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Singapore GST calculator
Add 9% GST to an amount or extract the GST already included in a total.
Runs in your browser. Inputs are not sent or saved, and no AI request is used.
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How to use the result
The calculation applies 9% to one entered amount, rounded to the nearest cent. It does not determine whether you must register or whether a supply is standard-rated, zero-rated or exempt.
Reference: IRAS current 9% GST rate. Only GST-registered businesses may charge GST. Rate checked 1 October 2026.