Crypto Losses & Tax-Loss Harvesting

Crypto losses aren't just bad luck — used properly, they lower your tax bill. In the US, realised capital losses offset capital gains and up to $3,000 of ordinary income a year, with any excess carried forward. Selling at a loss on purpose to bank it, known as tax-loss harvesting, is a legal, mainstream strategy. This guide explains how to use losses well, and the one rule people most often ask about — the wash sale. It is general information for the 2025 tax year, US-focused, checked 10 September 2026, and not tax advice.

What a crypto loss can offset

A realised capital loss — one where you actually sold or swapped at a loss — first offsets your capital gains, dollar for dollar. Net your short-term and long-term positions together, and if losses exceed gains, up to $3,000 of the remaining net loss can offset ordinary income each year ($1,500 if married filing separately). Anything left over carries forward to future years indefinitely, ready to soak up later gains. So a painful year can genuinely bank value: a large realised loss now can wipe out gains for years to come. Understanding how capital gains are netted is what makes loss planning make sense.

How tax-loss harvesting works

Tax-loss harvesting means deliberately selling an asset that's underwater to realise the loss, so you can use it against gains or income — then, if you still believe in the asset, you may buy back in. It's a standard technique in traditional investing, not a loophole, and it works the same way with crypto. The classic use is late in the tax year: if you're sitting on gains from winning trades and also holding coins at a loss, selling the losers can reduce or erase the tax on the winners. The loss is only 'harvested' once you actually sell — an unrealised loss does nothing for you. Keep clear records of each harvest, because you'll need the dates and figures for your Form 8949.

The wash-sale question

This is the part to get right, and to watch. The wash-sale rule, which stops investors claiming a loss on a security they rebuy within 30 days, applies to 'stocks and securities'. Because the IRS treats crypto as property rather than a security, the wash-sale rule generally does not apply to crypto under current US law as of the 2025 tax year — so, today, selling a coin at a loss and rebuying it shortly after can still bank the loss. But this is a moving target: Congress has repeatedly proposed extending the wash-sale rule to digital assets, with active proposals as recently as 2025 and 2026, and some would apply from a future tax year. Treat the current position as current, not permanent, and confirm the rule for your tax year before relying on a quick rebuy.

Losses from theft, scams and dead coins

Not every loss is a clean capital loss. Crypto that becomes worthless, is stolen, or is lost in a scam or an exchange collapse sits in murkier territory: the rules for claiming theft and worthlessness losses are narrow and have changed over the years, and simply holding a coin that has crashed to near-zero is still an unrealised loss until you dispose of it. If you were caught in a failure like a lender or exchange going under, the treatment can be genuinely complicated and is a question for a professional, not a forum post. And whatever the loss, you still report your activity honestly — claiming a loss you're not entitled to is its own risk.

Doing it without mistakes

Harvesting losses well means knowing which lots are underwater and by how much, which is hard to eyeball across several wallets. Good crypto tax software shows unrealised losses by lot and some tools include a harvesting view, so you can see the opportunities before year-end rather than discovering them afterwards. Just remember that the tax tail shouldn't wag the investment dog: only sell for tax reasons if it also makes sense for your portfolio. This is general information; for a harvesting plan tied to your own gains and bracket, and for the current wash-sale position, talk to a qualified tax professional.

Timing a harvest well

Harvesting is usually a year-end exercise, because by then you can see your realised gains for the year and how much loss it would take to offset them. The classic approach is to review your positions late in the tax year, identify coins sitting below their cost basis, and decide whether realising some of those losses makes sense against your gains and up to $3,000 of ordinary income. But don't let the calendar override your judgement: harvesting only helps if selling fits what you want to do with the asset anyway, and forcing a sale purely for a deduction can be a poor trade. It's also worth spreading attention across the year rather than scrambling on 31 December, since a rushed harvest is where record-keeping mistakes happen. The goal is a deliberate, documented decision, not a last-minute reflex.

Records and proof

A harvested loss is only as good as your ability to substantiate it. For each loss you claim, keep the acquisition date and cost, the disposal date and proceeds, and the resulting figure, so it can go cleanly onto Form 8949. If you rebuy the same coin afterwards — currently allowed for crypto under the property treatment — record that separately so your new position has its own fresh cost basis and holding period. Muddling the two is a common error that can distort future gains. Because losses interact with the same taxable-event rules as everything else, the same discipline applies: date it, value it, and keep the evidence. If the numbers or the wash-sale position are at all uncertain for your year, that is the moment to bring in a professional rather than guess.