What Is Crypto Tax Loss Harvesting?

Tax loss harvesting is the strategy of selling cryptocurrency at a loss to offset capital gains and reduce your tax bill. If you hold crypto assets that have declined in value, you can sell them to realize the loss, then use that loss to cancel out gains from profitable trades — potentially saving thousands of dollars in taxes. Under current IRS rules, cryptocurrency is not subject to the wash sale rule that applies to securities, though pending legislation may change this.

How Tax Loss Harvesting Works

The basic principle is straightforward: capital losses offset capital gains dollar for dollar.

Step 1: Identify Unrealized Losses

Review your portfolio for crypto assets whose current market value is below your cost basis. These are your unrealized losses — they only become tax-relevant when you sell and "realize" the loss.

For example, if you bought 1 ETH at $3,000 and it is now worth $2,000, you have a $1,000 unrealized loss. Under IRS Publication 544, a loss is not deductible until the property is sold or otherwise disposed of.

Step 2: Sell Before Year-End

To claim the loss on your current year's tax return, you must complete the sale by December 31. The IRS uses the trade date — not the settlement date — for determining when a transaction occurred. Ensure your sell order executes before midnight on December 31 in your time zone.

Step 3: Offset Gains

Your realized losses offset your realized gains in this order, per IRC Section 1(h) and IRS Publication 550:

Short-term losses first offset short-term gains (taxed at ordinary income rates of 10-37%)
Long-term losses first offset long-term gains (taxed at 0%, 15%, or 20%)
Remaining net losses of either type can offset gains of the other type
Net capital loss up to $3,000 ($1,500 if married filing separately) can offset ordinary income

Step 4: Carry Forward Excess Losses

If your net capital losses exceed the $3,000 annual limit, the excess carries forward to future tax years indefinitely under IRC Section 1212(b). You can use carryforward losses to offset future capital gains or deduct $3,000 per year against ordinary income until the loss is fully consumed.

The $3,000 Annual Deduction Limit

One of the most misunderstood aspects of tax loss harvesting is the $3,000 limit. This limit applies only to net capital losses deducted against ordinary income. There is no limit on using capital losses to offset capital gains.

Example Scenario

Suppose in 2025 you have:

$50,000 in capital gains from selling Bitcoin
$80,000 in capital losses from selling altcoins

Your $80,000 in losses fully offsets your $50,000 in gains (no limit here), leaving you with a $30,000 net capital loss. Of that remaining $30,000, you can deduct $3,000 against your ordinary income (salary, wages, etc.) in 2025. The remaining $27,000 carries forward to 2026 and beyond.

Per IRS Schedule D instructions, this carryforward is reported on the Capital Loss Carryover Worksheet in the Schedule D instructions for the subsequent year.

Short-Term vs. Long-Term Considerations

Tax loss harvesting is most valuable when you can offset short-term gains with losses, because short-term gains are taxed at higher ordinary income rates (up to 37% for the 2025 tax year under IRC Section 1(j)).

Strategic Timing

If you have both short-term and long-term unrealized losses, prioritize harvesting short-term losses first if you have short-term gains to offset. The tax savings from offsetting a short-term gain taxed at 37% are significantly greater than offsetting a long-term gain taxed at 15% or 20%.

However, if you have held an asset for close to 12 months, consider whether waiting for it to cross the long-term threshold might be advantageous — long-term losses still offset long-term gains dollar for dollar, and can cross over to offset short-term gains if needed.

The Wash Sale Question for Crypto

The wash sale rule under IRC Section 1091 prevents taxpayers from claiming a loss on a security if they purchase a "substantially identical" security within 30 days before or after the sale. Historically, cryptocurrency has not been classified as a "security" for purposes of this rule — the IRS defines wash sale securities as stocks, bonds, options, and similar instruments.

Current Status (2025-2026)

As of the 2025 tax year, the IRS has not formally extended the wash sale rule to cryptocurrency. This means you can technically sell Bitcoin at a loss and immediately repurchase it, claiming the loss on your tax return. This is a significant advantage that crypto investors have over stock investors.

The PARITY Act and Future Changes

The Providing Accountability and Reporting for Tax on Investments in Digital Assets Realizing Yesteryear (PARITY) Act, introduced in Congress, would extend the wash sale rule to digital assets. If enacted, repurchasing the same or substantially identical cryptocurrency within 30 days of a loss sale would disallow the loss deduction, matching the treatment of securities.

