What's new in the numbers
Every changing figure on this site lives in a versioned rule pack with the official source it came from and the date someone opened that source. This page is generated from those packs — not written by hand — so it cannot drift from what the calculators actually use.
- Verified rule packs
- 125
- Awaiting publication
- 3
- Sources cited
- 114
Most recently checked
The date is when someone opened the official document and transcribed the figures — not when the page was last edited.
Where the figures come from
- State revenue departments49
- State unemployment agencies48
- Canada Revenue Agency13
- IRS7
- State labor departments4
- EEOC1
- Employee Benefits Security Administration1
- U.S. Department of Labor1
- Revenu Québec1
What we have not published, and why
3 packs could not be verified against an official source — usually because the agency has not published a current figure, or because its site blocks automated access. Those ship empty and earn no page rather than carrying an estimate, so a missing state here means a missing page, not a wrong number.
- ui-ga-2026
- ui-id-2026
- ui-nm-2026
Every pack is published as raw JSON at /developers and listed with its source on /sources.
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