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GST calculator

Add GST, remove GST and compare the before-tax and after-tax price in a single step. It is a quick tool for quotes, invoices and business expenses.

Best for
  • 10% Australian GST rate mirrored from the imported calculator
  • Inclusive and exclusive entry modes with the same divide-by-1.1 behavior
  • Reusable ex-GST, GST and inc-GST outputs for pricing and fee flows

Your amount

Enter the price you have, then choose whether that amount already includes GST.

Negative values are normalized to zero, matching the native service behavior.
Income tax calculator

Results

The output below preserves the MoneySmart three-line summary so inclusive and exclusive prices stay explicit.

Price (ex GST) $1,000.00
GST $100.00
Price (in GST) $1,100.00

Starting from $1,100.00 as a GST-inclusive amount, the GST component is $100.00.

What to watch

  • Inclusive and exclusive conversion is directly reusable for fee comparisons and settlement-cost presentation.
  • Business-expense normalization can support self-employed borrower evidence and cashflow assessment.
  • Keeping tax-separated prices explicit helps downstream recommendation and quote explanations stay clearer.

How these estimates work

  • This calculator assumes a standard taxable sale with 10% GST.
  • To work out the cost including GST, the amount exclusive of GST is multiplied by 1.1.
  • To work out the GST component from an inclusive price, the amount is divided by 11.
  • GST-free and input-taxed sales are outside the scope of this calculator.