US Federal Tax & Payroll Calculator
Accurate federal and state tax calculations with W-4 smart wizard, FICA processing, and 50-state support for US employees.
W-4 Smart Wizard
Interactive W-4 form guidance for accurate withholding
FICA Tax Processing
Social Security and Medicare tax calculations with current thresholds
50-State Support
Comprehensive state income tax support for all US states
401(k) Planning
Traditional and Roth 401(k) contribution planning
How It Works
Complete W-4 Information
Enter your filing status, dependents, and withholding preferences
Automatic Tax Calculation
Our engine processes federal, state, and FICA taxes using 2025 rates
Detailed Results
Get comprehensive breakdown of all deductions and net pay
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Advanced Features
🏛️ Federal Tax Features
- ✓2025 progressive tax brackets (10% to 37%)
- ✓Standard deduction optimization by filing status
- ✓Child Tax Credit and dependent calculations
- ✓Multiple jobs and spouse working adjustments
🏛️ FICA & State Features
- ✓Social Security tax (6.2%) up to wage base limit
- ✓Medicare tax (1.45%) with additional 0.9% for high earners
- ✓All 50 states including no-tax states
- ✓Traditional and Roth 401(k) contribution tracking
Frequently Asked Questions
Does the calculator include state income tax?
Yes. Select your work state and we automatically apply the latest state income tax brackets, including states with no income tax.
How accurate is the W-4 smart wizard?
The wizard follows the 2025 IRS W-4 instructions, including dependents, multiple jobs, and additional withholding options so your estimates stay aligned with the official form.
Can I model 401(k) contributions?
Enter traditional or Roth 401(k) amounts to see how contributions reduce taxable income and impact net pay.
Is my data stored anywhere?
No. All calculations run locally in your browser, so your salary information never leaves your device.
Important Disclaimer
These calculations provide estimates based on current tax rates and regulations. Results should be used for guidance only. For official payroll processing, consult with qualified tax professionals or payroll specialists. Tax regulations may change, and individual circumstances may affect actual calculations.