Most UK crypto holders discover they have a tax obligation at exactly the wrong time — January, under deadline pressure, with no time left to plan. The rules are not complicated once you understand them, but they do catch people out.
Holding crypto is not taxable — but almost everything else is
You do not owe tax just because Bitcoin went up in value. HMRC only cares when you dispose of crypto. A disposal is any event where you give up ownership — and the list is longer than most people expect.
- —Selling crypto for GBP or any fiat currency
- —Swapping one crypto for another (BTC → ETH counts as a disposal of BTC)
- —Spending crypto on goods or services
- —Gifting crypto to anyone other than your spouse or civil partner
- —Receiving crypto as payment for work or services
Transfers between your own wallets and exchanges are not disposals — moving BTC from Coinbase to a hardware wallet does not trigger tax.
Capital Gains Tax: the basics
When you dispose of crypto, any profit above your purchase cost is a capital gain. For 2024/25, the annual CGT exempt amount is £3,000 — gains below this are not taxed. Above the threshold, the rate is 18% for basic rate taxpayers and 24% for higher or additional rate taxpayers.
Worked example
You bought 0.5 BTC for £8,000 in 2022 and sold it for £20,000 in 2024. Your gain is £12,000. After the £3,000 annual allowance, £9,000 is taxable. As a basic rate taxpayer, you owe £1,620 (18%). As a higher rate taxpayer, £2,160 (24%).
Losses from other disposals can offset gains. If you sold ETH at a loss in the same year, that loss reduces the total taxable amount.
Income Tax on crypto
Not all crypto income is Capital Gains Tax. Some is taxed as income at your usual income tax rate (20%, 40%, or 45%) in the year you receive it:
- —Staking rewards — taxed as miscellaneous income at the GBP value on the date received
- —Mining rewards — taxed as trading or miscellaneous income
- —Airdrops — usually income if you did something to receive them
- —Crypto received as salary or freelance payment
The reporting threshold you might not know about
Even if your net gain is below £3,000, you must file a Self Assessment if your total disposal proceeds exceed £50,000 in the tax year. This catches frequent traders who made small net gains across many transactions.
If you are already registered for Self Assessment for other reasons (self-employment, rental income), you must include crypto gains on your return regardless of the amount.
Frequently asked questions
Do I owe tax if I just held crypto and never sold?
No. Simply holding cryptocurrency — even if it has increased significantly in value — is not a taxable event. Tax only arises when you dispose of it. You could hold Bitcoin for ten years and owe nothing until you sell, swap, spend, or gift it.
What if I only traded small amounts — do I still need to declare?
It depends on the total proceeds, not just the gain. If your combined proceeds from all disposals in the year exceed £50,000, you must file a Self Assessment even if your net gain is below £3,000. Below both thresholds, you have no filing obligation — but keep records.
I made a loss on crypto — do I still need to do anything?
Yes — you should report losses to HMRC to preserve them for future use. Losses can be carried forward to offset future gains, potentially saving you significant tax. You have four years from the end of the tax year to make a loss claim, but you cannot claim losses retrospectively if you miss the window.
Does HMRC know about my crypto?
Likely yes, if you use regulated UK exchanges. HMRC has data-sharing agreements with exchanges like Coinbase and Kraken, and uses blockchain analytics tools. The assumption that crypto is invisible to HMRC is outdated and risky.
Is swapping crypto for crypto really taxable?
Yes. HMRC treats each cryptocurrency as a separate asset. When you swap BTC for ETH, you have disposed of BTC and acquired ETH. Any gain on the BTC since you bought it is subject to CGT — even though you never received any cash.
What records should I keep?
For every transaction: the date, the type (buy, sell, swap, staking reward, etc.), the asset, the quantity, and the GBP value at the time. Also keep records of any fees paid. HMRC can request records going back several years, so it is important to keep them even in years where you owe nothing.
General information only. Consult a qualified adviser for your specific situation.