UK Crypto Tax 2026/27: HMRC Rules, Section 104 and CoinTracker Records

UK crypto tax is not triggered only when cryptocurrency is converted to pounds. Selling, swapping, spending and most gifts can be Capital Gains Tax disposals, while mining, staking, employment and other receipts may create taxable income. This guide explains the rules relevant to many individual investors for 2025/26 and 2026/27, how HMRC’s matching rules work and how CoinTracker records can support a Self Assessment calculation.

Last reviewed: September 5, 2026. This independent article provides general educational information for UK individuals, not tax, accounting or legal advice. Rules differ for companies, trusts, traders, non-UK residents and unusual DeFi arrangements. Confirm current rates, forms and treatment with HMRC and a qualified UK tax adviser.

UK crypto tax 2026/27: quick answer

Buying crypto with GBP and holding it do not normally create a taxable disposal. Moving the same asset between wallets you beneficially own ordinarily does not create one either. Selling for pounds, exchanging tokens, spending crypto and making most gifts are disposals that require a gain or loss calculation.

Crypto received through employment, services, ordinary mining or staking may be taxable as income when received. Selling or swapping it later is a separate Capital Gains Tax event, so retain both the sterling receipt value and later disposal record.

Tax years and important filing dates

The UK tax year runs from 6 April to the following 5 April. Activity from 6 April 2025 through 5 April 2026 belongs to 2025/26; activity beginning 6 April 2026 belongs to 2026/27. Do not calculate by calendar year merely because an exchange export does.

Other dates can apply to registration, real-time CGT reporting and payments on account. Check the route relevant to the complete tax position.

Which crypto transactions are taxable?

An exchange label is not decisive. A “send” could be an own-wallet transfer, payment or gift. Classify the facts and retain evidence of the destination owner.

Capital Gains Tax rates and allowance

A simplified gain begins with sterling disposal proceeds minus allowable matched cost. For 2025/26, the annual exempt amount for most individuals is £3,000. Current general CGT rates applicable to many crypto gains are 18% for the portion falling within an unused basic-rate band and 24% above it. Income, losses, reliefs and personal circumstances affect the result. The allowance applies across eligible gains, not separately to each token.

HMRC matching order for fungible tokens

UK rules do not normally let an investor select whichever BTC purchase produces the preferred result. HMRC applies this order:

1. acquisitions of the same asset made on the disposal day;
2. relevant acquisitions in the following 30 days;
3. the remaining quantity in the Section 104 pool.

CoinTracker must use the correct UK profile and complete activity. A US FIFO report is not a substitute for UK pooling.

How a Section 104 crypto pool works

A Section 104 pool combines eligible holdings of the same fungible asset into a pooled quantity and pooled allowable cost. The average cost changes as acquisitions enter the pool. When part is sold, a proportionate part of pooled cost is allocated.

For example, 2 ETH with pooled cost of £3,000 has an average pooled cost of £1,500 per ETH. Ignoring same-day and 30-day matches, disposing of 0.5 ETH allocates £750 of pooled cost. The remaining pool contains 1.5 ETH and £2,250 of cost.

The same-day and 30-day rules

Units acquired and disposed of on the same day are matched before the pool. After that, a disposal can match acquisitions of the same asset during the following 30 days. This “bed and breakfasting” rule means selling and quickly rebuying may not create the loss expected from pooled cost.

Because the rule looks forward, a year-end calculation may need transactions after the disposal and even after 5 April. Preserve timestamps and apply the UK tax date consistently when exchanges export in UTC.

Crypto income and later gains

Crypto received for employment or services may be employment or trading income. Ordinary non-trading mining and staking receipts may fall within miscellaneous income rules. A DeFi return can require closer analysis of the arrangement rather than relying on the word “reward.”

Record the quantity, receipt time and sterling market value. If the receipt is taxable income, that value is also relevant to acquisition cost. A later sale, swap or spend can produce a separate capital gain or loss.

Stablecoins, crypto cards and fees

Exchanging BTC for USDC is still normally a disposal; a token designed to track fiat is not automatically fiat cash. Spending through a crypto card can create disposals when assets are converted to fund purchases. A fee paid in crypto may itself involve a disposal. Import fees separately and do not claim the same cost twice.

