Line 16 on Form 1040 is your federal income tax figured on the taxable income shown on Line 15. You arrive at the number one of two ways: by looking it up in the IRS Tax Table if your taxable income is under $100,000, or by running it through the Tax Computation Worksheet if it’s $100,000 or more.1Internal Revenue Service. Instructions for Form 1040 – Section: Line 16 If you had qualified dividends or long-term capital gains, you use the Qualified Dividends and Capital Gain Tax Worksheet instead, which blends the preferential rates with the ordinary rates and hands you a single number for the line.
What Line 16 Represents
Line 16 is labeled simply “Tax.” It captures your base income tax liability before nonrefundable credits reduce it and before additional taxes get layered on. It is not your total tax. That figure lives on Line 24, after the form adds items from Schedule 2, subtracts credits, and adds other taxes like self-employment tax and the net investment income tax. Treat Line 16 as a stepping stone: the accurate application of the tax rates to your taxable income, and nothing more.
The Taxable Income That Feeds Line 16
Because Line 16 is computed from Line 15, an error upstream produces an error here. The path to Line 15 has three parts.
Your adjusted gross income appears on Line 11. AGI is your total income from all sources — wages, investment returns, business profits, retirement distributions — minus “above-the-line” adjustments like educator expenses, IRA contributions, and certain business deductions.2Internal Revenue Service. Instructions for Form 1040 – Section: Line 11
From AGI you subtract either the standard deduction or your itemized deductions, whichever is larger. For tax year 2026 the standard deduction is $16,100 for single filers and married filing separately, $32,200 for married filing jointly, and $24,150 for head of household.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Itemizing only helps if your deductible expenses (state and local taxes, now capped at $40,000 or $20,000 if married filing separately with a phase-down at higher incomes; mortgage interest; charitable contributions) exceed the standard amount.4Internal Revenue Service. Topic No. 503, Deductible Taxes
If you have income from a sole proprietorship, partnership, or S corporation, you may also claim the qualified business income deduction on Line 13. Eligible filers can deduct up to 20% of qualified business income; for 2026, the deduction begins to phase out above $201,750 of taxable income for single filers and $403,500 for joint filers.
Filing status runs through all of it. It sets the standard deduction, the bracket thresholds, and eligibility for various credits.5Internal Revenue Service. Filing Status Pick the wrong status or miscalculate your deductions, and Line 16 will be wrong before you even open the tax table.
How to Calculate the Number on Line 16
Federal income tax uses seven progressive brackets. Each slice of income is taxed at its own rate; only the income that falls inside a given bracket is taxed at that bracket’s rate. Moving into a higher bracket never means your entire income is taxed at the new rate. The 2026 brackets for single filers and married couples filing jointly are:3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
- 10%: up to $12,400 (single) / $24,800 (joint)
- 12%: over $12,400 / $24,800
- 22%: over $50,400 / $100,800
- 24%: over $105,700 / $211,400
- 32%: over $201,775 / $403,550
- 35%: over $256,225 / $512,450
- 37%: over $640,600 / $768,700
Tax Table or Tax Computation Worksheet
If your taxable income on Line 15 is under $100,000, look up your tax in the IRS Tax Table. The table gives you a pre-calculated figure based on $50 income ranges.6Internal Revenue Service. Publication 1040, Tax and Earned Income Credit Tables Find your row for your income range, read across to your filing status column, and that number goes on Line 16.
If your taxable income is $100,000 or more, use the Tax Computation Worksheet instead. The worksheet walks you through applying the marginal rates to your specific taxable income.1Internal Revenue Service. Instructions for Form 1040 – Section: Line 16 The underlying math is the same as the table; the worksheet just handles higher figures with more precision than a lookup can.
When You Have Qualified Dividends or Long-Term Capital Gains
Qualified dividends and long-term capital gains (from assets held longer than a year) are taxed at preferential rates of 0%, 15%, or 20% based on your total taxable income.7Internal Revenue Service. Topic No. 409, Capital Gains and Losses For single filers in 2026, the 0% rate applies up to $49,450 of taxable income, the 15% rate covers income up to $545,500, and the 20% rate takes effect above that. For joint filers, the thresholds are $98,900 and $613,700.8Internal Revenue Service. 2026 Adjusted Items, Rev. Proc. 2025-32
When your return contains both ordinary income and preferential-rate income, don’t use the tax table on your total. Use the Qualified Dividends and Capital Gain Tax Worksheet, or Schedule D if you have capital loss carryforwards or other complications. The worksheet applies the ordinary rates to your ordinary income and the preferential rates to the qualifying portion, then combines them into the single figure that goes on Line 16. Skipping the worksheet is a common way to overpay.
Uncommon Items Added Directly to Line 16
A few less common taxes get added directly to Line 16 rather than routed through Schedule 2. These include the tax on a child’s investment income if you elect to report it on your return (Form 8814), the tax on lump-sum distributions from qualified retirement plans (Form 4972), and recapture of an education credit if you received tax-free educational assistance after claiming the credit in an earlier year.1Internal Revenue Service. Instructions for Form 1040 – Section: Line 16 Most filers will never touch these boxes. For nearly everyone, Line 16 is just the tax from the table or the worksheet.
Where Line 16 Fits in the Rest of the 1040
Line 16 begins a chain of additions and subtractions that ends at your total tax on Line 24.
Line 17 adds any amounts from Schedule 2, Part I. The most significant of these is the Alternative Minimum Tax, a parallel calculation aimed at higher-income filers who use deductions and preferences to pull their regular tax down too far. For 2026 the AMT exemption is $90,100 for single filers and $140,200 for joint filers, with phaseouts starting at $500,000 and $1,000,000.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The sum of Line 16 and Line 17 appears on Line 18.
Nonrefundable credits then reduce that combined number. The child tax credit and credit for other dependents go on Line 19. Other nonrefundable credits from Schedule 3, such as the foreign tax credit and education credits, go on Line 20. These can zero out the tax but not push it below zero. The result after credits appears on Line 22.
Line 23 then adds the other taxes from Schedule 2, Part II: self-employment tax, the 3.8% net investment income tax, the 0.9% Additional Medicare Tax, the 10% early distribution penalty on retirement withdrawals before age 59½, and household employment taxes, among others. Line 22 plus Line 23 gives you Line 24, your total federal tax liability for the year. Everything after Line 24 is about how much you’ve already paid and whether you’re getting a refund or owe a balance.
Understanding this chain matters when you’re checking your return. If the tax you owe seems too high or too low, the fastest diagnostic is to isolate Line 16 first: rerun the tax table or worksheet against your Line 15 amount, confirm the right method for your income level, and check the qualified dividends worksheet if it applies. If Line 16 is right, the problem is downstream.