For the 2025 tax year, Form 1040 line 16 is your income tax calculated from the taxable income on line 15 using the IRS method that applies to you, plus certain additional taxes required by the instructions. Most taxpayers use the Tax Table below $100,000 of taxable income or the Tax Computation Worksheet at $100,000 or more, but special tax situations can require another worksheet or form.
What Form 1040 line 16 represents
Line 16 reports tax calculated on your taxable income—not your tax refund, balance due, or the amount of tax withheld from your paychecks. First complete Form 1040 through line 15. That line supplies the taxable-income figure used in the applicable tax table or worksheet.
The calculation depends on your filing status and whether special tax rules apply. It is not always a matter of multiplying all your taxable income by one bracket rate: the IRS table or worksheet determines the ordinary tax amount, and the line 16 instructions require certain other taxes to be included when they apply.
Choose the calculation method for your situation
| Situation | Method for 2025 Form 1040 |
|---|---|
| Taxable income on line 15 is less than $100,000, and no special method applies | Use the Tax Table row covering your taxable income and the column for your filing status. |
| Taxable income on line 15 is $100,000 or more, and no special method applies | Use the Tax Computation Worksheet section for your filing status and taxable-income range. |
| A special tax situation applies | Follow the applicable worksheet or form identified in the line 16 instructions; this can replace the ordinary table or computation worksheet. |
The $100,000 threshold is the method cutoff in the IRS instructions for tax year 2025, not a tax bracket. Check the instructions for exceptions before following the ordinary path. IRS 2025 Instructions for Form 1040.
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Use the Tax Table when taxable income is below $100,000
Find the row that contains the taxable income shown on line 15, then read the amount under your filing-status column. The table uses income ranges, so the result may differ from a calculation that applies a marginal rate directly to the exact line 15 amount.
For example, the IRS instructions give a married couple filing jointly with $25,300 of taxable income. They use the $25,300–$25,350 Tax Table row and enter $2,562 on line 16. This example is for the 2025 tax year. IRS 2025 Instructions for Form 1040.
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Use the Tax Computation Worksheet at $100,000 or more
When line 15 is $100,000 or higher and no special worksheet applies, locate the worksheet section for your filing status and taxable-income range. It applies the multiplication amount and subtracts the specified amount; the entries vary by status and range.
For example, for a single filer with taxable income from $100,000 through $103,350, the 2025 worksheet uses 22% and subtracts $5,086. Do not apply that example’s figures to another filing status, income range, or tax year. IRS 2025 Instructions for Form 1040.
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Check for a special worksheet or form first
Some taxpayers must use a method other than the ordinary Tax Table or Tax Computation Worksheet. The 2025 instructions identify these possible paths:
- Form 8615: may apply to a child’s unearned income.
- Qualified Dividends and Capital Gain Tax Worksheet: may apply when qualified dividends or capital gains receive special tax treatment.
- Schedule D Tax Worksheet: applies in specified capital-gain situations. The instructions include cases involving a required Schedule D, positive amounts on Schedule D lines 18 or 19, and gains on lines 15 and 16; they also identify a case involving Form 4952 and an amount on line 4g. See the 2025 Schedule D instructions.
- Schedule J: may apply when using income averaging for farming or fishing income.
- Foreign Earned Income Tax Worksheet: may apply when foreign earned income or housing exclusions affect the calculation.
Use the 2025 Form 1040 instructions to determine whether one of these paths fits your return and to follow its calculation directions. Do not default to the ordinary table solely because line 15 is below $100,000.
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Add other taxes the line 16 instructions require
After determining the income tax under the applicable method, check whether the line 16 instructions require any other amounts to be included. They list tax from Form 8814, tax from Form 4972, certain tax associated with a section 962 election, and education credit recapture. The instruction begins: “Include in the total on the entry space on line 16 all of the following taxes that apply.” The list is conditional: include only the items that apply to your return. IRS 2025 Instructions for Form 1040.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Information needed to calculate your line 16
A personal calculation requires more than an income figure. Gather:
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- Your taxable income from Form 1040 line 15.
- Your filing status.
- Details needed to determine whether a special worksheet or form applies, including relevant capital gains, qualified dividends, foreign earned income, farming or fishing income, or a child’s unearned income.
- Any applicable additional taxes named in the line 16 instructions.
This explanation covers the 2025 tax-year Form 1040 and 1040-SR. Tax tables, thresholds, and directions may change in other years, so use the instructions for the tax year on your return.
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