The IRS has finalized the income tax brackets that will apply to money earned in 2026, and the headline number is where the top rate kicks in. A single filer’s income above $640,600, and a married couple’s income above $768,700, is taxed at 37 percent — the highest of the seven marginal rates in the current system. Only a small share of returns ever reach that bracket, but the way it’s calculated is widely misunderstood, and the threshold itself moved from where it sat in 2025.
Only the income above the line is taxed at 37 percent
Crossing $640,600 as a single filer doesn’t push all of that person’s income into the 37 percent bracket — only the portion above the line is taxed at the top rate. Everything earned below it is still taxed at the lower rates that apply to each slice of income under the IRS’s rate schedule for 2026. A single filer with $700,600 in taxable income, for example, pays 37 percent only on the $60,000 above the threshold; the rest is taxed the same as it would be for a filer whose income stopped exactly at $640,600. The same logic applies further down the ladder: a dollar taxed at 22 percent doesn’t retroactively get taxed at 24 percent once total income crosses into the next bracket, only the marginal dollars above each line do.
Free retirement updates: Miss an enrollment or claim deadline and it may be gone. Our free Retirement Shield newsletter keeps readers ahead of the ones that matter. Get the free newsletter.
The six rates that sit beneath the top bracket
The 37 percent rate is the last step in a seven-rate ladder for 2026. Below it, the 35 percent rate applies to income over $256,225 for single filers ($512,450 for joint filers), 32 percent over $201,775 ($403,550 joint), 24 percent over $105,700 ($211,400 joint), 22 percent over $50,400 ($100,800 joint), and 12 percent over $12,400 ($24,800 joint). The 10 percent rate applies to the first $12,400 of taxable income for single filers, or $24,800 for married couples filing jointly. Each threshold sits well above the 2026 standard deduction of $16,100 for single filers and $32,200 for joint filers, so a household’s actual tax bill depends on taxable income after that deduction, not gross earnings.
Every bracket line is exactly double for joint filers — except the top one
Compare how the 2026 brackets line up between single and joint filers, and a pattern holds until the very top. The 35 percent threshold for joint filers, $512,450, is exactly double the single-filer threshold of $256,225. The same doubling holds for the 32, 24, 22, and 12 percent brackets. The 37 percent threshold breaks that pattern: $768,700 for joint filers is nowhere close to double the single-filer figure of $640,600, which would land above $1.28 million. That gap dates back to design choices in the 2017 tax law and has been carried forward since — it limits how large a marriage bonus two high earners can get at the very top of the income scale, and it means two single filers each earning just under $640,600 keep more combined income out of the 37 percent bracket than a married couple with the same combined earnings would.
How far the threshold moved from 2025
The top-bracket threshold rises every year to keep pace with inflation, and the 2026 jump is larger than most recent years. In 2025, the 37 percent rate started at $626,350 for single filers and $751,600 for married couples filing jointly, under the prior year’s Revenue Procedure 2024-40. The 2026 thresholds of $640,600 and $768,700 represent increases of $14,250 for single filers and $17,100 for joint filers. A household whose income didn’t grow at all between 2025 and 2026 effectively gets a small amount of extra room before touching the top rate, which is the point of indexing the brackets to inflation in the first place.
The top bracket also caps what itemized deductions are worth
Reaching the 37 percent bracket carries a second consequence beyond the marginal rate itself. The One, Big, Beautiful Bill permanently eliminated the older, broader limitation on itemized deductions that phased out at high incomes, but it replaced it with a narrower rule that specifically limits the tax benefit of itemized deductions for filers in the top bracket, detailed in Revenue Procedure 2025-32. In practice, that means a filer paying the 37 percent rate doesn’t get quite the same dollar-for-dollar value from mortgage interest, charitable gifts, or state and local taxes that a filer in a lower bracket gets from an identical deduction. The rule applies only at the top of the income scale — anyone below the 35 percent threshold isn’t affected by it.
Filers near the line can plan against a fixed number now
Because the 2026 thresholds are already finalized, filers who expect to land near $640,600 or $768,700 in taxable income don’t have to wait for tax season to plan around it. Someone weighing whether to accelerate a bonus into December, exercise stock options, or convert a traditional IRA to a Roth account can compare the exact dollar amount against the confirmed 2026 bracket line rather than guessing where it might land. The IRS’s fall announcement is the controlling record for that figure, and it won’t change between now and the 2027 filing deadline.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
More Financial Reading
