Stolen, scammed or rug-pulled crypto: can you claim the loss in the UK?

Almost everyone who has crypto stolen assumes the same thing: it's gone, that's a loss, and a loss cuts my tax bill. It feels obvious, and it feels fair. But UK tax rules don't work the way most victims expect, and getting this wrong can mean either claiming relief you're not entitled to, or missing relief you could genuinely have had. So before you put a number anywhere near your tax return, it's worth understanding what HMRC actually says.

Why theft usually isn't a “loss” for tax

Capital Gains Tax only bites when you disposeof an asset, and an allowable loss only arises the same way, on a disposal. That's the hinge everything turns on. HMRC's position, set out plainly in its Cryptoassets Manual, is that theft is not a disposal. Its reasoning is that when your crypto is stolen you still legally ownit. You've lost control of it, but not ownership, and you keep the right to recover it. Because there's no disposal, there's no automatic capital loss to set against your gains.

This is the opposite of what almost everyone assumes, so it's worth saying again clearly: having your crypto stolen, hacked, or drained does not, by itself, give you a deductible tax loss. The coins still exist on the blockchain, just in someone else's wallet, and in HMRC's eyes they're still yours until you've exhausted any prospect of getting them back.

Watch out

“It was stolen, so I'll just claim the loss” doesn't work

Reporting a stolen amount as a capital loss without any valid claim behind it is simply wrong under HMRC's rules, and it can create problems of its own. The loss doesn't arise from the theft. Where relief is available at all, it comes through a separate, formal step: a negligible value claimon the token you still own. That's the path this guide is about.

The one distinction that decides everything

Almost every scenario below comes down to a single question: do you still own a token, even a worthless one? Keep that in mind and the rules stop feeling contradictory.

You still own a worthless token. A rug pull left a dead token sitting in your wallet; drained coins still exist on-chain and you retain legal ownership; a project collapsed but the token is still yours. Here you can often crystallise the loss with a negligible value claim, treating the asset as sold for next to nothing even though you never actually sold it.
You never received a token at all.You paid for coins and got nothing, or the whole thing was a fake with no asset ever delivered to you. HMRC's position here is more cautious, and a capital loss may not be available.

The mechanics of a negligible value claim (how it crystallises a loss without a sale, the fact that it applies to your whole Section 104 poolfor that token, and the “still exists and still owned” conditions) are covered in full in our crypto losses guide. This guide focuses on how that rule lands in the specific mess of theft, fraud and exchange collapse.

Your situation, and how HMRC is likely to treat it

The table below is a starting point, not a ruling on your facts. Several of these are genuinely fact-dependent, which means HMRC decides case by case rather than by a fixed rule. Where it's marked fact-dependent, treat that seriously.

Scenario by scenario

Can you claim a loss?

Wallet hacked, private key compromised, coins drained.Not a disposal. You still own the coins and have a right to recover them, so there's no automatic loss. If recovery is genuinely hopeless, a negligible value claim on the still-owned coins may crystallise the loss.
Phishing drain (you were tricked into signing a transaction).Treated the same as theft. You retain legal ownership of tokens now sitting in the attacker's address, so no automatic loss. A negligible value claim may be available if there's no realistic prospect of getting them back. If they're later recovered, there was never a loss.
Rug pull or exit scam (token still in your wallet, price gone to zero).Not a disposal either, because the token still exists and you still hold it. But this is the clearest case where a negligible value claim works: you don't have to sell the dead token, the claim itself crystallises the loss.
Sent crypto to the wrong address (your own mistake, not fraud).Not a disposal. You still legally own the asset even though you can't reach it. A negligible value claim may be available once you've genuinely abandoned any hope of recovery.
Funds trapped in a collapsed exchange (FTX, Celsius and similar).Highly fact-dependent. The asset still exists and may be partly recoverable through the bankruptcy, so a negligible value claim is only realistic once you can show no reasonable prospect of recovery. Timing matters a lot (see below), and if you hold the same token elsewhere too, there's a pooling trap to watch for.
Paid a fake investment platform and received nothing (or a non-transferable IOU). Fact-dependent, and often the hardest case. Report it to Action Fraud straight away (0300 123 2040), even before you think about a claim. On the tax side, if you never took delivery of any token, HMRC's own manual says you may notbe able to claim a capital loss. That's cautious wording, not a flat no, so don't assume the door is shut without advice.