Even without the PARITY Act, the IRS could extend wash sale rules to crypto through administrative guidance. Taxpayers should consider the risk that retroactive enforcement is unlikely but future rule changes may limit this strategy.

Best Practice

While the wash sale rule does not currently apply to crypto, consider documenting your intent and strategy. If you sell and immediately repurchase, maintain clear records showing the transactions and your reasoning. dTax flags potential wash sale scenarios in its reports so you can make informed decisions.

Advanced Tax Loss Harvesting Strategies

Harvesting Across Exchanges

If you hold the same asset on multiple exchanges with different cost bases, you can strategically sell from the exchange where your cost basis is highest (resulting in the largest loss). Under Specific Identification (IRS FAQ Q39), you can designate which specific lots you are selling, rather than defaulting to FIFO.

Replacing with Correlated Assets

Even though the wash sale rule does not currently apply, some investors prefer to replace a sold asset with a correlated but different asset to maintain market exposure. For example, selling ETH at a loss and buying SOL — both are smart contract platforms with correlated price movements. This approach provides the tax benefit while maintaining similar portfolio exposure.

Year-Round Monitoring

Tax loss harvesting is not just a December activity. Monitoring your portfolio throughout the year allows you to harvest losses during market downturns when they are largest. A significant market drop in March could provide better harvesting opportunities than a sideways market in December.

dTax's portfolio tracking features help identify unrealized gains and losses in real time, so you can act on harvesting opportunities as they arise.

Lot-Level Optimization

Using Specific Identification as your cost basis method gives you the flexibility to choose which lots to sell. You might hold 5 BTC purchased at different prices over time. Selling the specific lot with the highest cost basis maximizes your loss (or minimizes your gain). Per IRS FAQ Q39, Specific Identification requires adequate identification of the units sold at the time of the transaction.

Record-Keeping Requirements

The IRS requires adequate records to substantiate capital losses. Per IRC Section 6001, taxpayers must keep records sufficient to establish the amount of gross income, deductions, and credits. For crypto tax loss harvesting, this means:

Date and time of each purchase and sale
Cost basis for each asset (including fees)
Fair market value at time of sale
Identification of specific lots if using Specific Identification
Exchange or platform where the transaction occurred

dTax maintains all of these records automatically when you import your exchange data, providing an audit-ready trail for every harvested loss.

Common Mistakes to Avoid

Harvesting Losses Without Considering Total Tax Impact

Selling at a loss resets your cost basis. If you repurchase at a lower price, your future gains will be larger because your new cost basis is lower. Tax loss harvesting shifts the tax burden rather than eliminating it entirely — the benefit is the time value of the deferred tax payment.

Ignoring Transaction Fees

Selling and repurchasing an asset incurs trading fees. Ensure the tax savings from the harvested loss exceed the costs of executing the trades. For small unrealized losses, the fees may not justify the harvest.

Missing the Year-End Deadline

Transactions must settle by December 31 to count for the current tax year. Submit sell orders early enough to avoid execution delays, especially during periods of high market volatility when exchanges may experience congestion.

Frequently Asked Questions

Can I sell crypto at a loss and immediately rebuy it?

Under current IRS rules, yes. The wash sale rule (IRC Section 1091) applies only to securities, and the IRS has not formally classified cryptocurrency as a security for wash sale purposes. You can sell crypto at a loss, claim the deduction, and repurchase immediately. However, pending legislation like the PARITY Act could extend wash sale rules to digital assets in the future.

How much crypto loss can I deduct?

There is no limit on using crypto losses to offset capital gains. If your losses exceed your gains, you can deduct up to $3,000 of net capital loss per year against ordinary income ($1,500 if married filing separately) under IRC Section 1211(b). Any excess carries forward indefinitely to future tax years under IRC Section 1212(b).

Does tax loss harvesting work for cryptocurrency?

Yes, tax loss harvesting is particularly effective for cryptocurrency because of the market's volatility and the current absence of wash sale restrictions. The strategy works by selling assets at a loss to offset gains, reducing your current-year tax liability. dTax helps identify unrealized losses across your portfolio and calculates the optimal lots to sell under your chosen cost basis method.