Crypto Tax-Loss Harvesting in 2026: How It Works (2025 Filing / 2026 Planning Guide)

Tax-loss harvesting is the most reliable, fully legal way to cut a US crypto investor’s tax bill. The strategy is simple in concept — sell positions trading below your cost basis, realize the loss, and use it to offset gains — but the mechanics changed meaningfully for the 2025 tax year and 2026 planning year. Wallet-by-wallet basis tracking is now mandatory, Form 1099-DA is live, and the specific identification relief that covered 2025 has expired.

This guide walks through the statutory framework, the wash sale question, a step-by-step process, and worked numerical examples for the 2025 return you file in 2026 and the 2026 positions you are managing now.

Key Takeaways

• Losses must be realized to count. An unrealized decline in a token you still hold produces no deduction. You must actually dispose of the asset (IRC §1001).
• Netting follows a fixed order. Short-term against short-term, long-term against long-term, then cross-netting (IRC §1222).
• Only $3,000 of net capital loss offsets ordinary income per year ($1,500 if married filing separately) under IRC §1211(b). The rest carries forward indefinitely under IRC §1212(b), retaining its short-term or long-term character.
• The wash sale rule in IRC §1091 applies to “stock or securities.” Because the IRS treats convertible virtual currency as property rather than currency or securities (Notice 2014-21, Q&A-1), §1091 has not historically reached most digital assets. Congress has repeatedly proposed changing this. Confirm current law before relying on same-day repurchase.
• Basis is now tracked wallet-by-wallet. Universal or aggregate basis pooling is no longer permitted for dispositions on or after January 1, 2025 (Treas. Reg. §1.1012-1(j); Rev. Proc. 2024-28).
• Specific identification must now be made at or before the moment of sale — the transitional relief in Notice 2025-7 covered calendar year 2025 only.

1. Why Crypto Losses Are Worth Harvesting

Under Notice 2014-21, cryptocurrency is property. Every disposition — selling for dollars, trading BTC for ETH, spending crypto on goods — is a realization event under IRC §1001 producing capital gain or loss for investors. Losses on property held for investment are deductible under IRC §165(c)(2).

Holding period governs the rate. Assets held one year or less produce short-term gain taxed at ordinary rates up to 37%; assets held more than one year produce long-term gain taxed at 0%, 15%, or 20% (IRC §1(h), §1222). High earners may also owe the 3.8% net investment income tax under IRC §1411. A short-term loss is therefore the most valuable kind of loss, because it first offsets the most expensive kind of gain.

2. The Wash Sale Question — Read This Carefully

IRC §1091 disallows a loss when a taxpayer sells stock or securities and acquires substantially identical stock or securities within 30 days before or after the sale. The disallowed loss is added to the basis of the replacement position rather than lost outright.

By its plain text, §1091 reaches “shares of stock or securities.” Most cryptocurrencies are not securities for this purpose, and the IRS has never issued guidance extending §1091 to digital assets. This is why crypto investors have historically been able to sell at a loss and repurchase immediately — a maneuver unavailable to equity investors.

Three important caveats:

1. Legislative risk is real. Proposals to extend §1091 to digital assets have appeared in multiple budget and revenue bills since 2021. Verify the statute’s current scope for your tax year before executing a same-day repurchase strategy.
2. Tokenized securities are different. A digital asset that is a security under the Howey framework — a tokenized equity, certain investment contracts — is squarely within §1091.
3. Economic substance still applies. IRC §7701(o) and the judicial sham-transaction doctrine remain available to the IRS. A round-trip through the same exchange in the same minute, at the same price, with no market exposure, is a weaker position than a sale followed by a genuine gap or a switch into a different asset.

The conservative approach: wait more than 30 days, or rotate into a genuinely different asset (BTC to ETH, or a large-cap token to a broad basket) rather than buying back the identical unit instantly.

3. Step-by-Step: How to Harvest a Crypto Loss

1. Pull a per-wallet, per-lot basis report. Since January 1, 2025, basis is tracked separately for each wallet or account. You need acquisition date, quantity, and cost basis for every lot in every wallet.
2. Identify lots trading below basis. Compare current fair market value to each lot’s basis under IRC §1012, which includes acquisition fees.
3. Quantify your existing gains for the year. Include gains you may not think of as sales: crypto-to-crypto swaps, DeFi token exchanges, and NFT sales are all dispositions.
4. Choose lots using specific identification. Under Treas. Reg. §1.1012-1(j), you must adequately identify the units sold no later than the date and time of the disposition. For custodial accounts in 2026, this generally means making the election with the broker at the time of sale. Without adequate identification, FIFO applies within that wallet by default.
5. Execute and document. Record the timestamp, quantity, proceeds, USD fair market value, fees, and the specific lot identified. Retain exchange confirmations and on-chain transaction hashes.
6. Report on Form 8949 and Schedule D. Short-term transactions go in Part I (Boxes A/B/C), long-term in Part II (Boxes D/E/F). For 2025 dispositions, most crypto lands in Box B or Box E — Form 1099-DA reported gross proceeds but not basis. Basis reporting for covered digital assets begins with 2026 acquisitions.

