How to Calculate Take-Home Pay

Gross pay is the total compensation your employer agreed to pay you before any taxes or deductions are removed. It is the number on your employment offer, your salary agreement, or your hourly rate multiplied by hours worked. Take-home pay — also called net pay — is what actually arrives in your bank account after every required and voluntary deduction has been removed.

The difference between the two is substantial. For a typical full-time employee, taxes and deductions reduce gross pay by 25% to 40% or more depending on income level, filing status, location, and benefit elections. Understanding each piece makes it easier to plan a budget from realistic figures rather than from gross income.

Net pay follows this sequence:

Net pay = Gross pay − pretax deductions − federal income-tax withholding − Social Security tax − Medicare tax − state and local taxes − post-tax deductions

Pretax deductions (such as a 401(k) contribution or a health-insurance premium through a Section 125 plan) are subtracted first because they reduce the wage amounts on which certain taxes are calculated. However, the money still leaves your paycheck — it goes to a retirement account or a benefit plan rather than to your bank account. Post-tax deductions (such as a Roth 401(k) contribution or a garnishment) are subtracted after all taxes have been computed.

Employers calculate federal income-tax withholding using the IRS Publication 15-T Percentage Method. The process is:

1. Reduce gross pay by pretax deductions that qualify to reduce federal withholding wages (traditional 401(k) deferrals, Section 125 health premiums, HSA contributions, and similar amounts). 2. Multiply the resulting federal taxable wages by pay periods per year to annualize them. 3. Add any Step 4(a) other income from your W-4 and subtract any Step 4(b) deduction amount. 4. Look up tentative annual withholding in the applicable IRS withholding table based on filing status and whether the Step 2 multiple-jobs checkbox is selected. 5. Subtract annualized Step 3 dependent credits. 6. Divide the result by pay periods per year and add any Step 4(c) extra withholding per paycheck.

The result is never negative — if credits and deductions exceed calculated withholding, the withholding is zero.

Social Security and Medicare taxes are separate from federal income-tax withholding and use their own wage amounts.

Social Security (OASDI) is withheld at 6.2% on covered wages up to the annual wage base. In 2026 that base is $184,500. Once your year-to-date wages from the same employer reach $184,500, Social Security withholding stops for the rest of the year. Traditional 401(k) contributions do not reduce Social Security wages.

Medicare is withheld at 1.45% on all covered wages with no annual cap. Additional Medicare Tax of 0.9% applies when an employer has paid more than $200,000 in wages to an employee from that employer in the calendar year. This employer-level threshold differs from the filing-status thresholds ($200,000 single / $250,000 married jointly) used on Form 8959 when you file your return.

Section 125 health premiums and HSA contributions that qualify as employer-sponsored reduce both Social Security and Medicare wages. Traditional 401(k) deferrals do not.

Pretax deductions reduce one or more taxable-wage bases before taxes are calculated. The exact treatment depends on the type of deduction:

- Traditional 401(k), 403(b), 457, and TSP deferrals: reduce federal withholding wages under IRC § 401(k) but do not reduce Social Security or Medicare wages. - Section 125 health-insurance premiums: reduce federal, Social Security, and Medicare wages when provided through a qualifying cafeteria plan. - HSA payroll contributions: same treatment as Section 125 premiums — reduce all three wage bases when made through an employer plan. - Health FSA and dependent-care FSA contributions: reduce federal, Social Security, and Medicare wages through an employer cafeteria plan.

Because the treatment differs by deduction type, your W-2 will often show different amounts in Box 1 (federal wages), Box 3 (Social Security wages), and Box 5 (Medicare wages).

Paycheck withholding is an ongoing estimate of your eventual annual income-tax bill, collected in installments throughout the year. It is based on your wages and W-4 elections at each employer, not on your complete annual income picture.

When you file your annual tax return, your actual liability is calculated using all income sources, the standard or itemized deduction, credits, and adjustments. If the total withheld across all paychecks and from all employers exceeds your liability, you receive a refund. If it falls short, you owe a balance.

A lower per-paycheck withholding amount is not a tax saving — it means more money in your paycheck now and potentially a larger balance due (or smaller refund) at filing. Adjusting your Form W-4 changes the timing of when tax is collected, not the total amount you owe.