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Crypto Taxes UK: HMRC Rules for 2025/26 Tax Year

Published January 24, 2026 Updated April 30, 2026 8 min read

UK tax return form and a laptop showing a crypto exchange transaction summary

UK crypto tax rules are more demanding than they look on first glance. The Capital Gains Tax allowance has been cut repeatedly (from £12,300 in 2022/23 to £3,000 in 2024/25 and continuing at £3,000 for 2025/26), which means many more retail crypto holders now have reportable gains than did five years ago. HMRC has been building its enforcement infrastructure in parallel. If you have any meaningful crypto activity and you’re UK tax-resident, you almost certainly have filing obligations you need to get right.

This guide covers the UK-specific mechanics for the 2025/26 tax year, filed by January 31, 2027. US readers should see the US crypto taxes guide.

For anything beyond routine retail activity (significant DeFi exposure, high-value positions, residency complications, prior-year issues), talk to a tax adviser. This is educational content, not personalized tax advice.

HMRC’s classification

UK tax year and disposals: conceptual overview (not tax advice)

HMRC treats cryptoassets as a form of property rather than currency. That sounds like a technical distinction but it shapes everything downstream: capital gains rules apply to disposals, income tax rules apply to receipts, the Section 104 pooling method applies to cost basis, and the 30-day rule applies to buying back what you sold.

Cryptoassets in HMRC’s guidance cover:

Exchange tokens (BTC, ETH, most altcoins, memecoins).
Utility tokens.
Security tokens.
Stablecoins.

Most retail UK tax situations involve exchange tokens. HMRC’s guidance lives in the Cryptoassets Manual online, which has grown substantially since 2019 and now covers DeFi, NFTs, staking, and most practical situations.

What triggers a disposal

UK Capital Gains Tax applies when you dispose of a cryptoasset. Disposals include:

Selling crypto for GBP or any fiat currency.
Trading one cryptoasset for another (BTC for ETH, stablecoin swaps, any token-to-token trade).
Spending crypto on goods or services.
Gifting crypto to anyone other than a spouse or civil partner.
Donating to a charity that isn’t specifically a registered UK charity.

What’s not a disposal:

Buying crypto with GBP.
Transferring between your own wallets.
Gifting crypto to your spouse or civil partner (no disposal; they take your cost basis).
Donating to a registered UK charity (no disposal; you can claim relief).

When you dispose of crypto, the capital gain or loss is the difference between disposal proceeds and cost basis. Cost basis is calculated using Section 104 pooling for most cases.

The Section 104 pool and how it works

Every type of cryptoasset you own sits in a “Section 104 pool” for tax purposes. All your BTC is one pool. All your ETH is another. All your USDC is another. The pool records:

The total units of that asset you hold.
The total cost basis you’ve paid for those units across all purchases.

When you buy more, both numbers increase. When you sell, the cost basis consumed is (pool’s total cost basis ÷ pool’s total units) × units sold. The pool continues with the remaining units at the same pool-wide cost basis per unit.

Example.

Buy 1 BTC for £40,000 in March 2024. Buy 1 BTC for £60,000 in September 2024. Pool: 2 BTC, £100,000 total cost, £50,000 per BTC.

Sell 1 BTC in August 2025 for £80,000. Cost basis consumed: £50,000. Capital gain: £30,000. Pool remaining: 1 BTC, £50,000 cost basis.

This is simpler than FIFO (used in the US) in the sense that you don’t track individual lots. It’s harder than FIFO in the sense that every purchase changes the pool average for all holdings of that asset forever.

Crypto tax software (Koinly, CoinLedger, Recap, Crypto Tax Calculator) calculates Section 104 pools automatically from your transaction history. Doing this by hand for active traders is impractical.

The 30-day rule

UK tax law modifies Section 104 pooling when you buy back the same asset within 30 days of selling it. Instead of the disposal going into the pool, the sale is matched against the buyback at the buyback’s cost basis.

This prevents a specific tax-avoidance pattern: sell BTC at a loss to crystallize the loss for offsetting gains, then immediately rebuy to keep the position. The 30-day rule denies the loss in that scenario by matching the sale against the re-purchase rather than against the pre-existing pool.

Example.

Pool of 2 BTC at £50,000 cost basis per coin (total £100,000). Sell 1 BTC on March 1 for £40,000. Looks like a £10,000 loss against the pool. Buy 1 BTC on March 15 for £42,000.

