Crypto Card Tax Calculator

Why spending crypto can create a tax bill

Paying with a crypto card feels like spending money, but in most tax systems it counts as selling crypto. The card provider converts your coins at the moment of payment, and that conversion is a disposal.

If the coins are worth more than you paid for them, you have a gain, even though you never withdrew cash. Small purchases add up over a year, which is why card users can end up with more taxable events than traders.

Cost basis

Cost basis is what you originally paid for the coins you spend, including fees. The gain on each purchase is the value spent minus that cost.

When you bought the same coin at different prices, the jurisdiction’s matching rules decide which purchase counts first. Keeping a record of every card transaction makes this far easier at tax time.

United States

The IRS treats digital assets as property. Spending them is a disposal, and the gain is short-term or long-term depending on whether you held the asset for more than a year.

Short-term gains are taxed at ordinary income rates, and long-term gains at the lower capital gains rates. The calculator uses the 2026 brackets for single filers and leaves out state tax.

United Kingdom

HMRC treats spending crypto as a disposal for Capital Gains Tax. Everyone has an annual exempt amount, and gains above it are taxed at the rate for your Income Tax band.

Other gains in the same tax year use up the exempt amount first, so the calculator asks for them.

Germany

German law treats crypto as a private asset. Gains on coins held for more than a year are tax-free.

For shorter holdings, private sale gains stay tax-free when the year’s total is below the exemption limit. Once the total reaches it, the whole gain is taxed at your personal income tax rate.

Portugal

Portugal taxes gains on crypto held for less than 365 days at a 28% autonomous rate, with an option to include them in your general income instead. Coins held for 365 days or more are excluded, with some exceptions for counterparties in listed tax havens.

Stablecoins and cashback

Spending a stablecoin usually creates little or no gain, because its price stays close to what you paid. It can still count as a disposal, so it is worth recording.

Cashback is less settled. Some tax authorities treat rewards as income, while others have not published guidance on card rewards specifically. The calculator follows official guidance only.

Limits of an estimate

This tool gives an estimate for one purchase or a small batch. It does not replace a full tax return, and personal allowances, losses carried forward and other income can change the result.

The crypto card tax guide explains the rules in more depth, and the guide to how crypto debit cards work shows where the conversion happens. For anything significant, a qualified tax professional can confirm how the rules apply to you.