Crypto Exchange Tax Report Wrong: How to Correct It Before the Tax Office Does

If your crypto exchange's tax report is wrong, you have to correct it yourself. The German tax office treats that document as an aid and not as proof. You alone are responsible for the figures in your tax return, even when the exchange made the mistake. That sounds harsh, and it has been clearly settled since the Federal Ministry of Finance's circular of March 6, 2025. Anyone buying or selling through a central trading platform run by a foreign operator has to download and retain the transaction overviews provided there, regularly and in full. Missing records and data losses expressly count against you. This piece shows how to spot a faulty report, how to correct it, and which deadline applies once the return is already with the tax office. Why an Exchange Tax Report Is Almost Never Complete A trading platform only knows what happened in its own accounts. The moment you move Bitcoin from an exchange to a wallet of your own, its field of view ends. The platform sees a withdrawal and does not know whether you sold, gave the coins away or merely relocated them. If the same coins arrive on another platform months later, that second platform sees an inflow with no acquisition cost. This...