Biweekly Pay Calculator

How to use this calculator

Three tabs, each starting from a different place. Pick the one that fits your situation.

From Salary is the most straightforward. Enter your annual salary and the calculator divides by 26 to get your gross biweekly. Add your filing status and an optional state tax rate, and it estimates your net pay. If you know your actual federal withholding rate from a recent pay stub, you can enter that directly to override the estimate.

From Hourly is for hourly employees paid every two weeks. A standard biweekly period is 80 hours (40 hrs/week x 2 weeks). If you regularly work overtime in that period, add those hours separately and pick your overtime multiplier. The calculator figures your gross and then estimates taxes based on your implied annual income.

Net Pay is the detailed tab. Start with a known gross biweekly number, then enter every deduction line by line: federal tax rate, state tax rate, health insurance, 401(k) percentage, and any other deductions. Social Security and Medicare (FICA) are calculated automatically at 6.2% and 1.45% respectively.

The result card shows gross biweekly, net biweekly, annual gross, annual take-home, and your effective total tax rate. The stacked bar chart breaks down each deduction visually so you can see at a glance where your money is going.

The formulas

Everything starts with one calculation:

From there, deductions come off in a specific order:

Pre-tax deductions first:

Pre-tax deductions reduce your taxable wages, which lowers your income tax. They don’t reduce FICA (Social Security and Medicare), which apply to gross wages regardless.

Income taxes on taxable gross:

FICA on gross wages:

Net pay:

The order matters because 401(k) and health insurance come off before income tax is calculated, reducing your tax bill. FICA is always on the full gross.

Worked examples

The 26-paycheck math and the “extra” paycheck months

Biweekly pay creates a quirk that trips people up: two months per year will have three paychecks instead of two. This is predictable and simple, but it feels surprising when it happens.

Here’s the math: 26 biweekly periods divided by 12 months = 2.167 pay periods per month. That 0.167 fractional period adds up to 2 full extra pay cycles per year. Depending on which day of the week your pay cycle falls, those extra-paycheck months occur at different times of year.

It is not extra money. Your annual gross is fixed. The same amount is just distributed into more payment dates during those months.

But it creates a real budgeting opportunity. If your monthly bills are set based on a “two paycheck month,” the third paycheck in those special months feels like found money. Some people use those months to:

• Make an extra payment toward a mortgage or student loan
• Max out an emergency fund
• Boost retirement savings beyond the usual amount
• Handle a planned large purchase without touching savings

The way to find your “three paycheck months” is simple: identify your next pay date, count every 14 days through the calendar year, and find the two months where you land on a pay date three times.

Understanding your W-4 and withholding

The federal income tax on your paycheck is estimated by your employer based on your W-4 form. If your withholding is off, you might owe taxes at filing — or get a large refund, which means you gave the government an interest-free loan.

The 2020 redesign of the W-4 removed allowances and replaced them with a more direct approach:

Step 1: Enter your personal information and filing status.

Step 2: Use this if you have multiple jobs or a working spouse. Leaving it blank assumes you only have one income, which usually over-withholds from your paycheck.

Step 3: Claim tax credits (such as the Child Tax Credit) to reduce withholding.

Step 4: Enter other income that isn’t subject to withholding (like freelance income), additional deductions (like large itemized deductions), or request additional withholding per period.

If you want your withholding to match your actual tax liability more closely, use the IRS Tax Withholding Estimator at irs.gov. Run it mid-year and adjust your W-4 if you’re significantly over or under-withheld.

A big tax refund is not a financial win. It means you over-withheld throughout the year and lost the use of that money. The goal is to owe close to nothing and receive close to nothing.

Pay frequency comparison: biweekly vs. semimonthly vs. weekly

Many people confuse biweekly and semimonthly pay. Here’s how they compare:

For the same $78,000 annual salary, a semimonthly paycheck is $3,250, while a biweekly paycheck is $3,000. The difference per period adds up to the two “extra” biweekly months at year-end.

Semimonthly is more predictable for budgeting. Biweekly is more common in the US (roughly 40% of companies use biweekly pay, compared to about 20% semimonthly).

If you switch jobs and move from biweekly to semimonthly pay (or vice versa), your annual income is the same but your per-period cash flow changes. Budget accordingly.

FICA: the tax that comes out before everything else

FICA (Federal Insurance Contributions Act) is often misunderstood because it doesn’t appear on your W-2 the same way income tax does. But it’s real, automatic, and applies to almost everyone.

Social Security tax is 6.2% of wages up to the annual wage base ($168,600 in 2024). Once your cumulative wages hit that limit for the year, the 6.2% stops being withheld. High earners will notice this late in the year: their biweekly net goes up slightly because Social Security withholding stops.

Medicare tax is 1.45% of all wages with no cap. An additional 0.9% Medicare surtax applies to wages above $200,000 ($250,000 for married filing jointly). Employers withhold the 0.9% surtax once your wages exceed $200,000, but they don’t account for your spouse’s income. If you and your spouse both earn $180,000, you’ll each pay Medicare at 1.45% but together owe the surtax — a common source of underpayment surprises.

Self-employed workers pay both the employee and employer portions of FICA: 15.3% total on net self-employment income (12.4% Social Security + 2.9% Medicare) up to the wage base, and 2.9% Medicare above it. The self-employed get to deduct half of this self-employment tax on their Form 1040 as an above-the-line deduction.

Maximizing take-home pay: practical moves

You can’t avoid FICA and you can’t reduce it through deductions. But you can legally reduce your income tax withholding in several ways.

Maximize pre-tax 401(k) contributions. Every dollar you put into a traditional 401(k) reduces your federal and state income tax withholding immediately. At a 22% marginal rate, a $500/month contribution saves $110/month in federal taxes. The money is still yours — it just grew in a tax-advantaged account.

Use an HSA if you’re eligible. If your employer offers an HSA through a Section 125 cafeteria plan, contributions made via payroll are exempt from FICA and income tax. That’s a full 7.65% + your marginal income tax rate in savings — better than a traditional IRA.

Review your W-4 claims. If you’re getting a large refund each year, you’re over-withholding. Adjusting Step 3 (dependents/credits) or adding a deduction amount in Step 4(b) will increase your take-home each period.

Stack pre-tax benefits. FSAs, commuter benefits, and employer-sponsored life insurance can all come out pre-tax, reducing your taxable wages per period.

Most people accept whatever comes out of their paycheck without questioning it. A 20-minute review of your W-4 and benefit elections can put hundreds of dollars back in your biweekly check without changing your annual income at all.

The bottom line

Your biweekly paycheck is the most concrete version of your income — it’s the number that actually lands in your account. Understanding the gap between gross and net, and what’s driving each deduction, puts you in control.

Use this calculator to verify your current paycheck math, model the impact of a new job offer, or see exactly how much more take-home pay you’d see from a 401(k) reduction or a raise. The stacked bar chart makes the deduction breakdown visual and easy to share.

For most people, the largest deductions are federal income tax and FICA. Everything else is either pre-tax benefits you chose (and which save you money on taxes) or post-tax deductions you can’t avoid. Knowing which is which makes the number on your pay stub a lot less mysterious.