HMRC treats crypto as a CGT asset, not a currency. Every disposal — sale, swap, spend, gift to anyone other than your spouse — is a taxable event. With HMRC now receiving data directly from major exchanges and the £3,000 CGT annual exempt amount down from £12,300, even casual crypto holders need to file. Here's the complete 2026/27 picture and the four decisions that minimise the tax bill.
For a UK crypto investor in 2026/27: every swap, sale, spend or gift (except to spouse) is a CGT disposal. Annual exempt amount is £3,000; rates are 18% basic-rate / 24% higher-rate. HMRC uses Section 104 share pooling — average cost basis across all units of the same coin. Staking, lending and airdrops are usually income tax at marginal rate, not CGT. HMRC has data-sharing agreements with Coinbase, Binance, Kraken and most major exchanges — undeclared crypto activity is now high-risk.
The HMRC framework for crypto
HMRC's Cryptoassets Manual treats crypto as a CGT asset rather than a currency or commodity. The framework hasn't changed since the original 2018 guidance, but enforcement has intensified dramatically — HMRC has gone from issuing "nudge letters" (2019-2022) to active investigations (2024+).
Activity
Tax treatment
Rate (2026/27)
Buy crypto with GBP
No tax event (cost basis recorded)
—
Sell crypto for GBP
CGT disposal
18% / 24%
Swap BTC → ETH
CGT disposal of BTC
18% / 24%
Pay for goods/services with crypto
CGT disposal
18% / 24%
Send crypto to spouse
No tax event (no gain/loss)
—
Gift crypto to anyone else
CGT disposal at market value
18% / 24%
Staking rewards
Income tax on value at receipt
20% / 40% / 45%
DeFi lending interest
Income tax on value at receipt
20% / 40% / 45%
Airdrops (received passively)
Income tax usually
20% / 40% / 45%
Mining
Trading or miscellaneous income
Self-employment rules
Section 104 share pooling — the rule everyone gets wrong
UK crypto CGT uses Section 104 pooling: all units of the same crypto bought across all your accounts and exchanges go into a single pool with an averaged cost basis. You don't use FIFO, LIFO, or per-transaction matching — you use the pool.
Worked example: building a BTC pool Jan 2024: bought 0.5 BTC for £20,000 Jul 2024: bought 0.5 BTC for £30,000 Pool: 1 BTC at average cost £50,000 Feb 2026: sold 0.3 BTC for £18,000 Cost basis of disposal: 0.3 × £50,000 = £15,000 Gain: £18,000 − £15,000 = £3,000 Remaining pool: 0.7 BTC at £35,000 cost
Two override rules apply before the pool kicks in: same-day rule (any buys and sells on the same day match first) and 30-day "bed and breakfasting" rule (a buy within 30 days after a sell matches to that sell). After both apply, the rest go into Section 104.
The £3,000 AEA — why even small investors must file
The → £6,000 (2023/24) → £3 has been cut dramatically: £12,300 (2022/23) → £6,000 (2023/24) → £3,000 (2024/25 onwards). At 2026/27 levels, even a modest crypto investor with £20,000-50,000 invested can trigger filing requirements with a single 10-20% gain realisation.
Worked example: small crypto portfolio at 25% gain £15,000 invested, sold for £18,750 = £3,750 gain Less £3,000 AEA = £750 taxable At 18% basic-rate = £135 CGT BUT — you must still file a Self Assessment return for this £135. Failing to file is a £100 penalty plus escalating fines.
Importantly, you also need to file if your total proceeds exceed 4x the AEA (£12,000 in 2024/25 onwards) EVEN IF the gain is under £3,000. So a year of active trading with £20,000+ of disposals requires reporting regardless of net gain.
The four decisions worth making
Crystallise gains every year using the £3,000 AEA. Sell £3,000 of gains each tax year and rebuy if you still want the position. This locks in tax-free gains and uses an allowance that doesn't carry forward. Be aware of the 30-day rule — buy in a different but correlated asset, or wait 31 days.
Use ISA wrapper indirectly via Bitcoin/crypto ETPs. Direct crypto can't be held in an ISA, but UK-listed Bitcoin and Ethereum ETPs (from issuers like WisdomTree, 21Shares) became ISA-eligible from October 2024. These give CGT-free and dividend-tax-free crypto exposure. Annual ISA allowance £20,000.
