GST Calculator (New Zealand)

Calculate a New Zealand GST-exclusive or GST-inclusive amount with a clear tax breakdown.

Total including tax
$1,150.00
GST: $150.00 at 15% (tax exclusive)
Net taxable value $1,000.00
Total GST (15%) $150.00
GST (15%) $150.00
Gross total $1,150.00
Inputs
⚡ Scenarios:
NZD
Enter a pre-tax amount or an amount that already includes GST.
The standard GST rate is 15%. Zero-rated and exempt supplies are different treatments; confirm the correct category before calculating.
Choose the treatment that applies to your supply. This calculator does not classify goods or services.
Choose whether the amount already includes tax.
Select the New Zealand tax calculation mode.
Results & Graph
Total including tax
$1,150.00
GST: $150.00 at 15% (tax exclusive)
Net taxable value
$1,000.00
Total GST (15%)
$150.00
GST (15%)
$150.00
Gross total
$1,150.00

GST amount breakdown

Tax added to the entered amount
Graph 1 • GST amount breakdown Tax added to the entered amount
Net taxable value: 1,000 NZDGST: 150 NZD Net taxable value 1,000 NZD GST 150 NZD
Graph 2 • Proportional Share Ring Net vs. tax/interest share
TOTAL 1.1k Net taxable value 1.0k (87.0%) GST 150 (13.0%)
Graph 3 • Tax amount at entered rate and comparison rates (NZD) Statutory benchmark comparison across brackets or years
0% $0.00 7.5% $75.00 15% $150.00 22.5% $225.00 30% $300.00
Summary: Net value $1,000.00; GST $150.00; total $1,150.00.
Summary: Standard-rated supply. Net amount $1,000.00, tax $150.00, total $1,150.00.
⚠️ Estimate only. The correct tax treatment and rate depend on the supply and applicable rules; verify with the official tax authority.
⚡ Chain Result ($1,150.00) To: GST (India) (Applicable GST Rate (%)) →Percentage (First Value (X)) →
Interactive chart & math engine powered by CalculatorGraph

Formula & Mathematical Methodology: GST inclusive and exclusive formulas

Exclusive: tax = net × rate
total = net + tax. Inclusive: net = total ÷ (1 + rate)
tax = total − net.
Exclusive: tax = net × rate; total = net + tax. Inclusive: net = total ÷ (1 + rate); tax = total − net.
  • net: Price before tax
  • total: Price including tax
  • rate: The applicable rate selected by the user

Rounding: Rounded to 2 decimal places.

Worked Example: $1,000 before tax at 15%

A standard-rated New Zealand supply is priced before GST.

  1. Tax is calculated by multiplying the net amount by 15%.
  2. The tax is added to the net amount to get the total.
Result: The total is the net price plus GST at the entered rate.

Frequently Asked Questions

How do I remove GST from an inclusive price?

Select the inclusive mode and enter the applicable rate. The calculator divides the total by (1 + rate) to estimate the pre-tax value.

Which GST rate should I use?

Rates depend on the goods or services and their circumstances. Confirm the applicable rate and treatment with the official tax authority before relying on the result.

Does this calculator determine whether my supply is taxable?

No. Select a treatment only after confirming the rules that apply to your supply.

Finance & Investing · New Zealand Tax & Invoicing

GST Calculator (New Zealand): inputs, method, and how to read the result

Calculate a New Zealand GST-exclusive or GST-inclusive amount with a clear tax breakdown.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Transaction amount: Enter a pre-tax amount or an amount that already includes GST.
  • Applicable GST rate (%): The standard GST rate is 15%. Zero-rated and exempt supplies are different treatments; confirm the correct category before calculating.
  • Tax treatment: Choose the treatment that applies to your supply. This calculator does not classify goods or services.
  • Calculation mode: Choose whether the amount already includes tax.

What the calculation includes

With the default values shown, Total including tax is $1,150.00. The calculation follows GST inclusive and exclusive formulas; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Transaction amount from 1,000 NZD to 1,100 NZD changes Total including tax from $1,150.00 to $1,265.00. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses the selected tax treatment and user-entered rate. Rates and category eligibility can vary by supply and change over time.
  • Does not determine tax classification, registration obligations, special schemes, or cross-border tax liability. Verify against current New Zealand authority guidance.

Scope: New Zealand Check the assumptions and limitations against your situation before relying on the estimate.

More in Finance & Investing: GST Calculator (India), Percentage Calculator.