Data Tables & References
Free, citable data tables for writers, accountants, teachers, and developers. Every table lists its primary source (IRS, SSA, or state revenue agencies), shows a last-updated date, and includes ready-made citation and embed snippets — so you can quote our numbers without re-typing them.
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2027 Federal Tax Parameters
Every 2026 number in one table: income tax brackets for all filing statuses, standard deductions, LTCG thresholds, Social Security wage base, 401(k)/IRA/HSA limits, and the standard mileage rate — each with its IRS or SSA source.
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Self-Employment Tax Rates 2027
The 15.3% SE tax breakdown, Social Security wage base, additional Medicare thresholds, QBI deduction, half-SE-tax deduction mechanics, and quarterly due dates — with worked calculations.
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Sales Tax Rates by State
State rate, average local rate, and max combined rate for all 50 states plus D.C., with origin vs. destination sourcing notes and economic nexus thresholds for online sellers.
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Freelancer Tax Burden Research 2027
Original analysis: total federal + SE + state tax burden for self-employed filers across income levels and states, computed from the 2026 parameters on this site, with full methodology.
How to use these tables
Every page in this section follows the same rules: the numbers come from a named primary source, the simplifications we make (for example, representative flat state rates) are stated on the page, and each page carries a citation snippet in APA style plus an HTML link you can paste into your own article. You may reproduce tables with attribution; you may not resell them or present them as your own original data.
Accuracy and updates
Tax parameters on this site are stored in a single source of truth and cross-checked by automated consistency tests on every build, so the calculators and these reference pages always agree. When the IRS or SSA announces revised figures, we update the source data and the pages change with it — the last-updated note on each page tells you which revision you are looking at. If you spot a discrepancy, the contact page is the fastest way to reach us.
Who these tables are for
Writers and editors use them to fact-check a figure without opening a PDF; accountants and bookkeepers use them as a quick cross-reference during client conversations; teachers and course builders embed them in slides and handouts; and developers use them as test fixtures for their own calculators, because every number here can be traced to the IRS or SSA document that produced it. If you are citing a table in published work, cite the primary source too — our pages make that easy by listing the exact revenue procedure, notice, or SSA fact sheet each figure came from.
Data update history
| Date | Change |
|---|---|
| July 2026 | Added the 2026 federal tax parameters page and the freelancer tax burden research (50-state analysis); synced the self-employment tax page to the SSA 2026 wage base. |
| May 2026 | Sales tax by state table expanded with economic nexus thresholds and origin/destination sourcing notes for online sellers. |
Frequently asked questions
Can I copy a table onto my own website?
Yes, with attribution. Keep a visible link to the page you copied it from, and don't alter the numbers. The embed notes on each data page explain the two-line HTML snippet approach that keeps the link intact.
Do I need permission to cite a number?
No. Citing facts with attribution is always fine — that is what the citation blocks are for. The restriction above only covers wholesale republication.
How current are the figures?
Each page carries a last-updated date. The 2026 parameter pages reflect the IRS's late-2025 inflation adjustments (Rev. Proc. 2025-32 and related notices) and the SSA's 2026 taxable maximum, and they are the same values our calculators use.
What if I find an error?
Tell us through the contact page. Every report gets checked against the primary source, and corrections land in the next build — the update history above records what changed.