Reference

The figures the calculators run on, each with its source and the date it was checked. Generated from the rules file, not typed in.

• Self-Employment Tax Rate 2026

  The self-employment tax rate for 2026 is 15.3%, split between Social Security and Medicare, and it applies to 92.35% of your net profit.

• Standard Deduction 2026

  Standard deduction amounts for tax year 2026 by filing status, from Revenue Procedure 2025-32: $16,100 single, $32,200 married filing jointly.

• QBI Deduction Thresholds 2026

  Section 199A threshold and phase-in amounts for 2026, plus the new minimum deduction introduced by the One Big Beautiful Bill for this tax year.

• Estimated Tax Safe Harbor 2026

  The three safe harbor tests that protect against an underpayment penalty, and the adjusted gross income threshold that raises the prior-year test to 110%.

• Tax deadlines 2026

  The four estimated payment dates and the filing deadline, with a countdown to the next one.

Pages exist only where the underlying figure has been read from a primary source and recorded with its provenance. A missing page means the number has not been verified — not that it does not matter. Full constant list on the methodology page.