Own-wallet transfers and missing cost

Transfers between wallets owned by the same person ordinarily do not change beneficial ownership. However, both sides must be traceable. If only the final exchange is connected, CoinTracker may see a deposit with no original acquisition and report missing cost history.

Import the sending account, intermediate wallet and destination. Match asset, amount, time and transaction hash while allowing for network fees. Never label a payment or gift as an internal transfer merely to remove a gain.

DeFi, liquidity pools and wrapped assets

Supplying liquidity, receiving a pool token, wrapping, bridging or lending may change assets, rights or beneficial ownership. Import every leg and retain protocol documents, token contracts and valuation evidence. Proposed future rules should not be applied to an earlier tax year as if already in force.

How to prepare UK records with CoinTracker

1. Select the UK profile: confirm country, GBP, time zone and tax year.
2. Add every source: exchanges, public addresses, older wallets, NFT markets and DeFi protocols.
3. Import complete history: earlier purchases determine current pooled cost.
4. Reconcile balances: compare counts and closing quantities with source statements.
5. Match transfers: connect withdrawals and deposits without hiding payments or gifts.
6. Resolve warnings: investigate missing purchases, duplicates and negative balances.
7. Review income: check mining, staking, employment and service receipts.
8. Verify large values: retain the source and sterling valuation method.
9. Generate a UK report: compare it with current Self Assessment instructions.
10. Archive everything: save reports, raw exports, settings and manual-edit notes.

Use public addresses, read-only API access or official exports. Tax software never needs a seed phrase, private key or withdrawal permission.

Self Assessment and SA108 Cryptoassets

SA100 is the main Self Assessment return. For 2025/26, SA108 Capital Gains Summary contains a dedicated Cryptoassets section. A supporting calculation remains necessary even when every transaction is not entered individually on the return.

CoinTracker can organise activity and produce UK-focused calculations, but users must review completeness and determine which claims, elections and return sections apply. Compare output with the current SA108 form and notes.

CARF reporting from 2026

The UK Crypto-Asset Reporting Framework increases information collection by reporting cryptoasset service providers for activity beginning in 2026. Provider reporting does not reconstruct every private wallet, apply all matching rules or calculate a complete tax return. Taxpayers still need unified records across platforms.

UK crypto tax recordkeeping checklist

• Original exchange statements and CSV files.
• Wallet addresses and transaction hashes.
• Bank evidence for GBP deposits and withdrawals.
• Sterling values and pricing sources.
• Mining, staking and employment receipt histories.
• Section 104 calculations and same-day or 30-day matches.
• Gift, donation and loss documentation.
• The filed return, CoinTracker report and correction log.

Keep source exports unchanged and work from copies. A live dashboard is not a durable archive because imported data and classifications can later change.

Common mistakes

• Ignoring swaps because no GBP was received.
• Using FIFO instead of UK matching rules.
• Calculating by calendar year.
• Ignoring purchases within 30 days after a sale.
• Importing only the selling exchange.
• Treating every deposit as income.
• Forgetting the later disposal of tokens previously taxed as income.
• Assuming stablecoin swaps and card spending are not disposals.
• Relying on software without resolving warnings.

Frequently asked questions

Do I owe UK tax without cashing out?

Potentially. Swaps, spending and most gifts can be disposals even when no pounds enter a bank account.

Are transfers between my wallets taxable?

Ordinarily not if beneficial ownership and the asset remain unchanged. Fees and transactions involving a new token or right need separate review.

Can I choose the purchase with the highest cost?

Not freely. Same-day, 30-day and Section 104 rules determine the match for fungible assets.

Does the £3,000 allowance cover crypto income?

No. It relates to eligible capital gains, not employment or miscellaneous income.

Does CoinTracker file Self Assessment?

It can organise activity and generate UK tax reports, but the taxpayer must review them and complete the applicable filing process.

Final takeaway

UK crypto tax depends on complete records and statutory matching, not an exchange’s profit figure. Separate income from later disposals, calculate in sterling, apply same-day and 30-day matches before the Section 104 pool, and retain evidence across every wallet.

Review CoinTracker’s UK crypto tax guide and UK product information. For authoritative rules, consult HMRC’s guidance on Section 104 pooling, its pooling examples, and the current SA108 form and notes.