How PaycheckCalc estimates take-home pay

Our review workflow

1. Update federal brackets, standard deductions, and FICA assumptions from primary IRS and SSA guidance.
2. Check enacted state income-tax rates, flat-tax transitions, and reciprocity rules against official state publications.
3. Review supported city and county payroll taxes using municipal code references and state collections guidance.
4. Run scenario tests across filing statuses, deduction types, and high-income edge cases before publishing.

What the calculator includes

• Federal income-tax brackets, standard deduction logic, and filing status handling
• Social Security and Medicare withholding, including the Additional Medicare Tax
• State income-tax treatment in all 50 states plus Washington, DC
• Supported city and local taxes where payroll withholding can materially change net pay
• Pre-tax 401(k), HSA, post-tax deductions, and optional itemized-deduction modeling

Known limitations

• Custom W-4 elections and employer-specific withholding methods
• Supplemental wage treatment for bonuses, commissions, and one-time payouts
• Multi-state employment, nonresident credits, and complex reciprocity scenarios
• Stock compensation, self-employment tax, AMT, and other specialized tax treatments

Why source transparency matters

Payroll calculators sit close to real financial decisions. If a user is comparing job offers, relocating, or deciding how much to defer into a retirement plan, the estimate needs a clear source trail. That is why we cite the agencies and code references that drive the model.