Free Tax Calculators for Business Owners
Run your own numbers before you talk to anyone. Every tool uses current IRS figures for 2025 and 2026, works on your phone, and requires no signup.
S-Corp Tax Savings Calculator
The big one. Compare sole proprietor vs. S-corporation taxes side by side — payroll taxes, QBI deduction, and admin costs included — and see whether an election pays off at your profit level.
Calculate S-corp savings →Quarterly Estimated Tax Calculator
Project this year's federal tax, apply the IRS safe-harbor rules automatically, and get a per-quarter payment with every 1040-ES due date on the calendar.
Calculate quarterly payments →Self-Employment Tax Calculator
See how the 15.3% SE tax hits your 1099 or business income — including the Social Security wage cap, the extra Medicare tax, and the half you get to deduct back.
Calculate SE tax →Home Office & Mileage Calculator
Compare the simplified and actual home-office methods, add your business miles, and translate the deductions into estimated tax dollars saved.
Calculate deductions →Like What the Numbers Say?
Bring your calculator results to a virtual consultation and we'll pressure-test them against your full situation — usually finding a few things the tools can't see.