The primary documents
Federal: IRS Rev. Proc. 2025-32 (brackets, standard deduction, credits for 2026), IRS Publication 15-T (withholding methods), IRS Publication 15 (employer rules, supplemental wages, FUTA), IRS Notice 2025-67 (retirement limits), Rev. Proc. 2025-19 (HSA limits), Public Law 119-21 (the 2026 deductions), the SSA contribution and benefit base notice. States: each revenue department's 2026 withholding guide or rate notice, named in the row. Local: the Pennsylvania DCED register, the Ohio Department of Taxation municipal and school district tables, the Indiana Department of Revenue county rates, the Comptroller of Maryland's Withholding Tax Facts, the Michigan city tables, the New York IT-201 instructions, and each city's ordinance elsewhere. Labour: the FLSA, 29 CFR Part 541, DOL fact sheets. Prices: BEA regional price parities.