Can Investment Losses Actually Lower Your Tax Bill?
Most investors focus entirely on what their portfolio earns. But what really matters isn't what you earn. It's what you keep after taxes. Tax-loss harvesting is one of the most practical and underused strategies for reducing your tax bill without changing your long-term investment approach.
The idea is straightforward. Investments that are down in value can be sold strategically to offset gains elsewhere in your portfolio, reducing what you owe in taxes. In one illustrative example we walk through in this video, a single strategic move before year-end could save over $11,000.
Tax-loss harvesting is one piece of a broader tax-efficient retirement strategy. You may also find our video on the retirement tax mistake most people miss helpful for understanding how investment decisions interact with your overall retirement tax picture.
How Tax-Loss Harvesting Actually Works
When you sell an investment for a profit, you owe capital gains tax on that gain. Tax-loss harvesting addresses this by identifying other investments in your portfolio that are currently sitting at a loss and selling those positions strategically to offset the gain.
The key is that you don't have to abandon the investment position entirely. Once you sell the losing position, you can reinvest in a similar but not identical fund, so you stay invested in the market while locking in the tax benefit. The strategy preserves your market exposure while reducing your tax bill.
How Tax-Loss Harvesting Can Offset a Short-Term Capital Gain
Imagine an investor who sold an investment and generated approximately $30,000 in short-term capital gains. In a higher tax bracket, that gain could create a tax bill of over $10,000. A review of the portfolio identified other investments sitting at a loss.
By strategically selling those losing positions before year-end, the gain could be offset and the amount owed dramatically reduced. In this example, the strategy could save over $11,000.
This is a hypothetical, illustrative example and not specific tax or investment advice. Consult your tax advisor regarding your individual situation.
The Rules You Need to Know
Tax-loss harvesting isn't simply selling whatever is down. There's a specific order to how losses are applied.
Short-term losses must offset short-term gains first. Long-term losses must offset long-term gains first. Only after that can losses cross over and offset the other type. If your total losses exceed your total gains, you can use up to $3,000 per year of the remaining losses to offset ordinary income. Any losses beyond that don't disappear. They carry forward indefinitely and can be used in future years until they're fully utilized.
The Wash Sale Rule: Where Most People Get This Wrong
The wash sale rule is the most common mistake in tax-loss harvesting. If you sell an investment at a loss and buy back the same investment, or something the IRS considers substantially identical, within 30 days before or after the sale, your loss is disallowed. That's a 61-day window you have to watch closely.
This is why replacing a losing position with a similar but not identical fund is so important. You stay invested in the market and maintain your overall exposure without triggering the wash sale rule and losing the tax benefit you just tried to capture.
For a deeper look at how investment decisions interact with tax planning, see our video on why account structure matters as much as account balance in retirement .
The Bonus Strategy: Tax-Gain Harvesting in Low-Income Years
There's a flip side to this strategy that's just as valuable in the right circumstances. In years when your income is lower, perhaps the year you retire, a year between jobs, or the gap years before Social Security and required minimum distributions both begin, you may fall into the 0% long-term capital gains bracket.
In that situation, it can make sense to do the opposite: sell investments that have grown, lock in the gain at 0% tax, and reset your cost basis higher, all without owing anything. This is called tax-gain harvesting, and it's one of the most overlooked strategies for people in a lower-income year.
The 0% bracket thresholds shift each year with inflation, so confirming the numbers before acting is essential. But for the right situation, tax-gain harvesting can create meaningful long-term tax savings.
Who This Matters Most For
Tax-loss harvesting is most valuable for higher-income investors and retirees with taxable investment accounts, where capital gains rates are highest and the offset opportunity is largest. But it isn't only a year-end strategy. Markets move throughout the year, and the best harvesting opportunities often appear during periods of volatility, not just in December.
The action steps: review your portfolio for positions sitting at a loss. Understand the offset order. Watch the 61-day wash sale window. And check whether a 0% bracket year is approaching where tax-gain harvesting makes sense instead.