Under the 30-day rule, the March 1 sale is matched against the March 15 buyback. The disposal proceeds are £40,000, the cost basis is £42,000, so the realized loss is £2,000 instead of £10,000. The pool is unchanged: 2 BTC at £50,000 each.

This rule is intended to frustrate wash-sale-style tax harvesting. It does mean you can still harvest genuine losses; you just have to wait 30+ days before rebuying the same asset.

CGT allowance and rates for 2025/26

The annual allowance for 2025/26 is £3,000. Total net capital gains up to £3,000 are tax-free. Above that, the rates are:

10% for basic-rate taxpayers (income in the basic-rate band).
20% for higher-rate and additional-rate taxpayers.

The allowance applies to all capital gains across all asset types, not just crypto. If you have share gains and crypto gains, they share the £3,000 allowance.

The £3,000 allowance is a step down from £12,300 in 2022/23 and £6,000 in 2023/24. Many retail holders who had gains under the old allowance are now over the new one, without their activity having changed.

Reporting thresholds

You must file a self-assessment return reporting capital gains if:

Your total capital gains exceed £3,000 for the tax year, OR
Your total disposal proceeds exceed £50,000 for the tax year (the “4x allowance” threshold), even if net gains are under £3,000.

That second threshold catches people who traded heavily and ended up net positive by a small amount. £50,000 in disposals sounds like a lot; for an active trader, it’s easily reached.

If you don’t meet either threshold, you don’t need to file specifically for crypto, but you should still keep records in case HMRC raises a question or your situation changes.

Staking, mining, airdrops (income treatment)

Staking rewards are miscellaneous income under UK rules. Report the GBP fair market value on the day of receipt as income in the “miscellaneous income” section of your self-assessment. The received amount becomes the cost basis of those coins; when you later dispose of them, the capital gain/loss calculation starts from that basis.

Mining rewards follow the same treatment. Income at receipt, cost basis for future disposition.

Airdrops are more nuanced. HMRC distinguishes between:

Airdrops given for no action (just received because you held a token): treated as miscellaneous income at fair market value on receipt.
Airdrops received in exchange for a service (you did something to qualify, like using a protocol): treated as miscellaneous income with the same rules.

Both cases produce a cost basis in the received tokens equal to the income recognized. No difference in tax outcome; just different reasoning in HMRC’s framework.

DeFi activity

HMRC’s 2022 DeFi guidance introduced specific treatment for onchain activity. The general framework:

Adding liquidity to a DEX pool: treated as a disposal of the deposited assets.
Providing crypto for lending: generally not a disposal because beneficial ownership stays with you.
Interest earned: miscellaneous income at receipt.
Liquidity mining rewards: miscellaneous income at receipt.
Yield farming rewards: miscellaneous income at receipt.
Removing liquidity: disposal of the LP token.

The guidance has gotten more specific but remains less developed than US guidance in some areas. For significant DeFi activity, a UK crypto-specialist adviser is worth the fee.

Losses

Capital losses offset capital gains in the same tax year first. Excess losses can be carried forward indefinitely against future gains of the same category (capital gains).

Losses cannot be offset against income (salary, staking rewards, etc.) in the UK. This differs from some other jurisdictions.

Worthless or lost crypto can be claimed as a “negligible value claim” under specific HMRC rules. You need to demonstrate the asset has effectively zero value with no reasonable prospect of recovery. This applies to rugpulls, bankrupt platforms, and clearly abandoned projects. The claim requires documentation.

The HMRC enforcement environment

HMRC launched a “nudge letter” campaign in 2022 sending letters to taxpayers with known crypto activity reminding them of filing obligations. The campaign was read by many recipients as intimidating but was fundamentally a prompt to file correctly, not an audit. The letters have continued to roll out annually since.

More significantly, HMRC has obtained customer lists from major UK-reachable exchanges (Coinbase UK, Crypto.com, and others) via information requests and has been matching these against filed self-assessment returns. Mismatches trigger automated follow-up.

The Digital Disclosure Service is the path for voluntarily correcting prior-year under-reporting. Penalties are materially lower than getting caught by an enquiry. If you have meaningful unreported crypto activity in prior years, this is the route.

