How to Use the Salary Withholding Tax Calculator
Every paycheck shows federal income tax withheld, but few people know exactly how the IRS arrives at that number. Employers use IRS Publication 15-T withholding tables based on your W-4, but the underlying math follows the same standard deduction and marginal tax bracket structure used to file your annual return. This calculator applies the 2024 standard deduction for a single filer, runs your annualized taxable income through the federal tax brackets, subtracts a simplified Child Tax Credit for each dependent, and divides the result by 12 to estimate your monthly withholding.
For example, a $6,000 monthly salary with no dependents gives an annual salary of $72,000. After the $14,600 standard deduction, taxable income is $57,400, which falls across the 10%, 12%, and 22% brackets for an estimated annual federal tax of roughly $7,681 — about $640 withheld per month.
This is a simplified planning estimate, not your actual paycheck. It assumes a single filer with standard W-4 settings and doesn't include FICA taxes, state income tax, pre-tax deductions like a 401(k), or W-4 adjustments such as additional withholding or exemptions. For your exact withholding, check your pay stub or the IRS Tax Withholding Estimator.
Frequently Asked Questions
Not exactly. This tool estimates federal withholding using the 2024 standard deduction, tax brackets, and a simplified Child Tax Credit, based on the IRS Publication 15-T approach for a single filer. Your actual W-4 elections, filing status, and state taxes can change the real number.
No. This calculator only estimates federal income tax withholding. FICA taxes (6.2% Social Security plus 1.45% Medicare) and any state income tax are withheld separately, so your actual take-home pay will be lower than the figure shown here.