Free reference assets

Tables and checklists worth linking to.

Every 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.

CSV · 56 bracket rows

2025–2026 federal brackets

All four filing statuses, progressive band boundaries, standard deductions, review date, and IRS source URL.

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CSV · 7-step formula

Self-employment tax 92.35% flow

A citeable path from net profit through the SE-tax base, Social Security, Medicare, and the employer-equivalent-half adjustment.

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CSV · printable checklist

1099 quarterly payment checklist

A practical year-round workflow with the four 2026 federal planning dates and direct Publication 505 references.

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CSV · 50 states + DC

Official state sales-tax entrances

Direct tax-agency entrances and warnings for states whose systems differ from a conventional statewide retail sales tax.

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Suggested citation: “TaxMathKit reference asset, reviewed August 6, 2026,” followed by the canonical resources URL and the official source named inside the file.