Watch out

The pooling trap: you can't write off just the FTX portion

A negligible value claim applies to your whole Section 104 pool of a token, not to a slice of it. So if you held, say, some ETH on FTX and more ETH in your own wallet, you cannotmake a negligible value claim for only the ETH lost on FTX while keeping the rest. HMRC's view is that your surviving holdings of that same token still have value, so the token as a whole is not of negligible value and the claim doesn't get off the ground. This is a real constraint that catches people out, so before you plan a claim, check whether you hold any more of the same token anywhere else.

Trapped in a collapsed exchange? Mind the timing

Exchange failures like FTX and Celsius are their own trap. First, a caveat worth being honest about: HMRC's Cryptoassets Manual doesn't specifically address exchange insolvency at all. The published guidance covers theft and non-receipt, so how a negligible value claim applies to a collapsed exchange is worked out from the general rules, not from a rule written for this exact situation. That alone is a reason to tread carefully.

The timing tension is the core problem. Claim too early, while the bankruptcy is still running and some recovery is possible, and HMRC can reject the negligible value claim on the basis that the asset still has potential value. Claim too late and you can miss the chance to backdate the loss to an earlier tax year. A negligible value claim can be backdated, but only if you owned the asset then and it had genuinely become of negligible value at that earlier date, and there are time limits on how far back you can go. The exact window is procedural and easy to get wrong, so confirm it with HMRC or a tax adviser for your specific year of claim rather than assuming.

In practice, many advisers suggest making the claim in the tax year afterthe recovery outcome becomes clear, when you actually know whether you're getting anything back and how much. That is practical advice to avoid HMRC arguing the asset still has value, not a rule HMRC has published. It carries its own risk, because waiting too long can cost you the backdating window. This is a genuinely fact-dependent, often high-value situation, so if real money is at stake it's worth getting independent tax advice before you file.

One more thing that reassures people once they hear it: a negligible value claim, once made and accepted, is final for that year. If your coins are later recovered, the loss still crystallised when you claimed it, so the claim stands. You don't reverse or amend it retrospectively. That's another reason not to rush: it's usually calmer to wait until recovery prospects are clear before you claim. And if you do claim earlier, keep contemporaneous evidence of why you believed, at the time, that recovery was hopeless. If you get a partial distribution, the treatment of the recovered portion is itself fact-dependent, so it's a good moment to take advice rather than guess.

What to actually do

Check this first

These steps only apply if you can genuinely crystallise a loss

Before you follow the steps below, make sure your situation actually qualifies: you own a worthless token that still exists, or recovery of drained or trapped coins is genuinely hopeless. If you never received any token at all, or you're unsure whether you ever held it, or you still hold the same token elsewhere with value in it, don't use these steps. Get advice first, because filing an invalid claim creates its own problems.

If your situation is one where a loss can be crystallised (a rug-pulled token in your wallet, a drained wallet with no recovery prospect, an exchange collapse where the outcome is now clear), here's the practical route.

