Calculators
Each one applies a published rule to the numbers you type, shows the rule and its source, and says what it leaves out. They run in your browser; nothing you enter is sent anywhere.
- State estimated tax calculator (2026), The safe-harbor amount and installment dates for 42 states, from each state's own instructions, with federal alongside.
- S corp vs LLC tax savings, Self-employment tax against payroll taxes on a reasonable salary, with the QBI effect and the added costs, on 2026 figures.
- Reasonable salary for an S corp, The IRS factors turned into a work-based method, with a documentation line for the file.
General information, not tax advice. Confirm results with your accountant.