Your crypto Capital Gains Tax, worked out in seconds — before you pay a penny.
Drop your exchange CSV and see your full HMRC figure on screen — free, no sign-up, no API keys. You only pay when you download the report.
Drop your exchange CSV here
Binance, Coinbase, Kraken — or any file via quick column mapping.
or browse filesThree steps. Your number is free.
No account to see it, no exchange logins, no waiting room. Upload, read your figure, and pay only if you choose to download.
Drop your CSV
Export from Binance, Coinbase, Kraken — or hand us any file and map the columns in seconds. Add as many as you trade on.
Your full figure, on screen
Proceeds, net gain and estimated CGT — with the Section 104 working shown. Up to 2,000 transactions, no charge.
Your SA108-ready report
Box-by-box figures, a PDF, and the full CSV audit trail — ready to file or hand to your accountant.
£49 per tax yearWe deliberately work from CSV files, not API connections. We never ask for exchange logins or read/write keys — so there's nothing that could leak, and nothing that could ever move your funds. Your keys stay yours.
We show our working.
No black box. Every figure is built from your trades under HMRC's three matching rules — the same logic, in the same order, as HMRC's own worked examples. You can check it line by line before you file.
An information tool, not tax advice. Review the figures — and your personal circumstances — before you file. CGT is estimated at the current higher rate (24% for 2024/25 onward; lower for earlier years) — your actual rate depends on your income.
Same-day rule
Disposals match first to acquisitions of the same asset on the same day.
30-day rule (bed & breakfast)
Then to any re-acquisition within the following 30 days, earliest first.
Section 104 pooling
Everything else draws from the pooled average cost of your remaining holding.
Matches HMRC worked examples
Run against HMRC's published examples — figures reconcile to the penny.
The number you file stays the number you filed.
When you download your SA108, we save a stamped, dated copy of those exact figures — locked. A later import can never silently rewrite what you already filed. If anything changes, we show you side-by-side so you can decide on an amendment.
Built differently on purpose.
Instant, no wall
See your full number before you ever make an account. No sign-up gate, no paywall to peek.
CSV-only
No API keys, no exchange logins. Your keys and funds are never exposed to us.
UK-built, SA108-ready
Made for HMRC Self Assessment — box numbers ready to copy, not generic exports.
Transparent pricing
Free to see it, one honest fee to download. No tiers that punish active traders.
Free to see it. £49 to file it.
See your complete number on screen for nothing. Pay only when you want the SA108-ready report to download.
Your full Capital Gains Tax figure on screen, with the working shown.
- Full proceeds, gains & estimated CGT
- Section 104 working, on screen
- Up to 2,000 transactions
- No account required
Everything in Free, plus the downloadable report you actually file.
- SA108-ready PDF, box by box
- Full CSV audit trail
- Same-day & 30-day matching detail
- Locked, dated copy of every report you file
- One flat fee, any number of trades
Prices per tax year, VAT included. Comparison tools (Koinly, CoinTracker) often require a paid plan before showing any figure — here the number is always free to see first.
The questions everyone has.
Is it accurate?
Yes — every figure is computed under HMRC's same-day, 30-day and Section 104 pooling rules, in the order HMRC applies them, and reconciled against HMRC's own published worked examples. You can open the working and check each disposal line by line.
Is my data safe? Do I need to connect anything?
No connections, ever. We work from a CSV file you upload — never API keys or exchange logins. There's no access that could move your funds, and you can compute your number without creating an account.
Which exchanges do you support?
Direct CSV formats for Binance, Coinbase, Kraken and more. For anything else, drop the file and map the columns in a few seconds — if it lists your trades, we can read it.
What exactly do I get for £49?
The downloadable, SA108-ready report: a PDF with your figures laid out box by box for Self Assessment, plus the full CSV audit trail behind every number. One flat fee of £49 per tax year, whatever your trade count, with every prior year included.
What if my numbers change after I file?
When you download your SA108, we save a stamped, dated copy of those exact figures — locked, so a later import can never silently rewrite what you already filed. If your data does change afterwards, we show you the difference clearly, side by side, so you can decide whether to file an amendment. You always keep a provable record of the version you filed.
Is this tax advice?
No. CryptoCGT is an information tool that computes your figures — it isn't tax advice. Review the numbers and your own circumstances before you file, and speak to an accountant if your situation is complex.
See your number in seconds.
Drop your CSV, read your full Capital Gains Tax figure free, and pay only if you download. No sign-up, no API keys.