Crypto Documentation

Letter from Tax Authority
About Crypto?

EU supplementary request, IRS crypto letter, or tax authority inquiry? Whether you're in Austria, Germany, or the US – TX-Partner ensures your crypto documentation is audit-ready before it reaches the authorities.

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Robert Thorn

Robert Thorn

 · Johannes Anderl

Johannes Anderl
Crypto documentation experts since 2021
DAC8 since January 2026

Crypto platforms report transaction data to authorities. Tax authorities compare this with tax returns and inquire.

0
DAC8 Reporting Duty
EU-wide data exchange active
0
EU Countries Reporting
Automatic cross-border matching
2-4
Weeks Deadline
Typical response deadline in supplementary request
EU + US
Tax Authority Inquiries
Crypto inquiries rising globally
Background

What is a Tax Authority Crypto Inquiry?

A supplementary request (Austria), information request (Germany), or IRS CP2000 notice (US) is an official inquiry from the tax authority. You are asked to provide information about your crypto activities.

The background: Tax authorities worldwide have increasingly obtained information about crypto transactions – through the EU's DAC8 reporting duty since 2026, IRS Form 1099-DA in the US, and bilateral data exchange agreements. This data is compared with tax returns and discrepancies trigger inquiries.

Good to Know

Tax authorities often request tax reports from crypto tax tools like Blockpit or CoinTracking in supplementary requests. If the report shows warnings like "Short (Warning)" or "Missing History", the tax authority sees these notices as well.

Typical Requests

What the Tax Authority Typically Requests

Tax Reports from Crypto Tax Tools

Blockpit or CoinTracking reports are explicitly mentioned. The report should show all taxable transactions.

Wallet Addresses

All wallet addresses where cryptocurrencies were held. These can be compared with blockchain data.

Exchange Exports (CSV)

CSV exports from all exchanges used. These serve to verify the tax report data.

Transaction Histories

Complete listing of all crypto transactions with date, amount, value and counterparty.

The Problem

Your Tax Report Shows Errors?

If the Blockpit or CoinTracking report shows warnings, the tax authority sees the same notices:

  • "Short (Warning)" - Sale without prior purchase
  • "Missing History" - Assets without origin
  • "Divergent Balance" - Report doesn't match wallet
  • Negative Balances - Balances in the negative

Possible consequences of a report with errors:

  • 1 Further inquiries and need for explanation
  • 2 Estimation by the tax authority
  • 3 Late filing penalties for deadline overruns
Why This is Relevant

Incomplete Crypto Documentation Can Lead to Tax Authority Problems

The tax authority reviews the tax report and it's based on the crypto documentation in the tax tool. If there are gaps there, the report shows errors. And the tax authority sees these errors.

1

Crypto Documentation

Transaction history in crypto tax tool

2

Tax Report

Submitted to tax authority

3

Tax Authority Review

Follow-up questions, estimates, late penalties

If step 1 is wrong, step 2 becomes faulty and step 3 becomes a problem.

TX-Partner Approach

Crypto Documentation, Not Tax Advice

TX-Partner is a documentation specialist, not a tax advisor. TX-Partner ensures that crypto documentation is audit-ready – before it is submitted to the tax authority.

Clean crypto documentation = Tax advisor can work.

Complete Crypto Documentation

All transactions, wallets and exchanges – processed without gaps.

Audit-Ready for Tax Authority and Tax Advisor

Report without warnings, errors or missing history.

DeFi, Bridges, Multi-Chain

Even complex scenarios that standard imports don't cover.

Tool-Agnostic

Blockpit, CoinTracking and others – TX-Partner knows the tools.

From Practice

A typical case: The tax authority sends a supplementary request regarding crypto income and a quick look at your own tax report reveals warnings, gaps, or incorrect balances. The 4-week deadline is running. What matters now: Complete, error-free crypto documentation as the foundation for your response. The cleaner the data, the smoother the communication with the tax authority.

Frequently Asked Questions

What is a tax authority crypto inquiry?

Whether it's a supplementary request (Austria), information request (Germany), IRS CP2000 notice (US), or any other tax authority inquiry – you are asked to provide information about your crypto activities. Often tax reports from crypto tax tools like Blockpit or CoinTracking are requested.

What happens if my report shows errors?

The tax authority sees the same warnings. A report with errors can lead to follow-up questions or cause the tax authority to make an estimate. Errors in crypto documentation should therefore be corrected before submission.

Comprehensive guide with action recommendations, deadlines and jurisdiction-specific differences:

To Blog Article: Tax Authority Inquires About Crypto
On the Blog

Further Articles

BLOG ARTICLE

Tax Authority Inquires About Crypto – What to Do?

Action recommendations, deadlines and jurisdiction-specific differences for tax authority inquiries.
BLOG ARTICLE

DAC8 & Crypto Documentation

What the EU reporting duty means for your crypto documentation.
BLOG ARTICLE

Crypto Documentation: Why It's Essential

Basics of clean crypto documentation for taxes and compliance.

Crypto Documentation Audit-Ready

TX-Partner analyzes your crypto documentation, identifies gaps and processes the data so your tax report passes with the tax authority.

Free Documentation Check
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