How to File Crypto Taxes in United Kingdom
How to file crypto taxes in United Kingdom for the 2026 year: HMRC guidance, Self-Assessment SA100 + SA108 (capital gains), treatment of staking and DeFi, common errors, and recommended tools.
What you'll need (prerequisites)
- Complete transaction history from every exchange and wallet
- Crypto tax software (Koinly, CoinTracker, or similar)
- United Kingdom tax-residency status confirmed
- Most recent annual statements from each platform
Recommended for this tutorial
Tools and accounts referenced in the steps below:
Step-by-step
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Step 1: Aggregate all transactions
Pull CSV exports from every exchange you used (Coinbase, Kraken, Binance, etc.) and add wallet addresses for on-chain activity. Coverage is everything — even a single missing trade can cascade into wrong cost basis for every subsequent disposal.
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Step 2: Import into crypto tax software
Koinly, CoinTracker, CoinLedger, Accointing and ZenLedger all support United Kingdom. Import the CSVs and link the wallet addresses. The software auto-classifies trades, transfers, swaps, staking rewards, and airdrops.
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Step 3: Reconcile mis-tagged transactions
Most software gets 80% right but flags ambiguous events: cross-platform transfers (which look like sales), bridge events, LP token mints, and rebasing tokens. Review each warning and correct the classification.
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Step 4: Apply the correct method and jurisdiction
In United Kingdom, gains are reported as capital gains above the £3,000 annual exempt amount (2025/26). Choose the cost-basis method (pooled / share-pooling per HMRC) and apply consistently.
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Step 5: Generate the tax report
Export the United Kingdom-specific tax report (capital-gains schedule + income-events list). Most software outputs a PDF and the relevant HMRC format.
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Step 6: File with HMRC
Attach the report to Self-Assessment SA100 + SA108 (capital gains) and submit through your normal annual filing channel. Keep all underlying CSVs and software outputs for 5 years 10 months after the tax year in case of audit.
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Step 7: Pay any tax owed
Plan for the cash impact — capital gains can hit hard if you traded but never withdrew to fiat. Set money aside as you trade so the bill doesn't catch you short at the filing deadline.
Common errors and fixes
- Missing exchange exports for a defunct platform. Use blockchain explorers to reconstruct the missing transactions. If unrecoverable, document the gap and use reasonable basis estimates with disclosure.
- Transfer between own wallets flagged as a sale. Tag both sides as a "transfer" in the tax software. Most platforms auto-detect this when both addresses are linked.
- Staking rewards not picked up. Some chains (Cosmos, Solana) need wallet auto-staking to be enabled in the tool. Manually add validator rewards if missing.
- DeFi LP positions mis-priced. LP token mints and burns are often mis-tagged as trades. Use the tool's "DeFi" view to manually mark them as deposits / withdrawals (not always taxable).
- Wash-sale or bed-and-breakfast rule. HMRC's 30-day bed-and-breakfasting rule applies; the software flags it. Do not buy back the same asset within 30 days of a tax-loss disposal unless you understand the impact.
FAQ
Are crypto-to-crypto trades taxable in United Kingdom?
Yes — in nearly every jurisdiction including United Kingdom, every trade (BTC→ETH, USDT→SOL, etc.) is a taxable disposal. The software computes the gain in GBP at the time of the trade.
Is staking taxable in United Kingdom?
In most jurisdictions including United Kingdom, staking rewards are ordinary income at the moment of receipt at fair market value.
Do I need to file if I only held and never sold?
Generally no for buy-and-hold . But if you received airdrops, staking, or any income event, those are taxable even without a disposal.
What if I lost crypto to a hack or rug pull?
United Kingdom typically allows capital-loss treatment for verifiable theft and hack losses with documentation. File a police report and keep all evidence.
Recommended United Kingdom crypto tax software?
Koinly, CoinTracker, and CoinLedger all support United Kingdom. Koinly and Recap are the most HMRC-aware. Try the free tier first; pricing scales with transaction count.