# GST Calculator Singapore: Add or Remove 9% GST, and ++ Bills

Add or remove Singapore's 9% GST in one step, and work out restaurant ++ bills (10% service charge, then GST on top) with a per-person split.

Interactive tool: https://lookup.sg/tools/gst-calculator

## How this works
Singapore's Goods and Services Tax has been 9% since 1 January 2024 (8% in 2023, 7% before that). To add GST, multiply the price by 1.09. To remove it from a GST-inclusive price, divide by 1.09; the GST inside the price is 9/109 of it.

A “++” price at a restaurant means service charge and GST are both added. The service charge (usually 10%) is added first, and GST is charged on the food plus the service charge, so the bill is the menu price × 1.10 × 1.09 = 1.199. Service charge is set by the restaurant, not by law, so you can pick another rate.

Amounts are rounded to the cent at each step, as on a till receipt. A business may round its total slightly differently.

## FAQs
### How do I calculate 9% GST in Singapore?
Multiply the price by 0.09 to get the GST, or by 1.09 for the total. S$100 before GST is S$109 with GST, of which S$9 is GST.

### How do I remove GST from a price?
Divide the GST-inclusive price by 1.09. A S$109 price is S$100 before GST. To find just the GST inside a price, multiply it by 9/109: S$50 includes S$4.13 of GST.

### What does ++ mean on a Singapore menu?
It means 10% service charge and 9% GST are added to the listed price. A S$100 ++ meal comes to S$119.90: S$10 service charge, then S$9.90 GST on S$110.

### Is GST charged on service charge?
Yes. GST applies to the service charge as well as the food, which is why a ++ bill is 1.199 times the menu price rather than 1.19.

## Sources
- [IRAS: Current GST rates](https://www.iras.gov.sg/taxes/goods-services-tax-(gst)/basics-of-gst/current-gst-rates)

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Source: Lookup (https://lookup.sg) · Data as of October 2026 · Listings compiled from Singapore government open data (data.gov.sg), OneMap and Overture Maps places. Free listings never show contact details; contact details appear only on Lookup Verified listings.