2026 Tax Data & Sources

The version of the core calculator included here uses documented 2026 federal income-tax and employee payroll-tax values. State income-tax withholding modules are kept separate and are only shown as calculated when their annual rule is verified.

Federal income tax

2026 federal standard deductions are $16,100 for single or married filing separately, $32,200 for married filing jointly, and $24,150 for head of household. The engine uses the 10%, 12%, 22%, 24%, 32%, 35% and 37% marginal schedules published by the IRS.

IRS: 2026 tax inflation adjustments

Social Security and Medicare

The employee Social Security rate is 6.2% up to the 2026 wage base of $184,500. Employee Medicare is 1.45% with no wage base limit; the engine also estimates additional Medicare using filing-status thresholds.

IRS Publication 15 (2026) · IRS Topic no. 751

What is not included

The calculator does not include federal tax credits, itemized deductions, most local taxes, state income taxes marked for review, employer matching or state-specific payroll programs. Review the disclaimer before using an estimate for an important decision.