About Dollar Math

Dollar Math builds free, fast calculators for everyday money questions: how much you'll take home from a paycheck, what a house will really cost each month, how much interest a loan charges and how much tax you owe.

Where our numbers come from. Federal tax brackets, standard deductions and credits come from the IRS (Revenue Procedure 2025-32 for tax year 2026). Social Security and Medicare rates come from the Social Security Administration. State brackets and deductions come from each state's 2026 tax rules as compiled by the Tax Foundation. We review the numbers whenever rates change, at least once a year.

Your privacy. All calculations run in your own browser. We never receive the salary, loan or tax figures you enter.

Limits. Our calculators give estimates for common situations. They are not tax, legal or financial advice. For decisions that matter, check with a qualified professional or your state's tax agency.

Spotted a mistake or want a new calculator? Tell us on our contact page.