4. Worked Numerical Examples

Example A — Straight offset of a short-term gain

In February 2026 you sold BTC and realized a $10,000 short-term gain. In March 2026 you bought 2 ETH at $4,200 each ($8,400 total basis). ETH now trades at $2,800.

• Sell 2 ETH: proceeds $5,600 − basis $8,400 = ($2,800) short-term loss
• Net short-term gain: $10,000 − $2,800 = $7,200
• At a 32% marginal rate: tax drops from $3,200 to $2,304 — $896 saved

Note the hidden cost: if you repurchase ETH, the new lot starts a fresh short-term holding period.

Example B — Netting order, the $3,000 cap, and carryforward

Your 2025 results:

• Short-term gains $4,000; short-term losses $19,000 → net short-term loss $15,000
• Long-term gains $6,000; long-term losses $1,000 → net long-term gain $5,000
• Cross-net (§1222): $15,000 − $5,000 = $10,000 net capital loss
• §1211(b): deduct $3,000 against ordinary income — at a 24% rate, $720 saved
• §1212(b): carry forward $7,000 as short-term to 2026 and beyond, indefinitely

The full benefit is larger than $720: the harvest also eliminated tax on $5,000 of long-term gain.

Example C — Why lot selection dominates

You hold three BTC lots in one wallet:

• Lot A: 0.5 BTC @ $30,000/BTC = $15,000 basis (acquired January 2024, long-term)
• Lot B: 0.5 BTC @ $96,000/BTC = $48,000 basis (acquired February 2025)
• Lot C: 0.5 BTC @ $118,000/BTC = $59,000 basis (acquired January 2026, short-term)

BTC trades at $85,000. You sell 0.5 BTC for $42,500.

• Default FIFO (Lot A): $42,500 − $15,000 = $27,500 long-term gain
• Specific ID (Lot C): $42,500 − $59,000 = ($16,500) short-term loss

Same trade, same price, $44,000 swing in reported income — driven entirely by whether you made a timely specific identification.

5. Traps and Limitations

A worthless token is not automatically a loss. In CCA 202302011, the IRS concluded that a cryptocurrency that had declined to less than one cent but still traded on an exchange was neither worthless under §165 nor abandoned, because the taxpayer retained dominion and took no affirmative act of abandonment. If a position is genuinely dead, sell it for a nominal amount to create a clean realization event.

Illiquid and locked assets. Staked tokens subject to an unbonding period, vesting allocations, and LP positions may not be disposable before year-end. Plan the unlock timing in advance.

NFTs may be collectibles. Under Notice 2023-27, the IRS applies a look-through analysis to determine whether an NFT is a collectible under IRC §408(m), which carries a 28% maximum long-term rate. Losses still net normally, but the gains they offset may be taxed differently than expected.

Fees erode the benefit. Gas, spread, and exchange fees are real costs. Harvesting a $400 loss at a 24% rate saves roughly $96 — not worth $80 of gas on a congested network.

State conformity varies. Not every state follows federal capital loss rules. New Jersey, for instance, does not permit capital loss carryforwards against other income categories, and Pennsylvania applies its own regime. Residents of no-income-tax states (FL, TX, WY, NV, TN, SD, WA on most income, AK, NH) capture only the federal benefit.

Consider the inverse for low-income years. If your 2025 taxable income is below the 0% long-term capital gains threshold — $48,350 single, $96,700 married filing jointly — gain harvesting may beat loss harvesting. Sell appreciated long-term positions at a 0% federal rate and immediately repurchase to step up basis.

Action Steps

1. Reconcile every wallet now, not in December. Confirm your basis records are segregated by wallet and account as required for post-2024 dispositions, and that your Rev. Proc. 2024-28 allocation from January 1, 2025 is documented.
2. Confirm your broker supports specific identification at trade time. Notice 2025-7 relief applied to 2025 only. For 2026 dispositions, an after-the-fact software designation may not satisfy Treas. Reg. §1.1012-1(j).
3. Reconcile Forms 1099-DA against your own records. The first 1099-DAs arrived in early 2026 for 2025 activity and report gross proceeds. Mismatches are a common audit trigger; report the correct basis and attach an explanation if needed.
4. Run a mid-year gain/loss projection. August is the right time to know your year-to-date realized position for 2026 rather than discovering it in late December.
5. Verify the wash sale rule’s current scope for your tax year before executing any immediate-repurchase harvest.
6. Dispose of dead positions affirmatively rather than relying on a worthlessness claim.
7. Track carryforwards on the Capital Loss Carryover Worksheet in the Schedule D instructions, and preserve short-term versus long-term character across years.
8. Donate winners, sell losers. Appreciated long-term crypto donated to a qualified charity generally yields a fair market value deduction under IRC §170 with no recognized gain (Form 8283 and a qualified appraisal are required above $5,000). Depreciated crypto should be sold to realize the loss, with the cash donated.

Bottom Line

Tax-loss harvesting converts portfolio pain into a hard dollar reduction in tax. The 2026 landscape rewards discipline: per-wallet records, contemporaneous lot identification, and clean documentation. The investors who lose this benefit rarely lose it because the law changed — they lose it because their basis records could not support the position they took.

This content is for informational purposes only and does not constitute legal advice. Consult with a qualified US attorney for guidance specific to your situation. Tax outcomes depend on individual facts — consult a qualified tax professional before executing any harvesting strategy.