Tax loss harvesting (TLH) is the practice of strategically selling assets that have declined in value to generate realized losses that offset capital gains (or ordinary income, subject to limits). In traditional investing, the wash sale rule limits this strategy for 30 days before/after the sale. Crypto's current exemption from wash sale rules makes TLH far more powerful — you can crystallize losses and maintain your exact position simultaneously.
How Crypto Tax Loss Harvesting Works
The basic mechanism: you hold 1 ETH purchased at $3,000, now trading at $2,000. You have a $1,000 unrealized loss. Selling crystallizes the $1,000 loss as a realized capital loss. Immediately buy back 1 ETH at $2,000. Net position: same 1 ETH, same market exposure. But now you have a $1,000 realized loss to offset against gains. The cost basis for your new ETH is $2,000 — if ETH later returns to $3,000, you'll owe capital gains taxes on $1,000, but you deferred that tax and potentially converted it from short-term to long-term rate (if you hold the new position >1 year).
Offsetting rules (US): capital losses first offset capital gains of the same type (short-term losses offset short-term gains, long-term losses offset long-term). Then they cross-offset: long-term losses against short-term gains (but you 'waste' the lower rate benefit). Any remaining losses can offset ordinary income up to $3,000/year. Unused losses carry forward indefinitely. In a year with $50,000 in crypto gains, harvesting $50,000 in losses entirely eliminates the tax — very significant.
Year-end TLH strategy: the most impactful time is November-December — you know your realized gains for the year, and can calculate exactly how much loss-harvesting would reduce your tax bill. Scan your portfolio for unrealized losses. Prioritize harvesting losses in assets that have declined significantly with unclear recovery timeline. Avoid harvesting losses in assets you believe are about to recover significantly — timing matters.
- ✓No wash sale rule for crypto (US): sell at loss, immediately rebuy — loss still deductible
- ✓Capital loss offset: directly reduces capital gains dollar-for-dollar
- ✓Ordinary income offset: up to $3,000/year in losses offset ordinary income
- ✓Loss carryforward: unused losses carry forward indefinitely to future years
- ✓Cost basis reset: new position has higher cost basis, deferring future taxes
- ✓Year-end timing: most impactful October-December when annual gains are known
Advanced TLH Strategies and Limitations
Same-day rebuy strategy: sell BTC, immediately buy BTC. Works because no wash sale rule. However: the spread and any fees eat into your savings — ensure the tax savings exceed transaction costs. For large losses (>$10,000), transaction costs are trivial. For small losses ($500), fees may consume the benefit. Also: the crypto could spike between sell and rebuy — minimize this window with limit orders on the same exchange.
Substitute crypto strategy: for smaller losses, instead of exact rebuy, buy a highly correlated crypto. Sell ETH at a loss, buy a large-cap ETH-correlated altcoin immediately, then swap back after 31+ days (maintaining wash sale safety margin even though not legally required for crypto, it future-proofs your position if regulations change). This eliminates any gap-risk during the holding period.
DeFi-specific considerations: LP positions in DeFi create complex TLH opportunities. Removing liquidity from a declining pool crystallizes losses on the underlying assets. Conversely, impermanent loss in DeFi creates realized losses when removing liquidity that can offset other gains. DeFi TLH is more complex — tax software may misclassify these events. Always review DeFi-related harvested losses with a tax professional.
- ✓Same-day rebuy: sell and immediately rebuy identical crypto — valid strategy
- ✓Transaction cost hurdle: tax savings must exceed fees + spread
- ✓Substitute asset: sell declining token, buy correlated crypto, swap back later
- ✓DeFi TLH: LP removal crystallizes losses — complex but valid strategy
- ✓Stablecoin exit: if bearish, sell to stablecoin (harvest loss) rather than HODL
- ✓Wash sale warning: Congress may extend wash sale rules to crypto — act while current exemption exists
Frequently Asked Questions About Crypto Tax Loss Harvesting
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