How Gross Pay Is Calculated
Your gross pay is the starting point before any deductions or taxes.
- Salary: Annual salary divided by pay periods per year (weekly=52, bi-weekly=26, semi-monthly=24, monthly=12). Any per-period bonus is added.
- Hourly: Hourly rate × regular hours + hourly rate × 1.5 × overtime hours, plus any per-period bonus.
Federal Income Tax Withholding
Federal income tax uses the 2024 tax brackets (10%, 12%, 22%, 24%, 32%, 35%, 37%). The calculator annualizes your per-period income, applies the 2024 standard deduction, runs it through the progressive brackets, then divides back to a per-period amount.
- Standard deduction: Single $14,600 / Married Filing Jointly $29,200 / Head of Household $21,900
- Traditional 401(k) and other pre-tax deductions reduce taxable income before the brackets apply.
- Any extra withholding you specify is added to the bracket result.
FICA Taxes
FICA covers Social Security and Medicare. These are the employee shares only — your employer pays an equal amount separately.
- Social Security: 6.2% on wages up to $168,600 (2024 wage base). This calculator uses an annualized average, so the per-period amount may differ from payroll software that tracks year-to-date wages precisely.
- Medicare: 1.45% on all wages with no cap.
- Additional Medicare Tax: 0.9% on annual wages above $200,000 (single/HOH) or $250,000 (married filing jointly).
State Income Tax
State taxes use simplified flat effective rates by state. Nine states have no income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.
These are effective rate approximations — actual state tax uses progressive brackets, personal exemptions, and state-specific deductions that vary considerably. Local and city taxes (such as New York City or Philadelphia) are not included.
Reading the Results
The result card shows per-paycheck, monthly, and annual figures. The breakdown table lists each line item so you can see where each dollar goes.
- Effective tax rate = total taxes ÷ annual gross pay. This is different from your marginal (top bracket) rate.
- The additional Medicare line is hidden when it does not apply.
- Assumptions and limitations: 2024 federal brackets, simplified flat state rates, standard deduction only (no itemized), no credits, FICA wage base $168,600, local taxes not included.