What is tax-loss harvesting?

What is tax-loss harvesting?

Tax-loss harvesting is selling an investment at a loss to offset capital gains and cut your tax bill. You reinvest in a similar asset to stay invested and balanced. A paper loss becomes a real tax advantage.

If you sell a loser for a $1,000 loss and a winner for a $1,000 gain, the two cancel out and you owe zero tax on the winner. That's the core move: sell at a loss, bank it, stay invested. Every tax dollar saved gets reinvested and compounds.

How does harvesting reduce your taxes?

Every dollar of loss offsets a dollar of capital gain. If losses beat your gains, the leftover offsets up to $3,000 of ordinary income yearly, or $1,500 if married filing separately. That covers wages, interest, dividends, and business profit. Beyond that, losses carry forward.

Example: You have a $2,000 gain and a $1,500 loss. Harvest the loss and you net a $500 taxable gain instead of the full $2,000. That cut is real cash in your pocket from a holding that went down.

Short-term gains are taxed at higher rates than long-term gains. Harvesting losses first against short-term gains saves more, because those are the most expensive gains to have, so they are the first gains worth erasing.

The size of the benefit rides on your marginal tax bracket and where you live. Each harvested dollar erases gain taxed at your top rate, and state and local taxes stack on top. A higher bracket in a high-tax state makes the same loss worth more.

The value is not in the loss itself, because that money is already gone. The value is in the tax relief, which is fresh money you would otherwise hand to the government.

Is tax-loss harvesting the same as selling at the bottom?

No, and the difference is the whole point. You harvest a loss to reset its cost basis while reinvesting into a similar asset you keep owning, so you maintain allocation and stay invested. Turn a down year into a tax-planning opportunity, not a defeat.

Selling at the bottom means exiting and leaving the market, locking in the decline with nothing to show for it. Harvesting swaps one holding for a near-relation, staying invested, turning the dip into a tax loss, and positioning yourself to benefit if the market recovers.

What are the rules that keep you honest?

The biggest is the wash sale rule. If you sell a losing investment and buy a substantially identical one within 30 days before or after the sale, the loss is disallowed for tax purposes, destroying the benefit you were after. You must step away or buy something meaningfully different.

That rule punishes the most common mistake: selling a fund to harvest the loss, then buying the identical fund back a week later thinking you are clever. The tax code closes exactly that loophole. Wait out the window, or buy a similar-but-not-identical fund.

Using ETFs that track the same index works. Sell one S&P 500 index ETF at a loss, buy a different S&P 500 index ETF. They are not substantially identical, so the loss counts and you stay invested.

Also mind your holding period so you do not trade a long-term win into a short-term tax bill, and check transaction costs, since heavy trading fees can eat the tax savings you gain.

Should you harvest losses in your own portfolio?

Yes, in taxable accounts, whenever you have losses and gains to offset, and most sharply in years when you realize big gains, since a loss there cancels the largest taxable amount.

It is one of the few tax moves that costs you little, keeps you invested, and puts real money back. Pair it with annual rebalancing, since the laggards that need trimming are your harvest candidates. For anyone with a taxable brokerage account, it is a habit worth building.

The caveat is where. In a tax-advantaged account like an IRA, there are no capital gains taxes to offset, so harvesting has nothing to do there, and the wash-sale rule still applies across accounts. Target the taxable account where the benefit lives.

And keep it disciplined, not frantic. Harvest only to reduce taxes, not as an excuse to trade. Do it cleanly, respect the wash rules, reinvest in something similar, and let the tax savings quietly compound alongside the rest of your plan.

Most investors skip it for reasons that have nothing to do with math. Mental accounting treats returns and tax payments as separate buckets, so the link feels invisible. And people hate selling a loser, hoping it recovers.

Are you deferring tax, not dodging it?

Harvesting defers tax; it does not erase it. Your replacement shares carry a lower cost basis, so the deferred gain resurfaces when you eventually sell them. The government is simply waiting for you later. Choose specific-lot accounting, not average cost, so you sell the exact losing shares.

Unused losses pile up and carry forward with no expiration date, ready for a future big gain. And if you hold until death, your heirs get a stepped-up basis that can wipe out the entire deferred bill, a quiet edge most sellers never stop to consider.