Add GST to a base price, to find the final amount you need to pay.
GST is calculated on the base price and added to it.
Total: Base price × (1 + rate/100)
What GST rates are available under GST 2.0?
Since 22 September 2025, the main rates are 5% and 18%. A 40% rate applies to a short list of luxury and sin goods. Gold, silver, and gems stay at their own 3% rate.