Calculation Methodology
TakeHomePay is a planning calculator for Tax Year 2025. It annualizes the pay amount, applies the selected filing status and deductions, estimates federal and state withholding, then converts the annual result back to the selected pay frequency.
What is included
Federal income tax uses the 2025 brackets and standard deductions in the calculator data. FICA includes Social Security and Medicare, including the additional Medicare threshold where applicable. State pages use the state-specific 2025 rate structure shown in each state summary.
Pre-tax 401(k), HSA, and FSA inputs reduce taxable wages according to the assumptions shown in the calculator. Local levies and employer-specific payroll rules are not fully represented.
Primary references
- IRS.gov for federal brackets, deductions, and withholding guidance.
- Social Security wage base tables for payroll-tax limits.
- State revenue or taxation agency publications for the state-specific schedules represented in the app.
Important limitations
An employer's payroll system may use different W-4 settings, benefit treatment, supplemental wage rules, local taxes, or rounding. This tool estimates withholding and is not a final tax-liability calculation or tax advice. Recheck the official sources when the tax year or your circumstances change.