GST Calculator

GST Calculator

Add goods and services tax to a pre-tax amount and estimate the gross total.

MALAMALAMA KI TE TALI

E fuafua pefea te mea tenei?

This calculator applies the displayed tax formula directly to your inputs. It keeps full precision during the calculation and rounds only the displayed result.

GST formulaTotal = pre-tax amount × (1 + GST rate)

He fakaaogāga moni

Using the default example values, the calculator substitutes 100 and 5 into the formula. Change the values to model your own scenario.

Tali ne fuafua

Pre-tax amountGST rateTali ne fuafua
$80.005%$84.00
$100.005%$105.00
$120.005%$126.00

Nā manatu, fakamatala ma nā hē mahani

Nā manatu o te fuafuaga

  • The values entered for pre-tax amount and gst rate are accurate for the scenario.
  • Rates and recurring amounts remain constant for the period represented by the formula.
  • Provider fees, taxes and timing differences are excluded unless they are explicit inputs.

Auala ke fakamatala te tali

  • Treat the main number as a planning estimate, not a quote, approval or guarantee.
  • Compare at least a baseline, lower and higher assumption before deciding.
  • Use the result together with the related tax calculators for a broader view.

Nā hē mahani ke kalo kehe mai ai

  • Entering a percentage as a decimal when the field expects a whole percent.
  • Comparing results that use different time periods or omit different fees.
  • Rounding inputs early or treating an estimated rate as guaranteed.