Tax-Loss Harvesting in Retirement: Turning Market Dips Into Tax Savings

Nobody enjoys watching their portfolio drop. But here’s something I tell nervous clients during every market dip: a paper loss in a taxable brokerage account isn’t just a number on a statement, it can be a tool. Used well, it can quietly trim your tax bill for years. The strategy is called tax-loss harvesting, and far too many retirees either ignore it or assume it’s only for high-earning professionals still in their working years.

A Mesa couple I worked with came to me right after a rough stretch in the markets, anxious about how much their accounts had fallen. When we looked together, I pointed out that several of their funds were sitting below what they’d paid, and that those losses were worth real money if we handled them correctly. Instead of just riding it out and hoping, we put those losses to work. By the end of that year they’d offset a sizable taxable gain elsewhere and carried extra losses forward. The market eventually recovered; the tax benefit was permanent.

What Tax-Loss Harvesting Actually Is

Tax-loss harvesting means deliberately selling an investment that’s worth less than you paid for it, locking in the loss for tax purposes, and then reinvesting the proceeds so you stay in the market. The loss you realize can be used to offset capital gains, and if you have more losses than gains, you can use a limited amount each year to offset ordinary income, with any leftover losses carried forward indefinitely to future years.

This only applies to taxable brokerage accounts. Losses inside an IRA, 401(k), or Roth don’t count, because those accounts are already shielded from year-to-year taxation. So if all your money is in retirement accounts, this strategy simply isn’t on the table, which is one reason holding some assets in a taxable account can be valuable in retirement.

How the Losses Get Used

There’s a specific order to how harvested losses are applied:

• First, losses offset capital gains of the same type (short-term against short-term, long-term against long-term), then against the other type.
• If losses exceed your gains, a limited amount, currently a few thousand dollars per year (a figure that has been the same for a long time, but always confirm the current rule), can offset ordinary income like IRA withdrawals or pension payments.
• Anything left over carries forward to future years with no expiration. You don’t lose it.

That carryforward feature is underappreciated. A retiree who harvests a large loss in a bad market year can bank it and use it to neutralize gains for years to come, including gains generated when they eventually rebalance or sell an appreciated holding for income.

The Wash-Sale Rule: The One Trap to Avoid

Here’s the rule that trips people up. The IRS won’t let you claim a loss if you buy back the same or a “substantially identical” security within 30 days before or after the sale. That’s the wash-sale rule, and it exists to stop people from selling purely for the tax break while never really leaving their position.

The fix is straightforward but requires care: when you harvest a loss, reinvest the proceeds into a similar but not identical investment. For example, you might sell one broad U.S. stock index fund and buy a different fund family’s broad U.S. stock fund that tracks a different index. You stay invested with comparable market exposure, but you’ve sidestepped the wash-sale problem.

A few things people forget: the rule looks across all your accounts, including your spouse’s and even your IRA. So an automatic dividend reinvestment or a 401(k) purchase of the same fund within that window can accidentally trigger a wash sale. This is exactly the kind of detail that benefits from a steady hand coordinating the whole picture.

When It Actually Helps a Retiree

Tax-loss harvesting isn’t universally valuable, it depends on your situation. It tends to help most when:

• You hold appreciated positions you’ll eventually need to sell for income, and banked losses can offset those gains later.
• You’re doing ongoing rebalancing and want to trim winners without a big tax hit.
• You have a concentrated or low-basis holding you’d like to unwind gradually, harvested losses can absorb some of the gain as you diversify.
• You’re in a higher-income year, perhaps from RMDs or a property sale, where offsetting gains carries more weight.

It helps less if your income is unusually low. In a very low-income year, you might actually prefer the opposite move, harvesting gains in the 0% bracket rather than losses. The two strategies pull in different directions, and which one fits depends on your bracket that year. You can sketch out the trade-offs with our retirement planning calculators.

A Simple Illustration

Imagine a Scottsdale retiree who, during a market downturn, sells a stock fund that’s down roughly $40,000 from what she paid, and immediately reinvests in a comparable (not identical) fund. She’s still fully invested for the recovery. That $40,000 loss first wipes out a $25,000 gain she realized earlier in the year from rebalancing, then shelters a few thousand of ordinary income, with the remainder carried forward to use next year. The numbers here are illustrative, but the mechanics apply to anyone with losses in a taxable account.

A Word of Caution

Don’t let the tax tail wag the investment dog. Harvesting only makes sense if you stay invested with similar exposure, the goal is to capture the tax benefit, not to time the market or abandon your plan. Also keep an eye on your overall AGI, since selling can interact with Social Security taxation and IRMAA. And be aware that harvesting lowers your cost basis when you rebuy at a lower price, which can mean a larger gain later, so this is about timing and deferral, not magic.

This is also a place where the way your advisor is paid matters. A commission-based broker has little incentive to do the unglamorous, ongoing work of harvesting losses correctly across your accounts. A fee-only fiduciary advisor has no product to sell and is simply focused on keeping more of your money in your pocket.

The Bottom Line

Market dips are unpleasant, but in a taxable account they can hand you a genuine, permanent tax benefit if you act with intention and respect the wash-sale rule. Tax-loss harvesting can offset gains, shelter a bit of ordinary income, and build a reserve of carryforward losses for future years, all while keeping you invested. Because it interacts with your broader bracket and income picture, it’s worth doing thoughtfully rather than reactively. If you’d like help putting your losses to work without disrupting your plan, connect with a fee-only fiduciary advisor in Arizona who can coordinate it with the rest of your strategy.

Important Disclosures

This material is intended for informational and educational purposes only and should not be construed as individualized investment, tax, or legal advice. Consult your own qualified advisor before acting on anything discussed here.

Investing involves risk, including possible loss of principal. Tax rules change and outcomes vary by individual circumstances. Arizona Fee Only is a directory and does not provide investment, tax, or legal advice.