Free calculators and a federal tax calendar for US small business owners, using 2026 figures. They give you a solid estimate — for advice on your situation, a CPA is the next step.
- Self-employment tax calculator 2026 — Estimate your 2026 self-employment tax — Social Security and Medicare on your net profit — and the half you can deduct.
- LLC vs S corp tax savings calculator — Would an S corp election save you money? Compare self-employment tax with payroll taxes on a reasonable salary, after running costs.
- Sales tax calculator — Add sales tax to a price or work out the tax included in a total, using the combined rate for your state, county and city.
- Federal tax calendar 2026–2027 for small businesses — Key federal deadlines for small businesses: estimated taxes, W-2 and 1099-NEC, S corp and partnership returns, 1040 and 1120.