Crypto tax · 🇩🇰 Denmark · 🇬🇷 Greece
Know what you owe on your crypto — before you sell.
Chainbook reads your exchange exports and wallets, follows every coin from purchase to sale, and shows your gains the way the tax office expects them.
Your data stays with you
The full ledger lives in your browser. Cloud backup is optional and only you can read it.
Every source, one ledger
Coinbase, Coinbase Pro, Crypto.com, Nexo, Bitcoin addresses and wallet files — with transfers between your own accounts matched automatically.
Ready for your accountant
A password-protected link with year-end balances, open questions, PDF and Excel — plus the exact numbers to copy into the tax return.
Local-first privacy. Nothing stored on our servers by default.
Your transactions, balances and gains are calculated and saved in your own browser. No account is needed to use Chainbook.
Stored on your device
Imports and the full ledger are kept locally in your browser — not in our database.
Price lookups without your portfolio
When we fetch prices, only coin symbols and dates are sent — never amounts, balances or gains.
Cloud only if you choose it
Backup, sync across devices and accountant links are opt-in. Turn them off and your data stays local.
Bitcoin address scans send the public addresses you add to look up their history on the blockchain.
🇩🇰 Danmark
- FIFO cost basis in DKK with daily exchange rates
- Rubrik 20 for gains and income, Rubrik 58 for losses
- Ready-to-paste numbers for TastSelv
🇬🇷 Ελλάδα
- FIFO capital gains in EUR at a 15% rate
- Annual gains and losses offset each other
- E1 codes 865/866 and 867/868