Tax-loss harvesting is usually framed as a free year-end tax break, but its value depends on a handful of rules rather than the label. The maneuver is straightforward: sell an asset that has fallen below what you paid for it, realize the loss on paper, and apply it to this year’s tax bill. What decides whether the trade is worth doing is how losses net against gains, how much ordinary income a net loss can offset, and whether the asset you sold is a coin or a fund share.
The loss has to be realized first
A coin bought for $12,000 and now worth $5,000 produces a $7,000 deduction only when it is sold, swapped for another coin, or spent. Harvesting also defers tax rather than erasing it: buy the coin back at $5,000 and that lower price becomes the new cost basis, so a later recovery to $12,000 shows up as a $7,000 gain in a future year.
How losses net, and where the $3,000 cap sits
The IRS treats crypto as property, so the capital-gain rules apply. Short-term losses offset short-term gains first and long-term losses offset long-term gains, then a net result from one group offsets the other. Whatever net loss remains can reduce up to $3,000 of ordinary income each year, $1,500 if married filing separately, and the rest carries forward. The order matters because short-term gains are taxed at ordinary rates up to 37% while long-term gains top out at 20%, so a loss is worth the most when it cancels a short-term gain.
The wash-sale line: coins versus fund shares
The wash-sale rule disallows a loss when you buy substantially identical stock or securities within 30 days before or after the sale. Coins held directly are not securities under current law, so selling and rebuying the same coin right away does not trigger the rule. Spot bitcoin ETF shares are treated like stock, so the same round trip defers the loss into the replacement shares’ basis instead. A buyback inside an IRA is worse: the loss is disallowed and never added to the IRA’s basis, so it is gone.
The caveat that keeps the strategy honest
Even without a wash-sale rule, the IRS can disregard a transaction that lacks economic substance. A sale and repurchase of the same coin seconds apart leaves your position almost unchanged, which is why some tax professionals advise against it. Holding a different asset, or staying out for at least 31 days, puts real market risk on the trade and makes its non-tax purpose easy to show. A 31-day gap also guards against a pending bill that would extend the wash-sale rule to crypto sold after mid-September 2026 if it becomes law; as of late October 2026 that bill is still a proposal, not law.
Getting the loss onto the return
Each sale goes on Form 8949, with totals carried to Schedule D. The weak point is usually basis: coins bought before 2026 and held outside a covered custodial account often arrive without reported basis, so the loss exists only if your own records do. A sale must execute by December 31, 2026 to count for 2026, so keep the confirmation showing the date, time, units, and price.
Source: BTCUSA.