Take-Home Pay Calculator per Paycheck

Gross-to-net pay is a waterfall in which order determines the answer. Pre-tax deductions such as traditional 401(k) deferrals and health premiums come out first, reducing taxable wages; the standard deduction, 14,600 dollars for a single filer under the 2024 figures used here, is then subtracted; and the remainder passes through the progressive federal brackets of 10, 12, 22, 24, 32, 35 and 37 percent. Only the income falling inside each band is taxed at that band's rate, which is why the effective rate reported alongside the marginal rate is always the lower of the two - the marginal rate answers what the next dollar costs, the effective rate answers what the whole salary actually cost. Payroll taxes follow a different rule and are computed on wages rather than taxable income. Social Security takes 6.2 percent up to an annual wage base, 168,600 dollars in 2024, above which it stops entirely; Medicare takes 1.45 percent on every dollar with an extra 0.9 percent on wages above 200,000 dollars for single filers. One real-world wrinkle this simplified model glosses over is that Section 125 health premiums are exempt from Social Security and Medicare while 401(k) deferrals are not. State tax is entered as a single flat rate, which fits states with flat structures but not California's graduated schedule topping out at 13.3 percent, nor the nine states with no wage income tax at all. Credits, itemized deductions and local taxes are not modeled.

The modern federal income tax dates from the ratification of the Sixteenth Amendment in February 1913 and the Revenue Act that followed the same year, but for its first three decades most Americans paid it in lump sums after the fact. Wartime revenue needs changed that: the Current Tax Payment Act of 1943 introduced withholding at source, so that tax was deducted each payday. The transition problem of owing two years at once was resolved by a plan associated with Beardsley Ruml of R. H. Macy and Company, which forgave much of one year's liability. Payroll deduction is the reason take-home pay, rather than gross salary, became the number most workers actually track. The payroll tax layer grew alongside it. The Social Security Act of 1935 established old-age insurance, with contributions beginning in 1937 at 1 percent each from employee and employer on the first 3,000 dollars of wages. Medicare's hospital insurance tax was added in 1966, and its separate wage ceiling was removed under the Omnibus Budget Reconciliation Act of 1993, effective in 1994, making that portion apply to all earnings. The Affordable Care Act added the 0.9 percent Additional Medicare Tax on high wages starting in 2013. Bracket thresholds have been indexed for inflation since rules enacted in the Economic Recovery Tax Act of 1981 took effect in 1985, and the current bracket structure and enlarged standard deduction come from the Tax Cuts and Jobs Act of 2017.