Report the crime, if it was one. For a hack, scam or fraud, report it to Action Fraud (or call 0300 123 2040). This creates a police record that can help with civil recovery, but it does notautomatically tell HMRC anything, and HMRC doesn't publish guidance saying a police report strengthens a negligible value claim. You still have to notify HMRC separately through your tax return, and what actually matters to HMRC is evidence of the asset's current value. Report to Action Fraud because it's the right thing to do and it documents that the loss was real; just don't expect it to do the tax work for you.
Gather the proof. You need proof of two things. First, what you originally paid (purchase receipts, exchange statements, payment confirmations), so the loss amount can be calculated. Second, that the asset still existsand is now worth next to nothing. That second point is a genuine deal-breaker: if the token's contract has been destroyed or deleted, or the token no longer exists on the blockchain, a negligible value claim will fail, because HMRC requires that you still own something, even if it's worthless. Good evidence is a blockchain explorer showing the token still sits in your address but has no liquidity, no trading market, no real holders, or an abandoned contract. Keep it all, with dates. For larger claims (very roughly £10k or more), HMRC often asks for a formal CG34 valuation from a qualified accountant or surveyor. That isn't a legal requirement, but HMRC treats it as evidence of negligible value, so budget for the cost and time if your claim is material.
Make the negligible value claim. This is the formal step that creates the loss. You claim it on the SA108 capital gains pagesof your Self Assessment, identifying the asset, the date it became of negligible value, and the value you're treating it as disposed of for (usually zero). Remember it applies to your whole pool of that token, not the individual coins, so it only works if all your holdings of that token are genuinely worthless.
Use the loss. The claim gives you an allowable capital loss equal to your pooled cost. You set it against gains in the same year, or carry it forward. One thing worth being clear on: a crypto loss is a capitalloss, so it offsets capital gains only. You can't deduct it from your salary or other income.
Notify HMRC in time.A loss is only usable once claimed, and there's a hard deadline: you have 4 years from the end of the tax year in which the loss arose. Miss it and the loss is gone for good, however good your evidence is.

Watch out

The mistakes that cost people their relief

Assuming the theft is the loss.It isn't. Without a negligible value claim on a token you still own, there's no allowable loss to report.
Claiming on part of a holding.A negligible value claim covers your whole Section 104 pool of that token. You can't claim the loss on the coins in one wallet or exchange and keep the rest. If any of your holdings of that token still have value, the claim can fail.
Claiming on a token that no longer exists.The asset has to still exist for the claim to work. A contract that's been destroyed or deleted is not a negligible value claim, it's nothing to claim on.
Confusing theft with non-receipt.If you paid but never received any token, HMRC's stance is more cautious than for theft, and a loss may not be available. Check whether you actually hold anything, even a worthless token, and get advice if it's unclear.
Claiming an exchange collapse too early. While recovery is still possible, HMRC can say the asset still has value. Usually best to wait until the outcome is clear.

How our calculator handles this (honestly)

A quick, honest note, because it matters here. When a balance simply disappears from your history (coins drained, a token that stops trading), CryptoCGTdoes not silently invent a loss for you. That's deliberate and it's the safe, correct behaviour: as you've read above, a vanished balance is not automatically a deductible loss under HMRC's rules, and a tool that booked one for you would be putting a wrong number on your return.

Booking a genuine negligible value claim is a decision you make about your own facts, not something the software should assume, so right now it's a manual step: you decide the claim is valid, and you enter it on your SA108. What the calculator does do well is the hard part underneath: work out your pooled cost for the token, so you know the exact figure the loss would be if you do make the claim. Always check it against your own records.

When to get a qualified adviser

A lot of this is well-settled, but the edges genuinely aren't, and this is a fact-dependentarea where HMRC decides case by case. If you're dealing with a collapsed exchange and unsure when to claim, a non-receipt fraud where it's unclear whether you ever held an asset, a partial recovery, or simply a large sum, it's worth paying a qualified UK crypto tax adviser to review the claim before you file. This guide is general information, not tax advice. If your situation is bigger than a rounding error, get it checked.

Not sure how crypto tax applies to you in the first place? Start with how UK crypto tax works, then come back to the losses guide for the full mechanics of claiming.

Sources

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This guide is information, not tax advice.Figures and thresholds are for the tax year shown (England, Wales & Northern Ireland; Scottish income tax bands differ). Rates and rules can change, and your own position may differ — check your circumstances and speak to an accountant before you file. CryptoCGT is an information tool, not a regulated tax adviser.