Losses are the mirror image of gains in crypto tax — same formula, same disposal logic — but they get far less attention, and sitting on unrealized losses without a plan is a missed opportunity most holders don't think to act on until it's too late in the tax year.
A Loss Follows the Same Formula as a Gain
Every disposal — selling, swapping, or spending crypto — triggers a capital gain or loss calculated as proceeds minus cost basis. When that number comes out negative, it is a realized capital loss, and in most jurisdictions realized losses can be used to offset gains elsewhere in your portfolio for the same tax year. The mechanics are identical to a gain calculation; only the sign changes.
Timing Restrictions on Repurchasing
Several jurisdictions restrict how quickly you can repurchase the same or an identical asset after realizing a loss on it, specifically to prevent claiming a loss while your economic position stays effectively unchanged. Canada's superficial-loss rule, for example, disallows a loss if you repurchase the same asset within 30 days before or after the disposal. If you are harvesting a loss deliberately, know your jurisdiction's specific timing rule before repurchasing anything you just sold, since triggering the restriction can disallow the very loss you were trying to claim.
When an Asset Becomes Worthless, Not Just Down
A distinct situation from an ordinary loss: if a token becomes genuinely worthless — a de-pegged stablecoin that never recovers, or a project that collapses entirely — you may be able to claim a capital loss on the basis that the asset has no remaining value and is not expected to recover. This requires real documentation: evidence of the collapse or de-pegging event and the token's subsequent abandonment, not just a price chart showing it near zero.
Harvesting Losses Deliberately, Not Accidentally
The strategic version of all this is using realized losses deliberately to offset gains in a high-income year, rather than only discovering a loss position after the fact. This means reviewing your actual positions before year-end, identifying which are sitting at a genuine loss, and deciding intentionally whether realizing that loss now serves your tax position — while keeping the repurchase timing restrictions in mind so the loss actually holds up.
Where to Go From Here
The Crypto Tax Reporting & Compliance Guide covers the full cost-basis methods by country, the record-keeping that supports a loss claim if challenged, and the year-round maintenance habits that make year-end loss review straightforward rather than a scramble.
Get The Crypto Tax Reporting & Compliance Guide →
This article is for educational and informational purposes only and does not constitute tax advice. Loss claim rules and repurchase restrictions vary by jurisdiction — consult a qualified tax professional for your own situation.