Capital Gains 0% Bracket Strategy

Did you know there’s a tax bracket where long-term gains are taxed at zero? Not deferred. Zero. For 2026, a married couple pays 0% federal tax on long-term capital gains and qualified dividends until total taxable income reaches $98,900, and a single filer until $49,450. Most people never use it because they only sell when they need cash, and by then their income is too high. The retirees who plan around it harvest gains on purpose in low-income years and reset their cost basis for free.

How the 0% rate actually works

Capital gains stack on top of your ordinary income. So the room in the 0% bracket is whatever’s left after your wages, pension, IRA withdrawals, and the taxable part of Social Security fill the bottom. For 2026, the long-term gain rate is 0% up to $98,900 of taxable income for a couple, 15% from there to $613,700, and 20% above that. The 0% layer isn’t a separate allowance. It’s the space under that first breakpoint that your ordinary income hasn’t already claimed.

That’s why the strategy lives in low-income years. After you retire and before Social Security and RMDs start, your ordinary stack can be short, leaving real room under $98,900. Sell appreciated stock into that room, pay zero on the gain, then rebuy the same shares immediately, because there’s no wash-sale rule on gains. You’ve reset your basis higher at no tax cost, which shrinks every future sale. It’s the rare move with a tax bill of exactly nothing.

A worked example

Take a couple, both 63, retired, with $50,000 of taxable income from dividends and interest and no other income. After the standard deduction their taxable income is well under the breakpoint, leaving roughly $60,000 of room in the 0% gains bracket. They sell index funds with $60,000 of long-term gain, owe no federal tax on it, and rebuy the same funds that afternoon. Their basis is now $60,000 higher. If they sell those shares in a future high-income year, the taxable gain is $60,000 smaller. They’ve moved gain out of a future 15% or 20% year and recognized it at 0% instead.

Do this across several low-income years and the basis step-ups compound. A retiree who harvests gains every year from 62 to 70 can quietly reset the basis on a large taxable portfolio, dollar by dollar, all at zero federal tax.

The tension you have to resolve

Here’s the catch that decides everything. The 0% gains room and your Roth conversion room come from the same pool. A conversion is ordinary income, so it fills the bottom of the stack and pushes your gains up out of the 0% layer. You generally can’t max both in the same year. So each low-income year you choose: harvest gains at 0%, or convert at 12%. The right answer depends on whether your bigger long-term threat is a concentrated taxable position or a giant tax-deferred balance heading for big RMDs.

There’s also a quiet toll to watch. Even when the federal gain rate is 0%, recognizing the gain raises your MAGI, which can lift your IRMAA Medicare surcharge and feed the 3.8% net investment income tax. For most people in the 0% band those don’t bite, because the income is low by definition, but check before you harvest a large amount in a year you’re already near a threshold.

If your portfolio is large

For households with $3M or more, the 0% bracket is usually too narrow to matter much by itself, because other income fills it fast. The bigger lever for the wealthy is the step-up in basis. Assets held until death pass to heirs with the gain erased entirely, which is a better outcome than harvesting at 0% during life. So the most appreciated lots are often the ones to keep, while the 0% harvest is best aimed at positions you want to unwind anyway, like a concentrated stock you’re diversifying out of. Use the zero rate to reduce a position you were going to sell, not to churn assets you’d have held forever.

The 0% capital-gains bracket is a genuine gift the tax code hands low-income years, and most retirees let it expire unused. Find the room, harvest into it on purpose, and reset your basis for free. For the harvest in the wider context of your brokerage account, see capital gains harvesting in retirement.