About Owner's Math

Owner's Math is run by a small-business owner who has filed a Schedule C and paid quarterly estimated taxes since 2020. These are the calculators I wanted when I started out: quick, free, no sign-up, and honest about how the number was figured.

How the numbers are checked

Every calculator uses figures published by the IRS and the Social Security Administration for the current tax year, and each page lists its sources and formula. Calculators are re-checked when the IRS releases new inflation adjustments each fall.

Not tax advice

These tools give planning estimates. Your situation may include credits, deductions or state rules the calculators don't cover. Check important decisions with a tax professional.