Crypto Gain Tax Calculator

This New Zealand calculator estimates the tax on cryptocurrency gains, which Inland Revenue generally treats as taxable. You enter your buy and sell values in New Zealand dollars, and it works out the gain and the tax at your marginal rate, with a clear note that crypto is taxed as property and that record-keeping in New Zealand dollars is essential. It helps the growing number of Kiwi crypto holders understand and plan for an obligation many overlook.

$
$
$0
estimated tax on your crypto gain
Gain$0
After-tax gain$0

Inland Revenue generally treats crypto as property, and there is no separate capital gains tax, so gains are taxed at your income tax rate. Use New Zealand dollar values at the time of each transaction and keep accurate records. Losses and frequent trading have their own treatment. Estimate only, not tax advice.

How it works

The calculator subtracts your buy cost from your sale value, both in New Zealand dollars, to find the gain. If there is a gain, it applies your marginal tax rate, because the gain is added to your other income and taxed at the rate your income reaches. It then shows the after-tax gain. Because crypto is treated as property and converted to New Zealand dollars at each transaction, keeping good records is essential to getting this right.

Worked example

Buying crypto for $5,000 and selling for $9,000 is a $4,000 gain. At a 33% marginal rate, the tax is about $1,320, leaving an after-tax gain of $2,680. The exact rate depends on your total income, so a large gain can push some of it to the top rate.

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