Lost or Stolen Crypto: Can You Claim a Tax Deduction?

Every large hack produces a wave of the same question, and the honest answer is less generous than most articles suggest. Losing crypto and having a deductible loss are different things, and which one you have depends on how it was lost.

These are four separate questions. Answering them as one is why people expect a deduction they do not get.

1. Theft and hacks

The personal casualty and theft loss deduction was substantially narrowed by the Tax Cuts and Jobs Act, which limited personal casualty losses for the affected years to those attributable to a federally declared disaster. A hacked wallet is not a federally declared disaster.

There is a meaningfully different analysis where the loss arises in a transaction entered into for profit, or in a trade or business, rather than as a personal casualty. Which of those describes your situation is fact specific, and it is the question worth putting to a professional rather than assuming the answer either way. Because the limitation is time bound, confirm the position for the year in question rather than relying on a general statement.

2. Lost keys and inaccessible wallets

This is the hardest case and the one people are most confident about. A loss generally requires a realisation event: something that closes the position. Coins you still own but cannot reach have not been disposed of. They are not gone in the sense a tax system recognises, they are unreachable, and the two are not the same.

There is no clean, generally applicable route to deducting a lost seed phrase, and content that says otherwise is usually eliding the distinction between abandonment, worthlessness and inaccessibility.

3. Exchange collapse and frozen funds

A failed exchange sits in a different place again, because a bankruptcy proceeding is running and your position is a claim. Until the amount recoverable is determined, the loss is not fixed, which is precisely what a deduction generally requires. Claims also get sold and distributions get made, both of which are events with their own consequences.

This one genuinely requires advice specific to the proceeding you are in, since the timing question turns on the facts of that bankruptcy.

4. Worthless tokens

A token that has collapsed to near zero but still exists and still trades is not worthless, it is cheap. The cleanest treatment for a position you have written off is usually the simplest: dispose of it. Selling for whatever nominal amount the market will bear is a realisation event, and it produces an ordinary capital loss you can actually evidence.

That loss then behaves normally. Losses offset gains, and up to 3,000 dollars of net losses reduce ordinary income each year with the rest carried forward. The wash sale rule applies to stocks and securities rather than crypto property, so as of 2026 repurchasing does not disallow the loss, though extension of the rule to crypto has been repeatedly proposed.

For a token with no market at all, the analysis is worthlessness rather than sale, which is a harder evidentiary standard.

Documentation, whichever route applies

• Your cost basis in the affected units. Without it there is no loss to quantify, whatever the theory.
• The date and, where possible, the transaction hashes showing the outflow.
• Contemporaneous evidence: exchange communications, incident reports, police or agency reports where relevant, bankruptcy claim filings.
• Evidence of recovery efforts and their outcome, since an unresolved prospect of recovery is what keeps a loss from being fixed.

The realistic summary

The most reliably available deduction is the ordinary capital loss on a disposal you actually make. The theft loss route is narrower than its reputation. The lost keys route mostly does not exist. And a collapsed exchange is a waiting problem rather than a filing problem until the proceeding resolves.

Our tax loss harvesting guide covers realising losses deliberately, and US crypto tax covers how losses are used once realised.

General information, not tax advice. Rules change and depend on your circumstances. Confirm the current position with the relevant tax authority or a qualified tax professional.