Bitcoin Tax Report Wrong: What Austrian Investors Can Do

Bitcoin Tax Report Wrong: What Austrian Investors Must Correct

For income from 2025 onwards, Austrian investors can request standardised tax reporting from certain parties obliged to withhold Austrian capital gains tax (KESt). The document is meant to make crypto income, and the capital gains tax attributable to it, traceable.

Even so, the report should not be adopted without checking it. Incorrect acquisition costs, transfers from external wallets or incomplete tax data can all mean that the Bitcoin gain shown does not match the actual tax position.

Bitcoin Held Outside the Provider Is the Critical Case

Problems arise above all where Bitcoin was originally bought outside the Austrian provider.

In that case the crypto service provider may not automatically know:

• the actual acquisition costs,
• the original purchase date,
• earlier crypto-to-crypto swaps,
• whether the coins count as old or new holdings.

Where data required for the capital gains tax deduction is missing, statutory flat-rate valuation rules can apply.

Which Tax Report Entries Investors Should Check

In the tax report, and in the underlying exchange data, the following in particular should be checked:

• taxable gains,
• realised losses,
• capital gains tax withheld,
• the acquisition costs applied,
• the allocation of wallet transfers,
• the treatment of old holdings,
• loss offsetting.

An Error in the Tax Report Can Mean Too Much Tax

An example:

• actual acquisition costs: 30,000 euros
• sale: 50,000 euros
• actual gain: 20,000 euros

If the provider instead applies only 20,000 euros as the acquisition costs, it would report a gain of 30,000 euros.

At 27.5 percent, considerably more tax would initially have been accounted for than was actually owed.

Discrepancies of that kind should not simply be accepted.

Correction Through the Provider or the Tax Assessment

Depending on the error and on the timing, a correction by the crypto service provider may be possible first. Where acquisition data is substantiated after the event, corrections to the capital gains tax deduction can be possible.

If a correction through the provider is no longer available, an income tax assessment may become necessary.

Your Own Records Remain Essential

Standardised tax reporting therefore does not replace your own crypto documentation.

You should keep in particular:

• the original purchase statements,
• CSV exports,
• bank transfers,
• wallet addresses,
• transaction IDs,
• evidence of self-transfers,
• historical tax reports.

The more complex the history, the more important a comparison between the report and your own data becomes.

Conclusion

An Austrian Bitcoin tax report is a valuable aid, but it is no guarantee that every historical figure is correct. Above all with Bitcoin transferred in from elsewhere, older holdings and missing acquisition costs, investors should check which values the provider has actually used. If the capital gains tax deduction is wrong as a result, a correction through the provider or through the income tax assessment may be necessary.

(As of September 1, 2026. This article is not investment advice. Prices and fee structures change; check the terms with the provider before you buy.)