2025–2026 federal brackets
All four filing statuses, progressive band boundaries, standard deductions, review date, and IRS source URL.
Download CSVEvery file includes a review date, scope note, and source trail. Download, cite, adapt, or embed them—but verify official instructions before a filing or payment decision.
All four filing statuses, progressive band boundaries, standard deductions, review date, and IRS source URL.
Download CSVA citeable path from net profit through the SE-tax base, Social Security, Medicare, and the employer-equivalent-half adjustment.
Download CSVA practical year-round workflow with the four 2026 federal planning dates and direct Publication 505 references.
Download CSVDirect tax-agency entrances and warnings for states whose systems differ from a conventional statewide retail sales tax.
Download CSVKeep invoices and expenses reconciled, forecast full-year profit, estimate income tax and self-employment tax separately, compare the current-year and prior-year safe-harbor methods, then retain each payment confirmation.
Suggested citation: “TaxMathKit reference asset, reviewed August 6, 2026,” followed by the canonical resources URL and the official source named inside the file.