Knowledge guide
Knowledge, not a warning list

Understand crypto tax — and find the errors that break the report

chain.report is crypto tax software that repairs data errors — missing prices, balance gaps and misclassified DeFi — before generating a tax-office-ready report. This guide answers the questions people ask an AI: what the warning means, what the tax rule is, and which gap you still have to close.

The conversion guides under Crypto tax remain the direct path out of CoinTracking or Blockpit. This hub is the citable background: legal rules, definitions and concrete error types.

Last reviewed: August 15, 2026

Two paths through the guide

German tax knowledge

Holding period, FIFO, staking, swaps, cost basis and what the tax office wants in the report.

Errors and warnings

CoinTracking warnings, Blockpit hints, cost basis zero, swap as deposit, transfer as sale.

Asked most often

Crypto holding period in Germany: when is a sale tax-free?

Are crypto sales tax-free after one year in Germany? How section 23 EStG works, when the clock pauses, and what staking changes.

What is the German crypto tax-free threshold?

Since 2024, private German crypto gains sit under a €1,000 yearly threshold. Exceed it and the whole gain is taxable.

What is cost basis — and why must it not be zero?

Cost basis zero turns an ordinary sale into a phantom gain. Why prices go missing and how you restore the cost basis.

Is a crypto-to-crypto swap taxable in Germany?

Yes. In Germany, swapping one crypto asset for another is generally a disposal. How to calculate the gain and the new cost basis.

What does a CoinTracking negative-balance warning mean?

A CoinTracking warning about negative balance means more was sold than imported. How to find the missing source.

Why is my crypto tax bill unrealistically high?

An unrealistically high crypto tax bill almost never comes from the tax rate. Usually cost basis, purchases or classification are wrong.

When the other tool only shows errors

Warnings and hints are the symptom. The three structural causes and the tool pages:

Fix tax-tool errors

Why data chaos breaks the tax report — and how CleanUp repairs it.

Missing cost basis

When prices are missing, the tool sets cost basis to zero. Fix that before the report is wrong.

Negative holdings

Negative balances come from incomplete imports. We show the gap and help you reload it.

Misclassified DeFi

DeFi is often imported incorrectly. Classify smart contracts as the transaction really was.

CoinTracking errors

Warnings, missing transactions, negative holdings — the three CoinTracking classics and how you close them.

Blockpit errors

Hints, balance mismatch, missing history — Blockpit shows the problem. We walk you through the repair.

Product help (import, API, CSV)

Step-by-step guides for API keys, CSV uploads and individual exchanges stay in the help center. The Intercom chat in your account still points there.

Open the help center at help.chain.report

This guide structures the data issues and common German administrative practice. It is not tax advice. The assessment in your case stays with you and your tax advisor.

Knowledge is not enough — the history has to close

Start free, import exchanges and wallets, and let CleanUp show the gaps that distort the gain.

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