10 free tax & finance (usa) — paycheck, federal tax, 401(k), and ira

Estimate your 2024 US federal income tax by filing status and adjustments, with effective and marginal rates.

Compute SE tax — Social Security, Medicare, and the 0.9% additional Medicare surcharge — for freelancers and 1099 workers.

Estimate your monthly Social Security benefit using the SSA bend-point PIA formula and your claiming age.

Convert an hourly rate into weekly, monthly, and annual pay based on hours and weeks worked.

Calculate FLSA overtime pay at 1.5× (or custom multiplier) for any hourly rate and hours worked.

Estimate your net paycheck after federal, FICA, state tax, and 401(k) contributions for any pay frequency.

Project your 401(k) balance at retirement with contributions, employer match, and compounding returns.

Project tax-free Roth IRA growth from annual contributions and expected returns.

Estimate federal capital gains tax on short-term or long-term sales using 2024 LTCG brackets.

Estimate your federal refund or balance owed from income, withholding, and credits.