Married couples filing jointly can shield up to $96,700 in net long-term capital gains from federal tax for the 2025 tax year, a threshold set by annual inflation adjustments the IRS published in Rev. Proc. 2024-40. That zero-percent rate window will widen to $98,900 for 2026, giving households a concrete planning decision: realize gains now or wait for the slightly larger allowance next year.
How the $96,700 Zero-Rate Threshold Works for Joint Filers
The preferential rate structure for long-term capital gains and qualified dividends originates in 26 U.S. Code Section 1(h), which created the 0%, 15%, and 20% tiers and requires the IRS to index the breakpoints for inflation each year. For taxable years beginning in 2025, the IRS set the married-filing-jointly maximum zero-rate amount at $96,700, as published in the 2024 inflation tables within the Internal Revenue Bulletin. That figure represents the ceiling of taxable income, including net long-term gains and qualified dividends, below which a joint filer owes zero federal capital gains tax.
The practical effect is straightforward. A couple whose ordinary taxable income after deductions sits well below $96,700 can fill the remaining space with realized long-term stock gains and owe nothing on those gains at the federal level. If their total taxable income, including the gains, stays at or under $96,700, the entire gain falls in the zero-rate band. Once the total crosses that line, only the excess is taxed at 15%, up to a separate, much higher ceiling.
It is important to distinguish between long-term and short-term gains. As explained in the IRS overview of capital gains, assets held for more than one year generally qualify for the preferential long-term brackets, while assets sold after a year or less are taxed at ordinary income rates. The $96,700 threshold discussed here applies only to the net amount of long-term gains and qualified dividends layered on top of ordinary income, not to short-term trading profits.
The 2026 Adjustment and Why Timing Matters This Year
The IRS has already announced the next step in the inflation ladder. Rev. Proc. 2025-32, included in a 2026 adjustment package in Internal Revenue Bulletin 2025-45, raises the joint-filer zero-rate amount to $98,900 for tax year 2026 and sets the maximum 15% rate amount at $613,700. The agency’s press release, IR-2025-103, confirmed these figures as part of broader inflation updates to income tax brackets, standard deductions, and other thresholds.
The $2,200 gap between the 2025 and 2026 thresholds creates a narrow but real planning window. Couples whose taxable income already sits close to the $96,700 ceiling may find it worthwhile to harvest gains before December 31, 2025, locking in the zero rate on as much appreciation as the current band allows. Those with room to spare could instead wait until January 2026, when the higher $98,900 limit takes effect, to shelter an additional $2,200 in gains at zero percent.
The hypothesis that filers within roughly $10,000 of the threshold will accelerate realizations in the fourth quarter of 2025 is plausible on its face, but no IRS dataset or taxpayer-level study in the public record confirms whether that pattern actually plays out at higher rates than in prior years. The official publications describe the mechanics of the brackets but do not report how many households deliberately “fill up” the zero-rate band in response to announced future increases. That leaves advisers and taxpayers to apply the rules to their own balance sheets without a clear behavioral roadmap.
Coordinating Gains, Losses, and Other Income
Using the zero-percent band effectively requires looking beyond just the headline thresholds. The IRS guidance in Publication 550 explains how net capital gains are calculated after offsetting capital losses and how those net amounts interact with ordinary income on the tax return. A couple with both gains and losses may be able to harvest winners up to the zero-rate ceiling while realizing enough losses elsewhere in the portfolio to keep total taxable income under the limit.
Other income sources can complicate the picture. Taxable Social Security benefits, required minimum distributions from retirement accounts, and part-time wages all feed into taxable income and can crowd out room in the zero-rate band. In some cases, deliberately reducing other income-such as postponing an IRA distribution or accelerating deductible expenses into the current year-may create additional space for long-term gains to be realized tax-free.
On the flip side, couples who expect unusually high income in 2025, perhaps due to a business sale or bonus, might find that they will be in the 15% or 20% capital gains brackets regardless of the zero-rate threshold. For them, the timing question may shift from “how much can we realize at zero?” to “does realizing now avoid even higher rates or surtaxes in a later year?” The announced 2026 thresholds give some clarity, but they do not eliminate the need to model multiple years of income and potential asset sales.
Weighing Tax Savings Against Investment Goals
While the ability to shelter up to $96,700 of long-term gains in 2025-and $98,900 in 2026-is attractive, tax rules should not entirely override investment strategy. Selling simply to fill the zero-rate band can trigger transaction costs, alter asset allocation, or force investors out of positions they still want to hold. For some couples, the optimal move may be a partial realization that balances tax efficiency with long-term portfolio discipline.
Ultimately, the expanding zero-percent window offers married joint filers a valuable but nuanced planning tool. By understanding how the thresholds interact with their broader income picture and investment objectives, households can decide whether to accelerate, defer, or simply ignore capital gains realizations as the 2025 and 2026 tax years unfold.