Track every transaction in real time with a crypto tax tool. Manual tracking across multiple exchanges and wallets is essentially impossible for active traders. Koinly, CoinTracker, Recap and similar tools (£50-200/year) export HMRC-formatted reports. Worth every penny.
Don't assume small/old activity is invisible. HMRC has data-sharing agreements with Coinbase, Binance, Kraken, Bitstamp, Gemini and most major UK-accessible exchanges. They receive customer data automatically. Nudge letters from HMRC's cryptoassets unit have increased 5x year-on-year since 2023.
Common mistakes that trigger HMRC investigation
Treating crypto-to-crypto swaps as "not real" disposals. Every swap is a UK CGT event regardless of whether GBP touched the trade.
Forgetting that staking income is taxed at receipt. If you receive 0.1 ETH worth £200 in staking rewards, that's £200 of income tax in the year of receipt. The £200 also becomes the cost basis for that 0.1 ETH for future CGT calculation.
Mixing personal and "trading" activity. HMRC normally treats individuals as investors (CGT applies). Frequent day-trading at large scale can be reclassified as a trade (income tax + Class 4 NI applies). The line is fuzzy and HMRC tends to argue for whichever produces more tax.
NFTs treated as non-taxable collectibles. NFTs are CGT assets like any other crypto. Profit on a flip is CGT; receiving an NFT airdrop is income tax.
Lost-key losses unreported. Crypto irretrievably lost (e.g. forgotten seed phrase) can be claimed as a Negligible Value claim, locking in a capital loss for future offset. Most don't bother and lose the relief.
Sources and methodology
Crypto framework from HMRC Cryptoassets Manual. CGT rates from gov.uk CGT rates. Section 104 pooling rules from CRYPTO22150. Exchange data-sharing from HMRC International Exchange of Information disclosures 2023-25.
UK Tax Drag is educational and not regulated financial advice — see the disclaimer for the full position.
Four UK crypto scenarios showing how HMRC treats common situations — buying, selling, staking, and DeFi.
Lewis — bought £8,000 BTC in 2021, sold £14,000 in 2026
Situation: No other crypto activity, only one buy and one sell.
Question: What's the CGT?
What to do: Capital gain = £14,000 - £8,000 = £6,000. £3,000 annual exempt amount applied. Taxable gain: £3,000. As basic-rate taxpayer (total income < £50,270 including the gain): 18% × £3,000 = £540 CGT. Reported via Self Assessment by 31 January 2027 for the 2025/26 tax year if disposed in that year. Disposal proceeds £14,000 below £50k SA reporting threshold but still required if any taxable gain.
Sophie — ETH staking yield
Situation: Holds 4 ETH, earned 0.16 ETH in staking rewards over the year (worth ~£480 in GBP at receipt).
Question: How are staking rewards taxed?
What to do: Staking rewards = miscellaneous income at marginal rate, taxed at GBP value on the day received. £480 added to her £42,000 salary = additional £96 tax (20%). When she later sells those 0.16 ETH, CGT applies on the gain from the £480 cost basis to sale price. Two tax events: income at receipt, capital gain at disposal. Self Assessment required.
Marcus — DeFi yield farming + liquidity providing
Situation: Provides £12,000 to a Uniswap LP earning $1,800 in fees, then withdraws.
Question: How does HMRC treat this?
What to do: HMRC guidance treats LP entry as a DISPOSAL of the deposited tokens at market value — triggers CGT on the deposit. Fees earned over time = miscellaneous income. Withdrawal = ACQUISITION of new tokens at then-market value. Marcus has 3 separate taxable events: CGT on entry (vs original cost basis), income tax on fees, CGT on exit (vs LP-entry basis). Software like Recap or Koinly handles this — manual tracking is impossibly complex.
Aisha — sold crypto at a loss
Situation: £15,000 worth of altcoins bought 2022, sold for £4,500 in 2026.
Question: How does the loss help?
What to do: Allowable capital loss = £10,500. Loss can offset gains in the SAME tax year first, then carry forward indefinitely against future gains. Loss must be CLAIMED on Self Assessment within 4 years to be available — otherwise lost permanently. Particularly valuable if she also has stock gains she could realise against the crypto loss.
Scenarios use 2026/27 UK tax-year rates. Personas are illustrative — verify your own situation against current HMRC guidance.
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