Tax-Loss Harvesting: Turning Losses Into Tax Savings

Here's something most people don't know: when your investments lose money, you can use those losses to reduce your tax bill. It's called tax-loss harvesting, and it's one of the few ways the tax code actually works in your favor.

The idea is simple: if you sell an investment that's down, that loss can offset gains you made elsewhere. Made $5,000 on one stock and lost $2,000 on another? You only pay taxes on the $3,000 net gain. It's not about timing the market — it's about making the tax code work for you.

Let's say you bought $10,000 of Stock A and it grew to $15,000. If you sell, you have a $5,000 capital gain — and you owe taxes on it.

But you also own Stock B, which dropped from $10,000 to $8,000. If you sell Stock B at a loss, you have a $2,000 capital loss. That loss reduces your taxable gain: $5,000 gain minus $2,000 loss = $3,000 net gain. You just cut your tax bill by about $300-$400 (depending on your tax bracket).

Here's the best part: after you sell Stock B, you can immediately buy a similar (but not identical) investment to maintain your market exposure. You harvested the tax loss without changing your investment strategy.

The IRS has one important rule: you can't sell an investment at a loss and then buy back the exact same (or "substantially identical") investment within 30 days. This is called the wash sale rule.

The 30-day window applies both before and after the sale. That means if you buy shares on December 1st and sell them at a loss on December 15th, you can't buy them back until January 15th. If you violate this rule, the IRS disallows your loss deduction.

Important: The wash sale rule doesn't currently apply to cryptocurrency. But that may change as regulations evolve.

Tax-loss harvesting works best in taxable brokerage accounts. It doesn't apply to tax-advantaged accounts like IRAs or 401(k)s because you don't pay taxes on gains in those accounts anyway.

Pro tip: Many robo-advisors (like Betterment and Wealthfront) automate tax-loss harvesting for you. They monitor your portfolio daily and harvest losses automatically while avoiding wash sales. If you have a large taxable account, this feature alone can be worth the management fee.

Sarah invested $50,000 in a tech fund in 2025. By December, it had dropped to $42,000 — an $8,000 loss. Earlier in the year, she sold some other investments and realized $12,000 in capital gains.

Sarah sells the tech fund, locking in the $8,000 loss. That loss offsets $8,000 of her $12,000 gain, so she only owes tax on $4,000 instead of $12,000. At a 15% capital gains rate, she saves $1,200 in taxes.

She waits 31 days, then buys back into a similar tech fund. Her portfolio is back on track, and she pocketed a $1,200 tax benefit. That's tax-loss harvesting in action.

Tax-loss harvesting isn't about avoiding taxes forever — it's about deferring them and keeping more money invested. The losses you harvest today reduce your tax bill now, giving you more capital to compound over time. That's the real win.