Paycheck Guide · Federal Tax · 2026
How Federal Income Tax Is Calculated on Your Paycheck
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Every US employer withholds federal income tax from employee wages using a method published by the IRS in IRS Publication 15-T, Federal Income Tax Withholding Methods. The calculator on this site encodes the same 2026 tables to produce employer-consistent estimates.
The percentage method: step by step
Employers are required to use a withholding method approved by the IRS. The most common is the percentage method, which works as follows:
- Determine the adjusted annual wage. The employer annualizes gross wages for the pay period (multiply biweekly wages by 26), then subtracts the standard withholding allowance from Publication 15-T based on the employee's W-4 filing status.
- Apply the graduated withholding table. The adjusted annual wage falls into a bracket tier from Publication 15-T. The applicable rate applies only to the income within that tier — not to all wages.
- Convert back to the pay period. The annual withholding amount is divided by 26 (for biweekly) to produce the per-paycheck withholding figure.
- Apply any additional W-4 elections. Step 3 (dependent credits) reduces withholding; Step 4c (additional withholding) increases it.
Example: $75,000 salary, single filer, biweekly
| Tax | Annual | Per biweekly paycheck |
|---|---|---|
| Gross pay | $75,000 | $2,884.62 |
| Federal income tax | −$7,670 | −$295 |
| Social Security | −$4,650 | −$179 |
| Medicare | −$1,088 | −$42 |
| Texas state tax (none) | $0 | $0 |
| Estimated net take-home | ≈ $61,593 | ≈ $2,369 |
Federal withholding shown is $7,670 per year / $295.00 per biweekly paycheck, using IRS Pub 15-T 2026 percentage-method tables.
Example: $100,000 salary, single filer, biweekly
| Tax | Annual | Per biweekly paycheck |
|---|---|---|
| Gross pay | $100,000 | $3,846.15 |
| Federal income tax | −$13,170 | −$507 |
| Social Security | −$6,200 | −$238 |
| Medicare | −$1,450 | −$56 |
| Texas state tax (none) | $0 | $0 |
| Estimated net take-home | ≈ $79,180 | ≈ $3,045 |
What the W-4 changes
The 2020-redesigned Form W-4 removed personal allowances. Key election points are: Step 2 (multiple jobs), Step 3 (dependent credits that reduce withholding), and Step 4c (extra withholding added each period). A newly hired employee who completes only Step 1 (personal info) with a single or married filing status gets the default withholding calculation from the IRS tables.
Federal withholding vs actual tax liability
Withholding is a pay-period estimate — it is not the same as the tax you owe. Over or under-withholding is reconciled when you file your annual return. If you owe at filing, adjusting your W-4 during the year can help. If you received a large refund, you may have over-withheld and can increase take-home by updating Step 4c.
See how W-4 elections affect your estimated take-home.
Estimate your take-home →Frequently Asked Questions
What is the percentage method for withholding?
The percentage method is the IRS-approved formula employers use to calculate federal income-tax withholding. It adjusts gross wages for pay period, W-4 elections, and standard deduction amounts, then applies graduated rates from IRS Publication 15-T.
Why is less federal tax withheld on biweekly paychecks than monthly?
Federal withholding tables are pay-period specific. A biweekly paycheck represents 1/26 of the annual wage. The withholding amount is calculated on the per-period wage, not the annualized salary directly — though the total withheld over 26 periods should approximate the annual liability.
How much federal income tax is withheld on a $75,000 salary?
For a single filer earning $75,000 per year, federal income-tax withholding is approximately $7,670 per year, or $295.00 per biweekly paycheck, using the IRS 2026 percentage-method tables with a standard W-4.
Does filing status affect how federal income tax is calculated?
Yes. Your W-4 filing status selection (Single, Married Filing Jointly, or Head of Household) determines which IRS Publication 15-T table applies. Married filing jointly withholding is generally lower than single at the same gross wage.
Is federal income-tax withholding the same as what I owe on my return?
Not necessarily. Withholding is an estimate calculated each pay period from your W-4 elections. Your actual tax liability for the year is determined when you file your return, and may result in a refund or balance due.
Figures and methods are based on official-source data encoded in the calculator. Not tax advice. Review the methodology and consult a qualified professional for your situation.