Crypto taxes explained: why disposals can be taxable and how to keep records

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Many people assume crypto is only taxed when they cash out to their bank. In many countries that is wrong, and the mistake can lead to unexpected bills, interest and penalties. Tax rules differ between countries and change often, so this guide sets out the general ideas and points you to where to check. It is not tax or financial advice.

The key idea: disposals

In many tax systems, including the UK and the US, cryptoassets are treated as property or assets rather than currency. Tax is often triggered when you dispose of an asset. Depending on where you live, a disposal can include:

Selling crypto for money, such as pounds, euros or dollars.
Swapping one cryptoasset for another, including into a stablecoin.
Spending crypto on goods or services.
Giving crypto away, although gifts to a spouse or civil partner are treated differently in some countries.

The gain or loss is usually the difference between what the asset was worth when you disposed of it and what it cost you, including allowable fees. Simply buying crypto with money and holding it is generally not a disposal.

Income is different

Some crypto receipts may be taxed as income rather than as gains. Examples often include:

Being paid in crypto for work.
Mining rewards.
Staking rewards and some lending interest.
Airdrops in certain circumstances.

How each of these is treated varies a great deal by country, and some areas, such as decentralised finance, can be complicated.

Why records matter

Working out gains means knowing what each coin cost. Over several exchanges and wallets, this gets hard quickly. Some countries also have special matching rules: in the UK, for example, HMRC uses pooling and specific rules for buying back within a short period, which affect the cost you use. Keep, for every transaction:

The date and, where relevant, the time.
The type: buy, sell, swap, transfer, gift or reward.
The asset and amount.
The value in your home currency at the time.
Fees paid.
Wallet addresses and exchange names involved.
Supporting documents, such as exchange statements and bank records.

Transfers between your own wallets are usually not disposals, but record them so your trail of ownership is complete.

Practical record-keeping tips

Export transaction histories regularly. Exchanges close, change systems or delete old accounts. Download a full history at least once a year.
Use a spreadsheet or reputable crypto tax software, and check its output rather than trusting it blindly.
Record losses as well as gains. In many systems, losses can be set against gains, but often only if you report them.
Keep records for as long as your tax authority requires, which may be several years.
Note anything unusual, such as tokens lost in a hack or a collapsed platform. Treatment differs, and evidence helps.

Authorities are getting more information

Tax authorities increasingly receive data directly from crypto platforms. Many countries are adopting the OECD's Cryptoasset Reporting Framework, under which platforms collect customer and transaction details and share them with tax authorities. In the UK, platforms began collecting this information from the start of 2026, with reports to HMRC following. Using an overseas exchange does not necessarily avoid reporting, since authorities exchange data. Assume your tax authority can see your activity.

Where to check the rules

UK: HMRC's guidance on cryptoassets and Capital Gains Tax, on GOV.UK.
US: the IRS's guidance on digital assets, including the digital asset question on federal tax returns.
Elsewhere: your national tax authority's website, which will set out reporting deadlines and allowances.

If you have many transactions, income from crypto or any DeFi activity, consider a qualified accountant or tax adviser who knows cryptoassets. Remember that crypto values can fall as well as rise, and losses are possible. How do you keep track of your crypto records? Share your methods and tools in the comments.