Businesses below that can choose to register.

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