Bitcoin Sold Without Austrian Tax Withheld: What to Do Next

Bitcoin Sold Without Austrian Tax Withheld: What Investors Have to Do Next

You sold Bitcoin and the full amount landed in your account – with no 27.5 percent capital gains tax deducted. That does not automatically mean the sale was tax free. If no Austrian capital gains tax withholding agent was involved, Austrian taxpayers must generally report a taxable Bitcoin gain themselves through their income tax assessment. This applies in particular to sales through certain foreign crypto platforms, or to direct transactions with no Austrian withholding agent.

27.5 Percent Applies Even Without a Tax Deduction

The missing automatic deduction does not generally change the tax rate. Taxable private income from cryptocurrencies is generally subject to the special tax rate of 27.5 percent in Austria.

It can be collected in two ways:

• automatically, as capital gains tax,
• or through the income tax assessment.

Example:

• Bitcoin acquisition cost: 20,000 euros
• Sale: 50,000 euros
• taxable gain: 30,000 euros
• At 27.5 percent, that generally works out to 8,250 euros in tax.

The Entire Sale Proceeds Are Not Taxed

The tax is generally levied on the realised gain - not on the full 50,000 euros. What matters, therefore, are the correct acquisition costs. Where there have been several purchases, the Austrian moving average price rules can become relevant. Earlier tax-neutral crypto-to-crypto swaps also have to be taken into account, because the historical cost basis is generally carried forward.

When Do You Have to File Yourself?

An income tax return is particularly relevant where investment income is subject to the special tax rate of 27.5 percent but no Austrian capital gains tax was withheld. That is typically the case for certain foreign investment income. For Bitcoin investors this means: you have to calculate the taxable gain yourself and enter it in the relevant sections of the Austrian income tax return.

Which Records Do You Need?

To calculate the gain, investors should secure at least the following:

• purchase date,
• original acquisition cost,
• BTC amount,
• sale date,
• sale proceeds,
• fees,
• wallet transfers,
• earlier swaps,
• the platform's transaction histories.

With foreign crypto exchanges in particular, you should not assume that an automatically generated report matches the Austrian tax rules exactly.

Legacy Holdings Can Be Treated Differently

Bitcoin acquired up to and including February 28, 2021 can count as Austrian legacy holdings. Such coins do not generally fall automatically under the current crypto tax regime. For typical privately held legacy holdings, a later sale can be tax free under the earlier rules, provided the relevant conditions are met. The original acquisition date should therefore be checked before you file.

What Happens If the Gain Has Already Been Forgotten?

If a taxable Bitcoin gain was left out of a tax return that has already been filed, the error should not simply be ignored. Depending on the situation, a correction of the tax return may be required, or further steps where the facts are relevant under fiscal criminal law. Where crypto gains went undeclared intentionally, or possibly over several years, professional advice should be obtained before filing a voluntary disclosure on your own.

Conclusion

A Bitcoin sale without capital gains tax withheld is not automatically tax free in Austria. If no Austrian withholding agent was involved, a taxable gain regularly has to be declared through the income tax assessment. For taxable new Bitcoin holdings, the special tax rate of 27.5 percent generally remains decisive.

(As of September 18, 2026. This article is not investment advice. Prices and fee structures change; check the terms with the provider before you buy.)