Married couples filing jointly who keep their taxable income below $98,900 in 2026 will owe zero federal tax on long-term capital gains. The IRS confirmed that threshold in its announcement of annual inflation adjustments for tax year 2026, incorporating changes enacted through Public Law 119-21, the One, Big, Beautiful Bill Act. For households selling a home, cashing out index-fund shares, or harvesting gains from a small portfolio, the practical result is straightforward: realized long-term gains that stay within that income ceiling face a 0% preferential rate at the federal level.
How the 0% bracket reached $98,900 for joint filers
The IRS issues inflation-adjusted tax parameters every year, and the 2026 edition arrived through an official news release, which references Rev. Proc. 2025-32 for full details. What made this cycle different is that the adjustments reflect amendments to the Internal Revenue Code written into Public Law 119-21, the legislation Congress passed as the One, Big, Beautiful Bill Act. Those amendments altered the baseline figures and indexing mechanics that feed into the annual recalculation of brackets, deductions, and capital-gains thresholds.
The 0% long-term capital gains rate applies to joint filers whose taxable income, after deductions, falls below the top of the lowest capital-gains bracket. Because Public Law 119-21 made permanent certain provisions that were otherwise set to expire, the starting point for inflation indexing shifted upward. Continued consumer-price adjustments then pushed the 2026 number to $98,900. The effect is that a couple can realize substantial long-term gains from stocks, real estate, or other qualifying assets and pay no federal capital-gains tax, provided their total taxable income stays under that line.
It is important to distinguish taxable income from total economic resources. The $98,900 threshold is calculated after subtracting either the standard deduction or itemized deductions from adjusted gross income, and it includes wages, interest, dividends, and other taxable amounts alongside long-term gains. A couple with modest wages and a large one-time gain might still fall under the limit, while a high-earning household with the same gain could be pushed into the 15% or 20% capital-gains brackets.
The Net Investment Income Tax still applies above $250,000
A zero capital-gains rate does not automatically mean zero federal tax on investment income. A separate levy, the 3.8% surtax on net investment income, applies to certain investment income for married couples whose modified adjusted gross income exceeds $250,000. That $250,000 threshold is set by Section 1411 of the Internal Revenue Code and is not indexed for inflation, so it has remained unchanged since the tax took effect.
For most couples whose taxable income is under $98,900, the $250,000 modified AGI trigger for the 3.8% surtax will not come into play. Taxable income and modified AGI are calculated differently, but a household well below $98,900 in taxable income is unlikely to clear $250,000 in modified AGI without unusual circumstances such as large tax-exempt interest or substantial adjustments. The gap between the two thresholds gives lower- and middle-income joint filers a clean path to 0% federal tax on their long-term gains.
Households closer to the $250,000 modified AGI line need to consider both systems simultaneously. A couple might still fall within the 0% capital-gains bracket yet owe the 3.8% surtax on some or all of their investment income if their modified AGI exceeds the statutory threshold. In that situation, the combined federal rate on long-term gains effectively becomes 3.8%, not zero, even though the regular capital-gains rate is 0%.
Planning around the 2026 thresholds
The widened 0% bracket creates opportunities for timing and income-management strategies. Retirees with flexible income streams can delay or accelerate withdrawals from tax-deferred accounts to keep taxable income under $98,900 in years when they plan to sell appreciated assets. Workers with variable bonuses might spread sales of stock or a rental property across multiple tax years to avoid pushing taxable income above the line.
Taxpayers who expect to fall near the threshold should also pay attention to deductions. Itemizing mortgage interest, state and local taxes (subject to federal limits), and charitable contributions can lower taxable income enough to preserve 0% treatment for a planned sale. Conversely, claiming additional income, such as Roth conversions, in a year with no capital gains might be more efficient than stacking those items in a year when the 0% bracket is already fully used.
Because the interaction of taxable income, modified AGI, and specialized levies like the Net Investment Income Tax can be complex, many households will benefit from running projections before executing large transactions. The IRS offers an online account portal that can help taxpayers monitor their information, but detailed modeling is often best done with professional software or the assistance of a qualified tax adviser.
Ultimately, the $98,900 ceiling for married couples in 2026 underscores how much federal tax outcomes depend on the precise mix and timing of income. For joint filers able to keep taxable income under that mark and below the $250,000 modified AGI trigger, long-term capital gains can be realized at a 0% federal rate, turning careful planning into tangible savings.
Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