Practical filing workflow

Use crypto tax software. Koinly, Recap, and CoinLedger all handle UK rules including Section 104 pooling and the 30-day rule. Budget £49-199 depending on transaction volume. Free tiers work for small filers.
Connect every exchange. API where possible, CSV otherwise. Include self-custody wallet addresses; most software pulls transaction history from chain data.
Tag transfers between your own wallets. Untagged transfers get treated as disposals. This is the single most common tax-software error.
Export the capital gains report and miscellaneous income report.
Enter the totals on your self-assessment form. SA108 is the capital gains section. Miscellaneous income goes elsewhere on SA100.
Keep records for six years. HMRC can open enquiries going back six years in normal circumstances, twelve if they suspect deliberate error.

Crypto taxes US guide for US readers (and interesting comparison for anyone with split residency).
How to buy Bitcoin where record-keeping starts.
How to stake Ethereum — staking tax context in a practical workflow.
Best crypto wallets 2026 — wallet organization for record-keeping purposes.

Sources

Educational content, not personalized tax advice. UK tax situations vary by residency status, income, and activity. For significant positions, DeFi exposure, residency complications, or prior-year issues, work with a UK tax adviser familiar with cryptocurrency.

Frequently asked questions

When do I owe UK tax on crypto?

When you dispose of crypto: selling for pounds (or any fiat), trading one crypto for another, spending crypto on goods or services, or gifting crypto to anyone other than a spouse. Holding crypto does not trigger tax. Transferring between your own wallets does not trigger tax. Earning crypto as staking rewards, mining, or income also triggers tax as income at receipt.

What is the UK Capital Gains Tax allowance for crypto in 2025/26?

£3,000 for the 2025/26 tax year. Gains up to £3,000 are tax-free. Above that, the rate is 10% for basic-rate taxpayers and 20% for higher-rate taxpayers on the excess. This allowance has been cut substantially from £12,300 in 2022/23 and £6,000 in 2023/24, making record-keeping materially more important than it was a few years ago.

What's Section 104 pooling?

HMRC’s cost basis method for crypto. All purchases of the same asset (all your BTC, say) are pooled together. The pool’s cost basis is the weighted average of purchase prices. When you sell part of your BTC, the cost basis is the pool average times the amount sold. The pool continues forward with the remaining coins at the same average. This is different from FIFO used in some other jurisdictions.

Are staking rewards taxable in the UK?

Yes, as miscellaneous income at the fair market value (in GBP) on the day of receipt. You report it in the self-assessment miscellaneous income section. The received amount also becomes your cost basis for those coins going forward; when you eventually sell, you calculate capital gain or loss from that basis.

Do I need to file a self-assessment return if I only have crypto gains?

If your total capital gains exceed £3,000 for 2025/26, yes, you must file a self-assessment return and report them. If your gains are under £3,000 but your disposals exceed £50,000 in total, you also need to report (the 4x allowance rule). If neither applies, you don’t need to file specifically for crypto, though you still need to keep records in case HMRC asks.

What's the 30-day rule for crypto?

The 30-day rule (sometimes called ‘bed and breakfasting’ in the UK) says: if you sell crypto and buy back the same crypto within 30 days, HMRC treats the buyback as matched against the sale for cost basis purposes, not as a new Section 104 pool entry. This prevents deliberate loss harvesting by immediate re-buying. UK crypto does not have a separate wash-sale rule beyond this; the 30-day rule serves the equivalent function.

Is DeFi yield taxed the same as staking?

Usually yes, at the income tax level. HMRC’s DeFi guidance treats yield farming, liquidity mining, and interest on lending as miscellaneous income at receipt. The capital-vs-income distinction for DeFi is an evolving area; HMRC published expanded guidance in 2022 and has signaled more updates are coming. Conservative treatment (income at receipt) is what tax software defaults to.

Do I pay UK tax if I'm not UK-resident?

Generally no, unless the gains relate to UK-situs assets or you’re non-resident for less than five years and fall under temporary non-residence rules. If you’re UK tax-resident under the Statutory Residence Test, you owe UK tax on worldwide crypto gains regardless of where the exchange is based or where the crypto is stored. Residency determination is its own topic; talk to a tax adviser if your situation is borderline.

What happens if I don't report crypto to HMRC?

HMRC has obtained customer data from major exchanges via information requests since 2019. Penalties for undeclared crypto range from 30% of the tax owed (for careless under-reporting) to 200% (for deliberate concealment with offshore elements). HMRC launched a ’nudge letter’ campaign in 2022 and has been expanding crypto-specific enforcement since. Voluntary disclosure (the Digital Disclosure Service) reduces penalties materially vs. being caught.