Disclaimer: The information in this article provides a general overview and does not claim to be exhaustive. It cannot replace a detailed, individual consultation. TX-Partner assumes no liability for the accuracy, timeliness, or completeness of this information.
Since January 2026, DAC8 is active. Crypto exchanges report transactions to tax authorities. But that's not the real question. The real question is: Is your crypto documentation correct?
01 What is Crypto Documentation?
Crypto documentation is your transaction history in the crypto tax tool – meaning everything you've imported into Blockpit, CoinTracking, or another tool:
- On-Chain Transactions – Wallet activities, DeFi interactions, NFTs, bridges
- Exchange Transactions – Trades on Binance, Kraken, Coinbase and other platforms
- Other Activities – Staking rewards, airdrops, mining income
All of this, collected in one place in your crypto tax tool, is your crypto documentation. Every further calculation is based on it.
02 The Order is Critical
For crypto taxes and compliance, there is ideally a clear order:
The 3-Stage Logic
Crypto Documentation
Complete transaction history in the tool
Tax Calculation
What the tool or tax advisor makes of it
Compliance
DAC8 reports, tax authority, tax return
Each step builds on the previous one.
This sounds obvious. But in practice, it's often overlooked.
03 What Happens When Crypto Documentation is Incorrect
Imagine your crypto tax tool shows 300,000 euros in profit, even though you can rule out having reached that amount.
This is probably not a bug in the tool.
The problem: The crypto documentation is incomplete or incorrect. The tool sees sales without cost basis or incorrectly accounts for transfers as sales. So it calculates profits that never existed.
The consequences:
- Wrong tax calculation – the tool calculates with wrong numbers
- Wrong tax return – your tax advisor works with what they receive
- Compliance problems – DAC8 reports X, you declare Y, the tax authority sees discrepancies
04 Who is Responsible for What?
This is the question many don't ask:
Crypto tax tools track your activity and calculate gains & losses. They're usually good at it – as long as the data is correct.
Tax advisors advise on tax law and prepare tax returns. They work with the data they receive.
Crypto documentation? TX-Partner specializes in crypto documentation.
In practice, it's often difficult to verify the completeness of all wallets and DeFi activities yourself – especially with complex portfolios.
Your crypto documentation is your responsibility. TX-Partner helps you meet this responsibility.
05 What "Incomplete Crypto Documentation" Actually Means
In practice, we see these problems:
Common Documentation Gaps
Missing Wallets
You have 9 wallets, but only imported 7. The transactions from the other 2 are completely missing.
Incomplete DeFi Documentation
Liquidity mining, staking, bridges – many protocols are not fully recognized by tools.
Forgotten Exchanges
You bought on an exchange in 2021 that no longer exists. The data is missing.
Wrong Classifications
An airdrop was recorded as income.
06 Why This Is More Important Than Ever
With DAC8, crypto transactions are automatically reported to tax authorities. The tax authority receives structured data from exchanges.
Source: EU Official Journal, Directive (EU) 2023/2226
This data is compared with your tax return.
If discrepancies appear, inquiries can arise. In this case, comprehensive, verifiable crypto documentation is the best preparation.
07 What TX-Partner Does
TX-Partner doesn't calculate taxes. That's what crypto tax tools do.
TX-Partner doesn't provide tax advice. That's what tax advisors do.
TX-Partner ensures correct crypto documentation.
This means:
- Capturing all wallets and exchanges
- Fully documenting DeFi activities
- Reconstructing missing transactions
- Preparing data according to the 4-Pillar Standard, so tools and advisors can work with it
08 The Next Step
Unsure whether your crypto documentation is complete?
TX-Partner analyzes your crypto history in a 30-minute consultation. No obligations – just clarity about where you stand.
Frequently Asked Questions About Crypto Documentation
What is crypto documentation?
Crypto documentation is the complete, traceable preparation of your transaction history – all purchases, sales, transfers, DeFi activities and more. It is the foundation for every tax calculation and compliance audit.
Why isn't a crypto tax tool enough?
Crypto tax tools like Blockpit or CoinTracking calculate well – but only based on the data you import. If wallets are missing, DeFi isn't recognized, or transactions are misclassified, the calculations are also wrong.
What is DAC8?
DAC8 (Directive on Administrative Cooperation 8) is the EU directive that has required crypto exchanges since January 2026 to automatically report transaction data to tax authorities. The tax authority receives structured data and compares it with your tax return.
What happens with DAC8 if my documentation is incorrect?
DAC8 means exchanges automatically report to tax authorities. If these reports don't match your tax return, there may be inquiries. Then you need evidence and comprehensive crypto documentation.
Can TX-Partner help with any crypto documentation?
TX-Partner specializes in complex crypto histories – especially when there are DeFi activities, multi-chain transactions, or error messages in Blockpit/CoinTracking.
Unsure whether your crypto documentation is complete?
TX-Partner analyzes your crypto history in a non-binding 30-minute consultation. Just clarity about where you stand.
Non-Binding Documentation CheckFurther Information
Co-Founder & Documentation Specialist
Robert Thorn is Co-Founder of TX-Partner, specializing in complex crypto documentation for tax advisors and private investors in Austria and Germany.