Biweekly Paycheck Calculator: How to Estimate Your Take-Home Pay

The Mechanics of Biweekly Pay (26 Pay Periods)

A biweekly pay schedule delivers wages once every two weeks, typically on every other Friday. Because a standard year has 365 days (52 weeks and 1 day), dividing 52 weeks by 2 gives 26 pay periods per year.

It is important not to confuse biweekly with semimonthly. Semimonthly payroll occurs twice per month (for example, on the 15th and the last day of the month), yielding exactly 24 paychecks per year. Biweekly paychecks are smaller than semimonthly paychecks for the same annual salary ($Annual / 26 vs. $Annual / 24), but you receive two extra paychecks over the course of the year.

Step-by-Step Biweekly Paycheck Calculation Formula

Calculating your biweekly take-home pay follows a structured mathematical sequence:

Step 1: Determine Gross Wages. For salaried workers: Annual Salary ÷ 26. For hourly workers: (Hourly Wage × Regular Hours up to 80) + (Overtime Wage × Overtime Hours).

Step 2: Deduct Pre-Tax Benefits. Subtract qualifying Section 125 health, dental, and vision insurance premiums, HSA contributions made through a Section 125 cafeteria-plan salary reduction, and traditional 401(k) retirement contributions. This produces your Federal Taxable Wages.

Step 3: Calculate Federal Withholding. Using IRS Publication 15-T percentage tables, compute the federal income tax for the pay period based on your filing status and Form W-4 elections.

Step 4: Compute FICA Taxes. Social Security is 6.2% of FICA wages (up to the 2026 annual limit of $184,500). Medicare is 1.45% of all wages, plus an additional 0.9% on cumulative wages paid over $200,000 in the calendar year.

Step 5: Compute State and Local Taxes. Apply state withholding schedules and mandatory statutory disability or paid family leave deductions (such as California SDI or New York PFL). Note state-specific tax rules: while 401(k) contributions reduce state taxable wages across virtually all states, California does not conform to the federal HSA tax exclusion (nor does New Jersey), leaving employee HSA contributions subject to California Personal Income Tax withholding even when made through a qualifying cafeteria plan.

Step 6: Subtract Post-Tax Deductions. Subtract Roth 401(k) contributions, wage garnishments, union dues, or charitable payroll deductions to arrive at Net Take-Home Pay.

Worked Example: $78,000 Salary on Biweekly Pay

Let us review an employee earning $78,000 annually ($3,000.00 gross per biweekly paycheck) contributing 5% ($150.00) to a pre-tax 401(k) and $50.00 per check toward health insurance:

The "Three-Paycheck Month" Phenomenon

Because 26 paychecks are distributed across 12 calendar months, 10 months have two paychecks and 2 months have three paychecks. Many household budgets are planned around two paychecks per month, making the third paycheck in those two months a prime opportunity to build emergency savings, pay down debt, or invest.

Additionally, some employers only deduct voluntary benefits (such as medical premiums or parking subsidies) across 24 pay periods rather than 26, meaning your third paycheck in those months may have higher take-home pay than usual.