P PaycheckIndexUS payroll calculators

Sources and methodology

PaycheckIndex uses 2026 federal withholding schedules, payroll tax constants, and primary government sources to produce planning estimates. State and local rules should be verified before real payroll decisions.

IRS Publication 15-T - Federal Income Tax Withholding Methods IRS Publication 509 - Tax Calendars IRS Publication 15 IRS Publication 15-A IRS Publication 505 IRS estimated tax FAQ IRS Topic 757 - Forms 941 and 944 deposits IRS Form 941 information IRS 2026 tax inflation adjustment release IRS qualified overtime deduction FAQ 26 USC 225 - Qualified overtime compensation deduction SSA contribution and benefit base US DOL state minimum wage laws US DOL overtime guidance US DOL last paycheck guidance 29 CFR Part 778 overtime compensation rules California DLSE final pay guidance California DLSE payday FAQ Alaska state tax facts Alaska Department of Labor 2026 unemployment insurance rates Florida Department of Revenue personal income tax FAQ Nevada Department of Taxation income tax overview New Hampshire Department of Revenue Administration tax overview South Dakota Department of Revenue individual tax overview Tennessee Department of Revenue withholding guidance Texas Comptroller personal income tax overview Washington Department of Revenue income tax forms Washington Paid Leave and WA Cares premium estimator WA Cares employer premium guidance WA Cares exemptions State of Wyoming overview Wyoming unemployment tax rates SBA business management guidance