Lost or stolen crypto tax in Australia: can you claim a capital loss?
Losing crypto to theft, a hack, or an irretrievably lost private key is financially devastating. Whether the ATO will allow you to claim a capital loss depends on whether you can prove that the loss is permanent — and the evidentiary bar is high.
Estimator coverage notice
This estimator does not currently support lost or stolen crypto scenarios. Calculating a capital loss for lost or stolen crypto involves evidentiary and legal questions that go beyond automated estimation. This page explains the general ATO treatment for educational purposes only. Consult a tax professional if you have experienced a material crypto loss. See the coverage page for a full list of what this estimator does and does not support.
How the ATO treats lost and stolen crypto
The ATO does not automatically allow a capital loss for lost or stolen crypto. Under Australian tax law, a capital loss arises when a CGT asset is disposed of for less than its cost base, or when a CGT asset is lost or destroyed. For crypto, demonstrating that the asset is truly lost or destroyed — rather than temporarily inaccessible — requires evidence. The ATO's guidance suggests that if there is a chance you could recover the crypto, you cannot yet claim a loss. The loss only crystallises when the loss is demonstrably permanent.
Worked example
You held 1 BTC with a cost base of AUD 20,000 on a centralised exchange that was hacked. The exchange has confirmed it cannot recover user funds and has entered insolvency. You have filed a police report and have the exchange's insolvency notification. In this situation, you may be able to claim a capital loss of AUD 20,000 (your original cost base) in the tax year when the loss became permanent. The ATO will likely request the evidence when reviewing the loss claim. If the exchange later makes a partial recovery distribution, that amount may partially reduce or reverse the claimed loss.
Common pitfalls
Private key loss is particularly difficult: there is no external documentation and no ATO guidance specifically addressing this situation. Exchange insolvency cases like FTX have introduced a separate complexity — creditors may eventually receive partial distributions, meaning the total loss amount is not yet known when the insolvency begins. Claiming a full loss before the insolvency process concludes may need to be reversed later. Scam victims face similar uncertainty — reporting to police is essential but does not automatically create a deductible loss.
Frequently asked questions
Can I claim a capital loss for stolen crypto in Australia?
Possibly, but not automatically. The ATO does not grant a capital loss simply because crypto was stolen or lost. You must be able to demonstrate that the loss is permanent and provide evidence such as police reports, exchange hack documentation, or proof that the private key is irrecoverably lost.
What evidence does the ATO need for a crypto loss claim?
The ATO requires evidence that the loss is permanent and not merely temporary. For theft, this could include a police report and documentation of the theft from the exchange or wallet provider. For lost private keys, you would need to demonstrate that recovery is impossible. Exchange insolvency cases may require proof of the insolvency process.
Tax Accuracy & Sources
General information about crypto tax in Australia for individual investors. Not tax advice.