GST
GST Inclusive / Exclusive Calculator
Work out the taxable value and GST contained in a GST-inclusive price, or the inclusive price from a base price.
Applies to: Rates in force from 22 September 2025
Result
Formula
- From inclusive: Taxable value = Amount × 100 ÷ (100 + Rate); GST = Amount − Taxable value
- From exclusive: GST = Amount × Rate ÷ 100; Inclusive = Amount + GST
Assumptions
- Single GST rate on the whole amount.
Official sources
Illustrative only. This calculator shows results from the inputs and assumptions above. It is not personalised professional advice and does not consider your specific facts. Rates were last checked on 9 November 2026.