Bitcoin Lost in a Wallet Hack: What Tax Applies in Austria?

Bitcoin Lost in a Wallet Hack: Can the Loss Be Claimed for Tax in Austria?

A wallet hack can amount to a complete economic loss for investors who hold Bitcoin. For tax purposes, however, losing the coins does not automatically create a deductible capital loss in Austria.

The theft of a cryptocurrency, a loss through fraud or a hacking attack, and the loss of the private key do not, in principle, constitute a disposal that is relevant for tax where the assets are held privately.

An Economic Loss Is Not a Tax Loss

Example:

• Bitcoin bought for €20,000
• the wallet is hacked
• all of the Bitcoin is stolen

Economic loss: €20,000.

For tax purposes, however, there is no disposal transaction at all. The investor has neither sold the Bitcoin nor exchanged it for another asset. In principle, therefore, no realised capital loss arises that could be offset against gains on shares, for example.

A Lost Private Key Does Not Help for Tax Either

The same applies where the Bitcoin technically still exists on the blockchain but the owner no longer has access to it. A lost private key does not, in principle, trigger a realisation for tax purposes either. Even a holding that is effectively worthless or permanently out of reach therefore does not automatically produce a recognised tax loss outside a business context.

Compensation Can Become Taxable Later On

The situation can look different where a claim for compensation exists against an exchange, a custodian or another responsible party. If the investor later receives damages or some other form of compensation, that inflow can become relevant for tax.

Example:

• Bitcoin acquisition cost: €10,000
• the coins are stolen
• compensation received later: €15,000

It then has to be examined what taxable gain or loss arises for tax purposes from that compensation payment.

Documentation Remains Important

Even if the hack does not create a tax loss to begin with, the whole episode should be documented in full.

This includes:

• wallet addresses,
• transaction IDs of the unauthorised transfers,
• the original acquisition cost,
• the date of the hack,
• the police report,
• correspondence with the exchange or wallet provider,
• any insurance or compensation claims.

These records become particularly important if money or cryptocurrencies are refunded at a later stage after all.

Business Assets Can Be Treated Differently for Tax

The treatment described here applies above all outside a business context. Where the Bitcoin was held as a business asset, different valuation and loss rules can apply. Entrepreneurs should therefore have such a loss assessed separately for tax.

Conclusion

Anyone who loses Bitcoin to a wallet hack generally cannot simply deduct the economic damage as a tax loss on privately held assets in Austria. The reason: theft, a hacking attack, fraud or the loss of the private key do not, in principle, count as a taxable disposal. Only later compensation or damages can trigger fresh tax consequences.