Crypto Tax Loss Harvesting and the Wash Sale Rule

Summary: Tax loss harvesting means disposing of crypto that is worth less than you paid, so the loss offsets gains elsewhere and lowers your tax bill. Because US rules treat crypto as property rather than a security, the 30 day wash sale rule that governs stocks does not currently apply to directly held coins. Congress keeps proposing to change that. General information, not tax advice.

• A loss only counts once you actually dispose of the asset. Paper losses do nothing.
• Losses offset capital gains first, then up to 3,000 dollars of ordinary income a year.
• Anything left over carries forward indefinitely to future years.
• Crypto funds and crypto-related shares are securities, so the wash sale rule does apply to those.

What Tax Loss Harvesting Actually Is

Capital gains and capital losses are netted against each other before tax is calculated. Harvesting is the deliberate act of realising a loss you already have on paper, so that it cancels out a gain you would otherwise be taxed on.

An example makes it concrete. Suppose you sold some ETH this year at a 5,000 dollar gain. You also hold SOL bought for 8,000 dollars that is now worth 5,000. Dispose of the SOL and you realise a 3,000 dollar loss, which reduces your net taxable gain to 2,000. Nothing about your overall wealth changed, but the tax owed did, because the loss moved from theoretical to realised.

Why Crypto is Treated Differently From Stocks

With shares, there is a catch. The wash sale rule blocks you from claiming a loss if you buy the same or a substantially identical security within 30 days either side of the sale. It exists precisely to stop people harvesting losses without ever giving up the position.

That rule is written to cover stocks and securities. US tax guidance classifies crypto as property instead, which puts directly held coins outside its scope. The practical consequence is the one everybody has noticed: you can realise a loss on a coin and rebuy it straight away, and the loss still counts.

Does the 30 Day Rule Apply to Crypto?

Not to coins you hold directly, under the law as it stands through 2026. There is no 30 day clock to wait out on Bitcoin, Ethereum, Solana, XRP or a stablecoin.

The important exception is that not everything crypto-flavoured is crypto for this purpose. Spot crypto funds traded on an exchange, and shares in mining or exchange companies, are securities, so the wash sale rule applies to them in full. Tokenised securities sit in genuinely unsettled territory. Holding a coin and holding a fund that tracks it are two different tax situations.

This Will Probably Change

Extending the wash sale rule to digital assets has been proposed repeatedly since 2021. A version passed the House in the Build Back Better bill and died in the Senate, it has appeared in budget proposals since, and it features in the digital asset tax overhaul Congress has been discussing through 2026. Nothing has been enacted so far.

One detail is worth knowing because it shows where this is heading. Form 1099-DA, the reporting form brokers now use for digital assets, already contains a box for wash sale losses disallowed. The reporting machinery is built and waiting. Most proposals have applied from a future date rather than retroactively, so a rule change is unlikely to reach back and undo a harvest you completed. It is a poor foundation for a multi-year plan, though, and worth rechecking each year before you rely on it.

How Much Crypto Loss Can You Write Off?

Losses are applied in a fixed order. First they offset capital gains, with short-term losses netted against short-term gains and long-term against long-term. Short-term gains are taxed at ordinary rates, so a loss that cancels one of those is doing the most work.

If losses exceed gains, up to 3,000 dollars of the excess can be deducted against ordinary income in that year, or 1,500 dollars if you file separately from a spouse. Whatever remains carries forward with no expiry date, and the netting and carryforward rules are set out in Publication 550. A large loss year is not wasted just because you had no gains to offset.

How a Harvest Works, Step by Step

• Identify the specific lots trading below what you paid, not just the coins that feel down.
• Check the holding period of each lot, since short-term and long-term losses are used differently.
• Dispose of them, which can mean selling, swapping, or spending them.
• Decide separately whether you want the position back, and remember that rebuying resets your cost basis to the new lower price.
• Record the date, amount and dollar value of every leg while you can still see them.
• Report each disposal on Form 8949, losses included. An unreported loss is not a loss claimed.

Where People Get This Wrong

• Assuming an unrealised loss helps. Until the asset is disposed of, it does nothing at all.
• Weak basis records. Since 2025, basis is tracked wallet by wallet rather than pooled, so a loss you cannot evidence per wallet is a loss you may not be able to defend.
• Harvesting with no gains and little income, where the benefit is capped at the annual deduction and the rest simply waits.
• Ignoring the cost of the round trip. Trading fees and the spread on the way out and back in eat into the saving.
• Treating a crypto fund like a coin, and walking into the wash sale rule that does apply to it.

Is There a Downside to Harvesting?

Yes, and it is mostly about timing rather than legality. Rebuying at a lower price lowers your cost basis, which means a bigger taxable gain later if the asset recovers. You have deferred tax rather than erased it, which is usually still worth doing, but it is not free money.

There are smaller costs too. Every extra transaction is another row to reconcile at filing time, and if you sell intending to rebuy, the price can move while you are out of the position. Aggressive same-minute round trips repeated all year also look like exactly what they are, and a thin paper trail is where that becomes a problem.

Working Out Whether a Harvest is Worth It

Three questions settle most cases. Do you have realised gains this year that a loss could offset. Can you evidence the cost basis of the lots you plan to dispose of. Does the tax saved exceed the fees and spread of doing it. If the answers are yes, yes and yes, the arithmetic is straightforward, and anything involving large sums or several years of messy history is worth putting in front of an accountant rather than a calculator.

It is also worth remembering that spending a coin counts as disposing of it, so a loss can be realised on the way to buying something you actually wanted rather than through a round trip on an exchange. If the records are the weak point, a Koinly gift card covers the software that tracks lots and basis for you.