💵 PaycheckEstimates

2026 Paycheck Calculator Methodology & Tax Sources

Last reviewed: September 7, 2026

PaycheckEstimates is a planning tool. We calculate an estimated annual tax amount first, then convert it to monthly or per-paycheck views. Results are intended to help compare salaries and understand common payroll deductions; they are not a tax return, legal advice, or an employer payroll statement.

Important: Actual withholding can differ because of W-4 elections, credits, dependents, bonuses, supplemental wages, local taxes, reciprocity agreements, itemized deductions, pre-tax benefit rules, and employer payroll methods.

Federal income tax

Federal estimates use the 2026 standard deduction and progressive marginal tax brackets. The calculator subtracts supported pre-tax deductions and the standard deduction from annual wages, then applies each federal bracket only to the portion of taxable income inside that bracket.

Social Security and Medicare

For 2026, employee Social Security tax is calculated at 6.2% up to the $184,500 contribution and benefit base. Medicare is estimated at 1.45% on covered wages, with an additional 0.9% withholding amount above $200,000 of wages.

State income tax

Published state calculator pages use state-specific 2026 rules in the shared tax data file. These calculations may include a state standard deduction, exemption, progressive brackets, or a flat rate depending on the state. States with no individual income tax on wages are explicitly treated as zero.

For states that do not yet have a dedicated verified rule, multi-state tools may use a simplified reference rate for planning. Those results are clearly estimates and can differ materially from actual state withholding. Local income taxes are generally not included unless a page explicitly says otherwise.

Employee-paid state payroll programs

Some paycheck deductions are state payroll programs rather than individual income tax. Washington is the most important example in the current calculator: for 2026, Paid Family & Medical Leave has a 1.13% total premium up to the $184,500 Social Security wage cap, and employers may withhold up to 71.43% of that premium from employees. WA Cares is generally 0.58% of gross wages for covered employees and does not use the Social Security wage cap. Actual withholding can differ if an employer pays more of the Paid Leave premium or a worker has an approved WA Cares exemption.

Pre-tax deductions

The main calculator supports a 401(k) contribution and a health-insurance amount. Federal taxable wages are reduced by supported pre-tax deductions, subject to the 2026 employee 401(k) deferral limit. State treatment can differ from federal treatment; for example, Pennsylvania generally taxes employee 401(k) contributions for personal income tax purposes, so the Pennsylvania rule does not simply copy the federal treatment.

Official sources used for 2026

How we keep pages current

Tax-year labels, rates and thresholds are reviewed against primary government sources. When a state has not published enough 2026 guidance to support a detailed implementation, we prefer to disclose a simplified estimate rather than present it as exact. Dedicated state pages are expanded only after the underlying tax rule has been checked.

What the calculator does not model

Questions or corrections? Contact us. You can also review the site disclaimer.