- Alabama Dept. of Revenue — Withholding Tax Tables and Instructions (Rev. Jan. 2026), Formula For Computing Alabama Withholding Tax · Monitored
- Arizona Dept. of Revenue — Form A-4 (2026) and Employer's Instructions
- Arkansas Dept. of Finance and Administration — Withholding Tax Formula Method (Eff. 01/01/2026) · Monitored
- California EDD — Withholding Schedules for 2026, Method B (Exact Calculation Method) · Monitored
- Colorado DOR — 2026 DR 1098 · Monitored
- Connecticut DRS — TPG-211, 2026 Withholding Calculation Rules (Rev. 12/25)
- Delaware Division of Revenue — Employer's Guide (Withholding Regulations and Employer's Duties) · Monitored
- Georgia DOR — 2026 Employer's Tax Guide (REVISED June 2026, post-HB 463) · Monitored
- Hawaii Dept. of Taxation — Booklet A, Employer's Tax Guide (Appendix eff. 2026-01-01) · Monitored
- Idaho State Tax Commission — 2026 percentage table · Monitored
- Illinois Dept. of Revenue — Booklet IL-700-T (R-12/25), Automated Payroll Method · Monitored
- Indiana DOR — Departmental Notice 1 · Monitored
- Iowa DOR — 2026 withholding formula · Monitored
- Kansas Dept. of Revenue — KW-100 (Rev. 7-24), Tables for Percentage Method of Kansas Withholding · Monitored
- Kentucky DOR — 2026 withholding formula · Monitored
- Louisiana Dept. of Revenue — Form R-1306 (Eff. 2026) · Monitored
- Maine Revenue Services — 2026 Withholding Tables, Percentage Method · Monitored
- Maryland Comptroller — Employer Withholding Guide, Percentage Method (PM225, 2.25% local rate table) · Monitored
- Massachusetts DOR — Circular M, Percentage Methods (Rev. 12/25)
- Michigan Treasury — 2026 withholding guide · Monitored
- Minnesota Dept. of Revenue — 2026 Income Tax Withholding Instruction Booklet, Computer Formula · Monitored
- Mississippi DOR — 2026 withholding publication · Monitored
- Missouri Dept. of Revenue — 2026 Missouri Withholding Tax Formula · Monitored
- Montana Dept. of Revenue — Employer and Information Agent Guide (V4, Nov. 2025), Montana Withholding Tax Formula
- Nebraska Department of Revenue, Nebraska Circular EN (2026), reflecting LB 1023 (2024) special rules for nonresident employees · Monitored
- New Jersey Division of Taxation — Tables For Percentage Method Of Withholding (Eff. 2020-10-01)
- New Mexico Taxation and Revenue Dept. — FYI-104, New Mexico Withholding Tax (Rev. 11/2025)
- North Carolina Dept. of Revenue — NC-30 (2026), Percentage Method formula tables
- North Dakota Office of State Tax Commissioner — 2026 Income Tax Withholding Rates and Instructions, Section 2 · Monitored
- NYS-50-T-NYS (1/26), p.3 — NY State supplemental wage rate · Monitored
- Ohio Dept. of Taxation — Employer Withholding Taxes, Percentage Method (Eff. 8/1/2026) · Monitored
- Oklahoma Tax Commission — Packet OW-2 (Rev. 11-2025), 2026 Withholding Tables · Monitored
- Oregon DOR — 2026 withholding formulas · Monitored
- Pennsylvania Dept. of Revenue — Employer Withholding (flat 3.07% rate)
- Rhode Island Division of Taxation — 2026 Employer's Income Tax Withholding Tables · Monitored
- South Carolina Dept. of Revenue — WH-1603F (2026), Formula for Computing Withholding Tax · Monitored
- USDA National Finance Center — TAXES 22-28, District of Columbia Income Tax Withholding · Monitored
- Utah State Tax Commission — Publication 14, Withholding Tax Guide · Monitored
- Vermont Dept. of Taxes — GB-1210-2026, Income Tax Withholding Instructions, Tables, and Charts · Monitored
- Virginia Dept. of Taxation — Formula for Computing Tax to be Withheld (eff. 4/1/2024) · Monitored
- West Virginia Tax Division — Form WV/IT-100.2A, Tables for Percentage Method of Withholding (March 2026) · Monitored
- Wisconsin Dept. of Revenue — Publication W-166 (1/26), Alternate Method of Withholding · Monitored
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State withholding formulas
34 of 42 monitored. Every link goes to the agency, not to a summary of it.