How GovCalcs calculates

We build each calculator from primary government sources and re-check them when new figures are released:

• IRS - federal income tax brackets and the standard deduction (Rev. Proc. 2025-32, the 2026 inflation adjustments under the post-OBBBA permanent rate structure), capital gains rates, the Child Tax Credit and EITC (Rev. Proc. 2025-32), Additional Medicare Tax thresholds (Form 8959), and the Uniform Lifetime Table for RMDs (Pub. 590-B).
• Social Security Administration (SSA) - the 2026 Social Security wage base ($184,500), benefit formula bend points, and Full Retirement Age table.
• HHS - the annual federal poverty guidelines used for benefit-eligibility percentages.
• OPM - the FERS annuity formula and TSP matching rules.
• State revenue departments - each state's 2026 income tax brackets, flat rates, and standard deductions, verified per state.

For a paycheck or take-home figure we start from gross annual salary and subtract, in order:

1. Federal income tax - your income after the standard deduction ($16,100 single / $32,200 married filing jointly for 2026) is run through the seven federal brackets (10, 12, 22, 24, 32, 35, 37%). We tax each tier at its own rate, not your whole income at the top rate.
2. State income tax - your state's brackets or flat rate and standard deduction. Nine states levy no wage income tax, and we treat them as $0.
3. Social Security (FICA) - 6.2% on wages up to the $184,500 wage base.
4. Medicare (FICA) - 1.45% on all wages, plus the 0.9% Additional Medicare Tax on wages above $200,000 (single) or $250,000 (married filing jointly).

What remains is your estimated take-home pay. We divide by 12 for monthly and by 26 for a biweekly paycheck.

To stay clear and fast, the calculators assume a straightforward wage-earner case. Unless a specific tool says otherwise, they do not model:

• Pre-tax deductions such as 401(k), HSA, or employer health premiums, which lower taxable income.
• Tax credits (Child Tax Credit, EITC, education credits) unless you are using the calculator built for that credit.
• Local or city income taxes, except where a tool flags them (for example, New York City).
• Itemized deductions above the standard deduction, the senior deduction, or other filing statuses like head of household.
• Self-employment tax, which the self-employment and 1099 calculators handle separately.

Federal figures change every year: the IRS releases inflation-adjusted brackets and the standard deduction in the fall, and the SSA releases the new wage base and COLA around the same time. We update the 2026 figures as those are published and re-verify against the final IRS Revenue Procedure and SSA fact sheet. When a figure is provisional we say so on the tool. Get an email when the new-year figures land: set a tax-year reminder.

Found a number that looks off? That is worth an email - accuracy is the whole point of a calculator. Reach us on the contact page. For your own situation, confirm with the IRS, the SSA, or a tax professional before making a decision.