Mark Cuban had a one-word verdict on a tax comparison that was going around Bluesky this month: "Misleading. The investor can have no other income of any kind to pay 0 taxes. They can't make more than 50k in TOTAL," he wrote on Sept. 8, quote-posting the account of Americans for Tax Fairness.
The post he was answering had performed well. "A truck driver working 40-hour weeks to make $50,000 a year pays about $3,800 in federal income tax. An 8% rate," it read. "An investor earning the same $50,000 in long-term capital gains pays $0." Americans for Tax Fairness, a campaign run as a project of the New Venture Fund, published it earlier that day. As of Sept. 18, it carried roughly 6,900 likes and 2,400 reposts.
So which number is wrong? Start with the truck driver. For the 2026 tax year, the standard deduction for a single filer is $16,100, which leaves $33,900 of taxable income on $50,000 of wages. The first $12,400 of that is taxed at 10%, and the rest at 12%. The bill comes to $3,820. The viral post said about $3,800, and it is right.
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The investor side is where Cuban's correction lands, and it lands about $15,550 short. In 2026, a single filer pays nothing on long-term capital gains up to $49,450 of taxable income. The standard deduction sits on top of that ceiling rather than inside it, so a filer whose only income is long-term gains can realize roughly $65,550 gross and still owe $0 in federal income tax. That figure is Barchart's own arithmetic on the published 2026 tables, and it assumes a single filer under 65 who takes the standard deduction, has no other income, and pays no state tax.
Cuban's mechanism is correct. Other income crowds out the 0% bracket because the bracket is measured on taxable income from all sources, not gains alone. Earned wages and the gains get pushed up into the 15% band. What he understated was the ceiling itself, and the reason is the standard deduction, which the 0% threshold does not include.
His "no other income of any kind" is also stricter than the code requires. A single filer could take in up to $16,100 of ordinary income, watch the standard deduction absorb all of it, realize $49,450 in long-term gains on top, and still show a $0 federal income tax liability. They would owe payroll tax on the wage portion, which is a separate line.
Cuban gave his reason for defending the bracket in the same post. "The mission is to protect retirees who have little income and sell stocks or other investments," he wrote. On that narrow point, the 0% band does what he says it does. A retiree living on modest Social Security income who sells a position to cover a roof or a medical bill fits the profile the bracket was built around, and the arithmetic above describes that person too.
None of this is new territory for him. Cuban has argued before that the wage earner gets the worse end of the same fault line, and the question of who should pay what is a running argument among the very wealthy. Jeff Bezos has said the bottom half of earners should pay no federal income tax at all.
One figure neither side put on the table widens the gap rather than closing it. The truck driver also pays Social Security and Medicare tax at a combined 7.65% on the full $50,000, which is another $3,825. The investor realizing long-term gains pays no payroll tax on them. Counting both lines, the wage earner pays roughly $7,645 in federal tax, and the investor pays nothing.
On the date of publication, Caleb Naysmith did not have (either directly or indirectly) positions in any of the securities mentioned in this article. All information and data in this article is solely for informational purposes. For more information please view the Barchart Disclosure Policy here.