How to Tax Loss Harvest Crypto: Lot Selection, Wash Sales, and Reporting

To tax loss harvest crypto, you sell digital assets that are worth less than you paid, lock in the loss on the blockchain and in your records before December 31, and then use that loss to offset capital gains plus up to $3,000 of ordinary income ($1,500 if married filing separately).¹ Anything left over carries forward indefinitely to future years. Because the IRS treats crypto as property rather than a security, the wash sale rule that blocks this strategy for stocks does not currently apply, so you can sell a token at a loss and buy it back the same day.

What You Need Before You Sell

Every disposal you plan to report needs three data points: your cost basis (what you paid, including exchange fees of roughly 0% to 1.5% that get added to basis), the date you acquired the asset, and the proceeds you received when you sold or swapped it.

Starting with 2026 transactions, centralized exchanges that qualify as brokers must report both gross proceeds and cost basis on Form 1099-DA.² If Box 1g on your 1099-DA is blank, the broker didn’t have your basis and you’ll need to calculate it from your own records.³ For tokens held in self-custody wallets or traded on decentralized exchanges, no 1099-DA exists at all. Pull the transaction hashes from a blockchain explorer and match them against your own purchase records to reconstruct basis.

Choosing Which Lots to Sell

Cost basis method determines which specific units get treated as sold when you dispose of part of a holding. The default is First-In, First-Out (FIFO), meaning the oldest units go first. Under the 2024 final regulations, FIFO now runs on a per-wallet or per-account basis rather than pooling all your wallets together.⁴ Each wallet keeps its own queue.

Specific identification is the stronger tool for harvesting. It lets you hand-pick the lots with the highest basis and largest unrealized losses. The requirement is documentation: you must identify the specific units before or at the time of the sale, recording the purchase date, time, and price for each one.⁵ Without that proof, the IRS falls back to FIFO, which may leave your best losses on the table.

Short-Term Losses Are Usually Worth More

Crypto held for one year or less produces a short-term loss when sold. Held for more than a year, it produces a long-term loss.⁶

Short-term losses first offset short-term gains, which are taxed at ordinary income rates (10% to 37% for 2026).⁷ Long-term losses first offset long-term gains, which are taxed at 0%, 15%, or 20%. When choosing between two candidates for harvesting, a short-term loss generally delivers more tax savings per dollar because it’s canceling out income that would otherwise be taxed at a higher rate. High earners should also account for the 3.8% Net Investment Income Tax that applies to gains once modified adjusted gross income tops $200,000 (single) or $250,000 (married filing jointly).⁸

The Crypto Wash Sale Loophole

Section 1091 blocks investors from claiming a loss on “stock or securities” if they buy a substantially identical asset within 30 days before or after the sale.⁹ The IRS classifies cryptocurrency as property, not a security, so digital assets sit outside that rule.¹⁰ You can sell Bitcoin at a loss and buy it back the same hour, claim the full loss, and stay in the market. No legislation extending the wash sale rule to crypto has been enacted as of 2026, though proposals keep surfacing. The 2026 Form 1099-DA already contains a field for wash sale loss disallowed, suggesting the IRS is preparing the reporting plumbing in advance.

The absence of a wash sale restriction does not eliminate the economic substance doctrine, which requires a transaction to change your economic position beyond just reducing tax.¹¹ A sell-and-rebuy at the market price should clear that bar because you’re realizing an actual loss while maintaining exposure. Repeated same-day round-trips with no other purpose are the pattern the IRS could theoretically challenge. Keep a genuine investment rationale and document it.

Executing the Sale Before Year-End

A loss doesn’t exist for tax purposes until you dispose of the asset, and the transaction must settle by December 31 to count for that year. Selling for U.S. dollars is the cleanest path. Trading one crypto for another also triggers a disposal, with the loss measured against the fair market value of whatever you received.¹² Save a trade confirmation or screenshot immediately, capturing the date, time, amount, and price. Crypto trades 24/7, and an execution that slips past midnight moves the loss into the next tax year.

Worthless or Abandoned Tokens

For tokens that have lost all value and trade nowhere, Section 165 allows a deduction if you can demonstrate the asset is genuinely worthless and you’ve permanently given up all rights to it.¹³ Worthless assets are treated as sold on the last day of the tax year. Keep documentation showing that trading dried up, the project was abandoned, or the underlying blockchain stopped functioning. Claiming a worthlessness deduction extends the IRS recordkeeping requirement to seven years.¹⁴

Reporting the Losses on Your Return

Every individual crypto disposal goes on Form 8949. Each row captures asset description, date acquired, date sold, proceeds, and cost basis, with the gain or loss in column (h).¹⁵¹⁶¹⁷

If total losses exceed total gains, up to $3,000 of the net loss applies against ordinary income ($1,500 married filing separately). Anything above that carries to next year and runs through the same netting.¹ Carryforwards have no expiration. A single brutal year in crypto can shelter income for a decade.

Answer the digital asset question at the top of Form 1040 truthfully. It asks whether you received, sold, exchanged, or disposed of a digital asset at any point during the year.¹⁸ If you harvested losses, the answer is yes. A blank or a “no” that contradicts a 1099-DA already sitting in IRS files invites scrutiny.

Staking Rewards, Airdrops, and Forks Are Harvesting Candidates

Staking rewards and airdrops arrive as ordinary income, valued at fair market value on the date you gain control.¹⁹ That same value becomes your cost basis in the new tokens. If a $500 staking reward later trades at $100, selling produces a $400 capital loss. You’ve already paid tax on the $500 as income, and harvesting the loss claws some of that back. Investors often ignore rewards and airdropped tokens because they think of them as free, but the basis is real and the losses can be substantial in a downturn.

A hard fork that hands you tokens on a new blockchain follows the same pattern, but only if you actually received and controlled the forked tokens. A fork you never claimed generated no income and left you no basis to harvest.¹⁹

Penalties and Audit Windows

Underreporting income or inflating losses can trigger a 20% accuracy-related penalty on the underpayment attributable to negligence or a substantial understatement (generally an understatement exceeding the greater of 10% of the correct tax or $5,000).²⁰ The IRS doesn’t distinguish between careless math and aggressive positions when the penalty applies.

The audit window runs three years from filing, six years if you omit more than 25% of gross income, and forever for fraud.²¹ With Form 1099-DA now reporting basis alongside proceeds, the IRS can spot mismatches it couldn’t see a few years ago.

Recordkeeping

Keep records for at least three years from the date you filed. Seven years if you claimed a worthlessness deduction.¹⁴ If you carry a loss forward, hold the records until three years after the final return that uses any portion of it. Document asset type, date and time of every acquisition and disposal, number of units, and fair market value at each point.⁵ For specific identification, keep transaction IDs and timestamps that link each sold unit to its original purchase. Wallet-to-wallet transfers between accounts you own are not taxable, but track them anyway to preserve basis and holding period.¹²

1
Office of the Law Revision Counsel. 26 U.S. Code 1211 – Limitation on Capital Losses
2
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3
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Internal Revenue Service. Topic No. 409, Capital Gains and Losses
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Office of the Law Revision Counsel. 26 U.S. Code 1091 – Loss From Wash Sales of Stock or Securities
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Office of the Law Revision Counsel. 26 U.S. Code 7701 – Definitions
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Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets
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Internal Revenue Service. Schedule D (Form 1040)
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