About USFirst

USFirst exists to answer one kind of question well: "what do the numbers actually work out to?" — for your paycheck, your taxes, your mortgage, and your savings.

We maintain 99+ free calculators focused on United States personal finance. Every tax-related tool is rebuilt annually from primary sources: IRS revenue procedures for federal brackets and deductions, the Social Security Administration for FICA limits, and each state's department of revenue for state income tax rules. When a rate changes, our data files change — that discipline is the core of the product.

What we are not

We are not tax advisors, financial planners, or lenders, and our results are estimates for education and planning — not advice. Calculators simplify: credits, phase-outs, and local taxes may not be modeled. For decisions that matter, verify with the IRS, your state tax authority, or a licensed professional. See our full disclaimer.

Contact

Found an error or have a calculator request? We genuinely want to hear it — contact us.