Import from Coinbase, Binance, or Kraken in 30 seconds. Connect DeFi wallets for automatic classification. HMRC-ready reports with full working shown — Section 104 pooling, same-day matching, SA108 box mapping.
75 transactions free · From £49 per tax year · No subscriptions ever
Free · No sign-up
Paste any wallet address. We'll scan your recent transactions across Ethereum, Polygon, Arbitrum, Optimism & Base and estimate your UK CGT exposure — instantly, no account needed.
Two paths to your HMRC-ready report
Exchange trades or DeFi activity — same engine, same accuracy
Download your transaction history from Coinbase, Binance, or Kraken. Takes 30 seconds.
Upload your CSV — we auto-detect the format and classify every trade, reward, and conversion.
Paste your Ethereum, Arbitrum, Optimism, Base, or Polygon address. Read-only — no seed phrase, no permissions.
27 protocol-specific classifiers identify every interaction — swaps, LPs, staking, bridging, and more.
Same-day rule, 30-day Bed & Breakfast rule, Section 104 pooling — all applied in the correct order. Every disposal shows its working.
PDF tax report with SA108 box values pre-filled. Hand it to your accountant or file it yourself.
Most tools handle simple trades. When it gets complex, they get it wrong. ChainTax classifies everything correctly — from exchange buys to multi-leg LP positions.
| Scenario | Most crypto tax tools | ChainTax |
|---|---|---|
| Exchange buy / sell | Correct | Correct |
| Token swap (Uniswap, 1inch) | Usually correct | Correct |
| LP position (add / remove) | Often wrong — phantom gains | Correct — cost basis change |
| Staking rewards | Sometimes missed | Income at fair market value |
| Bridge transfer | Taxed as disposal | Non-taxable transfer |
| HMRC matching rules | US rules adapted | S104 + same-day + B&B |
| Show Working | Black box | Per-disposal matching rule, S104 pool, price source |
| Exchanges + DeFi combined | Separate tools or manual merge | One report — exchanges and DeFi wallets |
| Shared report links | PDF email only | Send a live link to your accountant |
| Manual entry | Limited or none | Add missing buys, sells, income |
| Split-year CGT (2024/25) | Single rate applied | Per-disposal 10%/20% or 18%/24% auto-split |
Not a US tool with a UK skin. Every rule, every classifier, every rate — built for HMRC from day one.
Import from Coinbase, Binance, or Kraken — upload your CSV or add trades manually. Every trade, reward, and conversion is classified in seconds.
27 dedicated classifiers for Uniswap, Aave, Lido, Curve, 1inch, and more. Each protocol has its own logic — not a heuristic guessing from token transfers.
Not adapted from US rules. Built ground-up for UK tax law — Section 104, same-day, B&B, split-year CGT rates, and SA108 box mapping. The report your accountant expects.
No black boxes. Every disposal shows the matching rule applied, the S104 pool snapshot, the price source, and a confidence rating. Your accountant can verify every line — or share a live report link directly.
Paste any Ethereum transaction hash and see it classified instantly. See exactly how ChainTax identifies swaps, LP positions, staking, and more.
Classify a transaction freeUnder CARF, ~50 UK crypto platforms now report your transactions directly to HMRC. The first cross-reference against your Self Assessment lands May 2027. Your 2024/25 return is the first one they'll check.
If your crypto activity is misclassified — phantom gains, missing cost basis, income counted twice — your return won't match what they already have. Get it right before you file.
Check your tax exposure freePay once, download your report. No subscriptions, no per-transaction fees.
500 transactions
Exchange trades, staking, a few swaps
2,000 transactions
Active across exchanges and DeFi
No transaction cap
Power users and multi-wallet portfolios
An accountant charges £300+ to classify 50 crypto transactions manually.
Each wallet sync processes up to 5,000 transactions. Multiple wallets supported.
Import your exchange trades or connect your DeFi wallets. See exactly how everything is classified. Pay only when you download the report.
Get started free