Lost, Stolen or Scammed Crypto: Can You Claim a Capital Loss?

🧩 Three scenarios, three ATO outcomes🔗

Most people assume losing crypto is losing crypto. The ATO sees it differently. A capital loss only exists once a CGT event has actually happened, so the tax office needs a specific moment it can point to where you disposed of, or were permanently deprived of, a crypto asset.

Lost keys, theft and scams each raise that question in a different way, and sometimes there's no CGT event at all. Get the classification wrong on your return and you're either under-claiming a legitimate loss or claiming something the ATO will knock back. For the full picture on how crypto is taxed in Australia more broadly, see our crypto tax guide.

🔑 Scenario 1: You lost access to your crypto🔗

This is the scenario where the crypto still technically exists on the blockchain, sitting in a wallet, but you've lost the private key, forgotten the seed phrase, or a hardware wallet died with no backup.

You may be able to claim a capital loss if you can show two things: you genuinely owned the crypto, and the loss of access is permanent and irretrievable, not just temporarily inconvenient. If there's a realistic chance you could still recover the wallet, it isn't a loss event yet.

🎯 The essential: The capital loss is calculated as cost base minus proceeds. In a total, permanent loss, proceeds are zero, so if you paid $8,000 for crypto that's now permanently inaccessible, your capital loss is $8,000.

One nuance worth knowing: if you later recover the crypto, or receive compensation for it, any capital loss you claimed needs revisiting. Compensation above your original cost base can actually create a capital gain.

🚨 Scenario 2: Your crypto was stolen🔗

Theft, whether from a compromised exchange account, a wallet exploit, a SIM-swap attack or malware, is generally a cleaner case for a capital loss than lost keys, simply because there's usually more evidence: a blockchain transaction, possibly an exchange incident report, possibly a police report.

You can claim a capital loss equal to your cost base, since the proceeds from a theft are nil. If you later receive an insurance payout or other compensation, that reduces your capital loss, and if it exceeds your cost base you'd actually have a capital gain. The loss is recognised in the income year the theft happened.

One distinction worth flagging: if the exchange itself was hacked rather than your personal account, you didn't hold the crypto directly, the exchange did on your behalf. That's a different situation again, closer to an exchange collapse, which we cover further down.

🎣 Scenario 3: You were scammed🔗

This is where most people get caught out, because the tax treatment depends entirely on the mechanics of the scam, not just how it felt to lose the money.

Investment scams cost Australians close to a billion dollars in 2024 alone, and crypto features heavily in that figure. If you've been caught out, you're far from alone, and understanding which category you fall into is the first step to getting your tax return right.

🗂️ The evidence the ATO expects🔗

Whether you're claiming a theft or a scam loss, the ATO's evidence expectations are consistent, and the burden of proof sits with you.

• Full transaction history from every exchange or wallet involved
• Wallet addresses, both yours and the destination address where relevant
• Cost base documentation, purchase receipts, exchange confirmations, bank statements
• Proof of ownership, exchange records in your name, KYC documents, withdrawal history
• A police report, not strictly required but strongly recommended
• Exchange communications about the incident, if applicable
• Screenshots of the scam platform and any correspondence with scammers
• The AUD market value of the crypto at the time of the loss, from a reputable source

Keep everything for at least five years after you lodge the return claiming the loss. If you've never reported crypto activity before and you're not sure what the ATO already knows, our data matching deep-dive is worth reading first.

🧮 Worked example: $20,000 lost in a scam🔗

Say you were caught in a scam and sent $20,000 worth of Bitcoin (your cost base) to a fake platform. It's gone. You have transaction records, a police report and screenshots.

Now say in the same financial year you also sold shares for a $15,000 capital gain, held over 12 months so eligible for the 50% CGT discount. The loss is applied against the gain first, before any discount:

• $15,000 gain minus $20,000 loss = a net capital loss of $5,000
• No taxable capital gain this year, the $5,000 carries forward
• At a 37% marginal rate, wiping out that $15,000 gain (which would otherwise have been $7,500 after the discount) saves you roughly $2,775 in tax this year

🎯 The essential: The capital loss never touches your salary. If you earn $120,000 in wages and have no other capital gains that year, the $20,000 loss just sits there, carried forward, waiting for a future gain to offset.

🏚️ What if the exchange collapses?🔗

The FTX collapse in November 2022 left thousands of Australians unable to access funds, and it's a genuinely different tax situation from a straightforward theft.

When an exchange or platform holding your crypto goes into administration, the ATO's position is that a CGT event generally occurs, but only once the administration is finalised. Until an administrator or liquidator confirms in writing that no further distributions will be made, you generally can't determine your final capital loss.

The loss is claimed in the income year the administration is finalised, not the year the exchange collapsed. FTX's own restructuring process took years to resolve and eventually led to cash distributions to creditors, which is exactly why patience, and good record-keeping in the meantime, matters so much here.

👩‍💼 When to get a tax accountant involved🔗

A straightforward capital gain from selling crypto on a local exchange is something most people can handle themselves. Lost, stolen or scammed crypto is a different matter.

• The amount is significant, generally anything above $5,000 is worth professional advice
• Multiple wallets, exchanges, or transactions over time are involved
• You're unsure whether you actually owned a crypto asset at the point of loss
• Your exchange is in administration and you're waiting on a distribution
• You've already lodged and are wondering whether to amend
• The ATO has contacted you about your crypto reporting

A registered tax agent experienced with crypto can help reconstruct incomplete records and represent you if the ATO queries the claim. That advice is itself generally tax-deductible as a cost of managing your tax affairs.

❓ Frequently asked questions🔗