What Are Tax Tables? Lookup Steps, $100K Rule, and 2026 Brackets

Tax tables are the charts the IRS publishes each year that tell you exactly how much federal income tax you owe based on your taxable income and filing status. If your taxable income is under $100,000, you’re required to use them instead of doing the bracket math yourself.¹ Every row covers a $50 income range and shows a pre-calculated tax for each filing status, so the graduated rates are already built into the number you look up.

How the Table Is Laid Out

The table is a grid. Down the left side, rows list taxable income in $50 increments, each defined by an “at least” floor and a “but less than” ceiling. If your taxable income is $42,350, you use the row that starts at $42,350 and runs up to (but doesn’t include) $42,400.²

Across the top are four filing-status columns: single, married filing jointly, married filing separately, and head of household. Qualifying surviving spouses use the married filing jointly column.² Where your income row crosses your filing-status column, you’ll find one dollar figure. That is your federal income tax.

How to Look Up Your Tax

The number you need is Line 15 of Form 1040 or 1040-SR. Line 15 is your taxable income, not your gross earnings. It’s what remains after you subtract the standard deduction (or itemized deductions) and certain other adjustments. For 2026, the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.³ If you look up your salary instead of Line 15, you’ll overshoot your tax badly.

With the Line 15 figure in hand, find the row where your income falls between the “at least” and “but less than” amounts. If your income lands exactly on a number listed in the “at least” column, you use that row. Then read across to the column that matches your filing status. The IRS gives this example: a married couple filing jointly with $25,300 in taxable income uses the $25,300 to $25,350 row, looks under married filing jointly, and finds $2,562. That figure goes on Line 16 of the return.²

A note on rounding. You can round cents to whole dollars anywhere on your return, but if you round one line, round them all. Drop anything under 50 cents and round 50 to 99 cents up to the next dollar.¹ Since the table works in $50 bands, a few cents won’t change which row you land in.

If you file electronically or use tax software, the program picks the right table or worksheet on its own. Knowing how the lookup works still matters if you file on paper, and it lets you sanity-check what the software produced.

When the Standard Table Doesn’t Apply

Some kinds of income pull you out of the regular table even when your taxable income is under $100,000. The main ones:

Qualified dividends or net capital gains. If you report qualified dividends on Line 3a, or have a net capital gain on Schedule D, you generally use the Qualified Dividends and Capital Gain Tax Worksheet (or the Schedule D Tax Worksheet). These apply lower rates to long-term investment income that the standard table doesn’t account for. Even a small taxable brokerage account can trigger this.¹
Kiddie tax. A child under 18 with more than $2,700 in unearned income (interest, dividends, capital gains) uses Form 8615, which taxes that income at the parent’s rate when it’s higher. The rule also reaches full-time students ages 19 through 23 who don’t earn more than half their own support.⁴⁵
Foreign earned income exclusion. Claiming the exclusion or housing deduction on Form 2555 sends you to the Foreign Earned Income Tax Worksheet, which figures your rate as if the excluded income were still counted.⁶
Farm or fishing income averaging. If you spread farming or fishing income over prior years, you use Schedule J instead.
Lump-sum retirement distributions. Certain qualifying lump-sum distributions from retirement plans can use a 10-year averaging method on Form 4972, separate from the regular table.⁷

Qualified dividends catch the most filers off guard. If you own index funds or dividend-paying stocks in a taxable account, you almost certainly have some, and the table isn’t the right tool.

What Happens at $100,000 and Above

Once your taxable income reaches $100,000, the last row of the table sends you to the Tax Computation Worksheet in the Form 1040 instructions.² The worksheet has four sections, one per filing status, and uses a simple formula: multiply your taxable income by the rate for your bracket, then subtract a fixed amount that corrects for the lower rates paid on the income below that bracket.

A worked example. A single filer with $150,000 of taxable income in 2026 falls in the 24% bracket. The formal bracket schedule says this person owes $17,966 plus 24% of the amount over $105,700.⁸ So 24% of $44,300 comes to $10,632, plus the $17,966 base, for $28,598 total. The worksheet shortcut arrives at the same number by multiplying the full $150,000 by 24% and subtracting a fixed correction.

2026 Federal Brackets Behind the Table

The IRS adjusts bracket thresholds for inflation every year. For 2026, the seven rates and their starting points for single filers and married couples filing jointly are:³

10%: up to $12,400 (single) or $24,800 (joint)
12%: over $12,400 to $50,400 (single) or over $24,800 to $100,800 (joint)
22%: over $50,400 to $105,700 (single) or over $100,800 to $211,400 (joint)
24%: over $105,700 to $201,775 (single) or over $211,400 to $403,550 (joint)
32%: over $201,775 to $256,225 (single) or over $403,550 to $512,450 (joint)
35%: over $256,225 to $640,600 (single) or over $512,450 to $768,700 (joint)
37%: over $640,600 (single) or over $768,700 (joint)

These brackets apply to taxable income, not gross wages. A single person earning $70,000 who takes the $16,100 standard deduction has $53,900 in taxable income. Only the portion above $50,400 hits 22%; everything below is taxed at 10% and then 12%. Both the tax table and the Tax Computation Worksheet build this graduated structure into their output, so you never pay a single flat rate on your whole income.

The Cost of Using the Wrong Method

Picking the wrong table or worksheet is not just a paperwork mistake. If you underpay by enough, the IRS can add an accuracy-related penalty of 20% of the underpayment. A “substantial understatement” triggers the penalty when the shortfall is more than 10% of the tax you should have reported, or $5,000, whichever is greater.⁹ Two checks handle most of the risk: confirm you’re looking up Line 15 rather than a different line, and confirm that none of the income types above should have sent you to a different worksheet.

1
Internal Revenue Service. Instructions for Form 1040 (2025)
2
Internal Revenue Service. Publication 1040 (2025), Tax and Earned Income Credit Tables
3
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
4
Internal Revenue Service. Topic No. 553, Tax on a Childs Investment and Other Unearned Income
5
Internal Revenue Service. Instructions for Form 8615 (2025)
6
Internal Revenue Service. Instructions for Form 2555 (2025)
7
Internal Revenue Service. About Form 4972, Tax on Lump-Sum Distributions
8
Internal Revenue Service. Revenue Procedure 2025-32
9
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments