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.
Key Takeaways
- ✓ Crypto documentation is your complete transaction history in a tax tool — the foundation for every calculation that follows
- ✓ If documentation is wrong, the tax calculation and tax return based on it are automatically wrong too
- ✓ Common gaps include missing wallets, incomplete DeFi records, forgotten exchanges, and wrong transaction classifications
- ✓ Since DAC8 (Jan 2026), exchange data is automatically reported to tax authorities and compared with your return
- ✓ Tax tools calculate gains; tax advisors prepare returns — accurate documentation is the investor's own responsibility
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.
TX-Partner is the specialist for crypto documentation in Germany and Austria — founded by experts with experience from over 500 projects, from simple staking to multi-chain and DeFi. Tax advisors work with the numbers — TX-Partner delivers the data foundation those numbers are based on.
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 Crypto Documentation Requirements 2026: Why Act Now?
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. For a full overview of how crypto is taxed in Austria – including KeSt, AVCO, and staking rules – see our complete guide to crypto taxation in Austria 2026. For Germany (holding period, FIFO, Anlage SO), see our complete guide to crypto taxation in Germany 2026.
07 How TX-Partner Implements Professional Crypto Documentation
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.
Crypto documentation is its own discipline — between tax law and tooling. TX-Partner handles the data preparation: complete transaction history, correct classifications, comprehensive DeFi coverage — prepared according to a 4-pillar standard that tools and advisors can work with directly.
This means in practice:
- 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.
Sources & References
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.
