Crypto Cost Basis FIFO Calculator

This calculator works out the cost basis and taxable gain when you sell cryptocurrency in New Zealand, using the first in, first out method that Inland Revenue accepts. It matters because, contrary to a common myth, crypto is not tax free here: Inland Revenue treats crypto-assets as property, and because most people buy them intending to sell, the gains are usually taxable income at your marginal rate. There is no separate capital gains tax, but the profit is still taxed, so working out the gain correctly is essential. The tricky part is the cost basis when you have bought in several lots at different prices and then sell only some of your holding. First in, first out solves this by matching the sale against your earliest purchases first, so the cost of the coins sold is what you paid for the oldest ones. You enter up to three buy lots with the quantity and price of each, then the quantity and price of your sale, and the calculator walks through the lots in order, totals the matched cost, and shows the proceeds, the gain, and the tax at the marginal rate you choose. Keep thorough records of every transaction, because Inland Revenue expects you to be able to show your workings. This is general information, not tax advice.

Crypto gains are usually taxable income in NZ, at your marginal rate. Keep records of all trades. General information, not tax advice.