New Zealand 15% GST Calculator
How to Correctly Calculate Goods & Services Tax Costs for New Zealand
These New Zealand GST calculators work out:
- The GST to add to an GST Exclusive amount
- The GST content of a GST Inclusive amount
- The original costs based just on the GST amount
NZ Online GST Calculator
Enter any known amount into the appropriate box to calculate the other 2 figures.
- Add 15% GST to a GST Exclusive Price
- Find the GST component of a GST Inclusive Price
- Find GST Exclusive Price from full cost including GST
The mathematics behind calculating GST in NZ
Basic GST Calculations.
Adding GST
Goods and Services Tax in NZ is 15%
To add 15% GST on $100
- $100 x 15% = $15 GST
- $100 + $15 GST = $115 GST Inclusive.
A quick way to Add GST is to Multiply
the GST exclusive amount by 1.15
Examples Below:
- $200 + GST = $200 x 1.15
= $230 - $500 + GST = $500 x 1.15
= $575
Subtracting GST
Inland Revenue (IRD) recommends the following formula to find the GST amount from a GST inclusive price.
- GST Inclusive Price X 3 ÷ 23 = GST Amount
Working backwards to find the GST and GST exclusive amounts from the total GST inclusive price.
- $115 X 3 ÷ 23 = $15 GST
To work out the GST exclusive amount simply subtract the GST from the GST inclusive amount to get the original GST exclusive cost.
- $115 – $15 GST = $100
We're now back to the start with a GST exclusive price.
When using the correct formula, you can see the $15 GST cost remains the same when adding GST on and finding the GST amount from the inclusive price.
Subtracting GST the wrong way!
Don't Just Remove 15%
Just subtracting 15% from the GST inclusive price won't work.
- 15% of $115 = $17.25
(not $15)
To subtract 15% from our $115 GST inclusive figure from above…
- $115 – 15% = $97.75
(not $100)
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