UK Bitcoin tax calculator · SA108-ready
Your Bitcoin,
tax-ready.
Upload your Coinbase or Kraken CSV. See your UK capital gains calculation before paying, then download an accountant-ready PDF and CSV for £19 — once, with no subscription.
Calculated locally before payment · No wallet connection · No API keys
Private by design
Your CSV is parsed in your browser before checkout.
No account access
We never ask for exchange passwords, wallet access or API keys.
Pay only when ready
Review the calculation first. Pay only to download the files.
What you get
SA108-ready report
Section 104 share pooling. Same-day and 30-day matching rules. CSV + PDF you can hand straight to your accountant or paste into HMRC.
CARF-aware
CARF reporting began on 1 January 2026, giving HMRC greater visibility of crypto activity. Stackprint helps you prepare clear records; individuals do not file a CARF report.
Built for stackers
Bitcoin-first. Built by a UK developer who actually stacks. No altcoin clutter, no token gimmicks, no "Web3" anything.
Financial data deserves plain answers.
Stackprint explains what it reads, what it calculates and where its limits are. If acquisition history is missing, we flag it and prevent checkout rather than sell you a report we know is incomplete.
When does data leave my browser?
Parsing and the initial calculation happen on your device. Transaction records are sent only when you choose secure checkout.
Does Stackprint connect to my exchange?
No. You upload a read-only export; Stackprint never requests login details or trading permission.
Can I use data from only one exchange?
Only if it contains your complete acquisition history. Transfers and purchases elsewhere can change the cost basis.
Is this tax advice?
No. It is calculation software based on published UK matching rules. Complex circumstances should be reviewed by a UK tax adviser.
Honest pricing
Early-access pricing while Stackprint is in beta.
- ✓One UK tax year (2025/26 or earlier)
- ✓Unlimited Coinbase & Kraken CSVs
- ✓SA108 cryptoasset boxes mapped
- ✓Section 104 pool + matching rules
- ✓CSV + PDF download
- ✓Email receipt for your records