Nobody likes losing money. But what if I told you that an investment sitting in the red could be quietly doing you a favor every April? There is a perfectly legal strategy, used by everyone from first-time investors to family offices, that turns paper losses into real tax savings. It is called tax-loss harvesting, and with markets this volatile, it deserves a plain-English explanation.
Here is the core idea, stripped of jargon. When you sell an investment for less than you paid, you realize a capital loss. The tax code lets you use that loss to offset capital gains you realized elsewhere. Sold a stock for a $10,000 profit and another for a $4,000 loss? Your taxable gain drops to $6,000. The loss did not disappear. It went to work.
How the math works. Capital losses offset capital gains dollar for dollar, with no limit. If your losses exceed your gains, you can deduct up to $3,000 of the excess against your ordinary income each year ($1,500 if you are married filing separately), and carry the rest forward indefinitely to future years, per IRS Topic 409. That carryforward never expires. A $70,000 loss carryforward could wipe out a $50,000 gain entirely, with $20,000 left to use later.
A concrete example: imagine you harvest a $100,000 loss and use it to offset long-term gains. For 2026, long-term gains are taxed at 0%, 15%, or 20%, and high earners face an additional 3.8% Net Investment Income Tax. At the top 23.8% combined rate, that single harvest saves $23,800 in federal taxes alone. In a high-tax state, total savings can exceed $30,000.
The wash-sale rule: the one tripwire. You cannot sell a stock at a loss on Monday and buy it right back on Tuesday and claim the loss. Under the wash-sale rule, the loss is disallowed if you buy the same or a “substantially identical” security within 30 days before or after the sale, a 61-day window including the sale date, as the IRS explains. The fix is simple: immediately buy a similar-but-not-identical replacement, like swapping one S&P 500 index fund for a total-market fund from a different issuer, so your portfolio stays invested while the loss counts.
It is not just for stocks anymore. This is the timely part. With the 10-year Treasury yield near its highest level since 2007 and bond prices down, many investors hold bond funds bought at lower yields that now show unrealized losses. Major bond ETFs have declined more than 3.5% this year, even as stock gains of roughly 13% created larger taxable gains to offset, per recent market coverage. Selling a losing bond position to offset stock gains, then buying a similar bond fund, is exactly the kind of harvesting professionals are doing right now.
The same logic extends to crypto, with a twist. Because the IRS treats virtual currency as property rather than a security (IRS Notice 2014-21), the wash-sale rule does not currently apply to crypto. You can sell a coin at a loss and rebuy it minutes later, as CoinLaw details. Congress has legislation aimed at closing that gap, so treat it as a window, not a permanent feature.
The details that decide whether it works. First, this only helps in taxable accounts. Losses inside IRAs and 401(k)s cannot be harvested, because those accounts are already tax-sheltered. Second, look at individual tax lots, not the whole position. Dividend reinvestments and multiple purchases over time mean some lots may show losses even when the overall fund is up. Your brokerage tracks cost basis lot by lot; check there before you assume there is nothing to harvest. Third, since January 2025, crypto investors must track basis on a per-wallet basis under IRS rules, which shapes exactly which lots you can sell.
When does it make sense for a regular household? You do not need a seven-figure portfolio. If you sold investments at a gain this year, perhaps rebalancing, trimming a winner, or selling a rental property, and you hold something at a loss in a taxable account, harvesting is worth a conversation with your tax preparer. It pairs naturally with year-end rebalancing: you were going to adjust the portfolio anyway, so you might as well do it in the way that costs the least in taxes.
A few cautions, offered in the spirit of honesty. Do not let the tax tail wag the investment dog: selling a good long-term holding just to book a loss is backwards. Watch out for state rules, which vary. And this is educational, not tax advice; a qualified professional who knows your situation is worth the fee.
Here is the reframe I want to leave you with. Most of us experience a losing investment as pure failure, something to hide from and hope recovers. Tax-loss harvesting asks a gentler question: given that this loss exists, what good can it do? It cannot undo the loss. But it can shrink the check you write to the IRS, keep your portfolio invested for the recovery, and turn a red number into a small act of financial stewardship. In a year when both stocks and bonds have given investors plenty of red ink to work with, that is a question worth asking before December arrives.