Frequently Asked Questions About Tax-Loss Harvesting
What is tax-loss harvesting?
Tax-loss harvesting is the practice of selling investments that are currently at a loss to offset capital gains elsewhere in your portfolio, reducing your overall tax bill. After selling the losing position, you can reinvest in a similar but not identical fund to maintain your market exposure. The strategy captures a tax benefit without requiring you to exit your investment approach. It's most valuable in taxable investment accounts where capital gains taxes apply.
How much can tax-loss harvesting save?
The savings depend on the size of your gains, your tax bracket, and the losses available to offset them. In higher tax brackets, short-term capital gains are taxed as ordinary income, which can push the tax cost of a gain significantly higher. One industry study found tax-loss harvesting can add up to 1.8% per year in after-tax return. In a hypothetical example, an investor with a $30,000 short-term gain in a higher bracket could save over $11,000 through strategic harvesting of existing losses. Individual results vary based on portfolio composition, tax situation, and timing.
What is the wash sale rule?
The wash sale rule prohibits claiming a tax loss if you buy back the same investment, or one the IRS considers substantially identical, within 30 days before or after the sale. That's a 61-day window total. If the wash sale rule is triggered, the loss is disallowed and added back to the cost basis of the repurchased investment. This is why tax-loss harvesting typically involves replacing the sold position with a similar but not identical fund, preserving market exposure without violating the rule.
How are tax losses applied against gains?
The IRS requires losses to be applied in a specific order. Short-term losses must first offset short-term gains. Long-term losses must first offset long-term gains. Only after same-type offsetting is complete can remaining losses cross over to offset the other type. If total losses exceed total gains, up to $3,000 of net losses per year can be applied against ordinary income. Any remaining unused losses carry forward indefinitely to future tax years.
What is tax-gain harvesting and when does it make sense?
Tax-gain harvesting is the opposite of tax-loss harvesting. In years when your income is lower and you fall into the 0% long-term capital gains bracket, it can make sense to sell appreciated investments, capture the gain at 0% tax, and reset your cost basis to the current higher value. This strategy can reduce future capital gains taxes when you eventually sell those positions in a higher-income year. It's particularly relevant in the gap years between retirement and the start of Social Security and required minimum distributions. The 0% bracket thresholds change annually with inflation, so confirming eligibility before acting is important.
When is the best time to do tax-loss harvesting?
Tax-loss harvesting is commonly associated with year-end planning, but the best opportunities often appear during periods of market volatility throughout the year. Waiting until December means potentially missing significant harvesting windows that opened and closed during earlier market movements. Reviewing your portfolio for harvesting opportunities whenever the market experiences meaningful declines, not just at year-end, tends to produce better results over time.
Does tax-loss harvesting work in retirement accounts?
No. Tax-loss harvesting only applies to taxable investment accounts like brokerage accounts. Transactions inside IRAs, 401(k)s, and other tax-deferred or tax-free accounts don't generate capital gains or losses for tax purposes since those accounts have their own tax treatment. The strategy is specifically designed for taxable accounts where capital gains taxes apply to realized gains.
Can you carry forward unused investment losses?
Yes. If your capital losses in a given year exceed your capital gains, and after applying up to $3,000 against ordinary income you still have losses remaining, those losses carry forward to future tax years. They retain their short-term or long-term character and can be used indefinitely until fully utilized. Keeping track of carryforward losses from year to year is an important part of ongoing tax planning for investors with taxable accounts.
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Investment advice is offered through Bayntree Wealth Advisors, LLC, an SEC-registered investment adviser. Insurance and annuity products are offered separately through Bayntree Planning Group, LLC. Bayntree does not provide, and no statement contained herein shall constitute, tax or legal advice. You should consult a tax or legal professional on any such matters. Opinions expressed herein are solely those of Bayntree Wealth Advisors. All content is for informational purposes only and is not intended to provide the basis for any financial decisions.
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