Three-Paycheck Months Calculator

How three-paycheck months work (and the day 1-3 rule)

A biweekly schedule pays every 14 days. Twenty-six checks times 14 days is 364 days, one day short of a year (two in a leap year). So most months hold two paydays, and two months each year pick up a third. Which two depends only on where your cycle sits on the calendar.

You can check any month by hand. It gets a third biweekly payday when one of its paydays lands on or before day (month length minus 28). In a 31-day month, that means a payday on the 1st, 2nd or 3rd. In a 30-day month, it's the 1st or 2nd. February gets a third check only when a payday falls on February 1 of a leap year. A cycle that pays on February 1, 2028, for example, also pays on February 15 and February 29.

A printed table only helps if your first payday matches one of its rows. Starting from a payday you know works for any cycle, Monday and Thursday ones included. Biweekly is the most common schedule in the US private sector, used by 43.0% of establishments in the Bureau of Labor Statistics' February 2023 count. Weekly pay follows the same logic with five-paycheck months: 52 weekly checks leave four extra-check months a year. For the budgeting side of the choice, see biweekly vs semimonthly pay.

26 or 27 paychecks: why 2026 and 2027 both claim the extra check

A year has 27 biweekly paydays (53 weekly) only when its first scheduled payday falls on January 1, or on January 1 or 2 in a leap year. A biweekly cycle lines up that way every 11 or 12 years (a weekly one every 5 or 6). The common Friday cycle that paid on January 2, 2026 lands, 26 checks later, on Friday, January 1, 2027. That's New Year's Day, a bank holiday.

What happens next depends on your employer's holiday rule. If they pay on the business day before, that check goes out Thursday, December 31, 2026, and 2026 gets its 27th payday. The GSA federal payroll calendar works this way: its 2026 schedule lists 27 pay dates ending December 31, and its 2027 schedule lists 26.

If they pay on the next business day, or on the date anyway, the 27th check belongs to 2027. Articles that disagree about which year has 27 paychecks are describing different holiday rules. Either way, as long as your employer sticks to one rule, a 27-check year isn't followed by a 25-check year. The calculator counts paydays under your rule and flags the split when the answer depends on it.

Employers handle the extra check in one of two ways. Some keep each check at salary divided by 26, so at $78,000 you get 27 checks of $3,000, or $81,000 gross for the year. Others divide the salary by 27, so each check shrinks to $2,888.89 and the year still totals $78,000. For a single filer in California, that's $2,255.12 of take-home per check under the first approach and $2,184.17 under the second (2026 tax figures). If your checks got smaller at the start of a 27-pay year, this is the likely reason, and why did my paycheck get smaller covers the other usual causes.

What an extra check actually takes home

The third check isn't taxed at a higher rate. Payroll withholds it under the IRS Publication 15-T percentage method, like every other regular check. The 22% flat rate people worry about applies to supplemental wages such as bonuses, which the Bonus Tax Take-Home Calculator covers. Still, the extra check can come out different from your other two, for two reasons.

The first is the benefits holiday. Many employers spread health, dental and vision premiums over 24 deductions a year, two per month, so the third check of the month skips them. UW-Madison calls these "C paychecks." Take a single California filer at $78,000 who pays $150 per check in pre-tax premiums. At 2026 rates, their regular checks take home $2,159.34 and the extra checks $2,255.12, a difference of $95.78.

The gain is less than the full $150 because the skipped premium turns into taxable wages. To model your own plan, enter your premium under Advanced and tick the skip box. For more on premiums, see how health insurance premiums affect your paycheck or the Health Plan Cost Per Paycheck Calculator.

The second is the Social Security wage base. In 2026, the 6.2% Social Security tax stops once your year-to-date wages pass $184,500. For a single filer on a $200,000 salary in a state with no income tax, a January check takes home $5,691.00 and each of the last two December checks takes home $6,167.92 (2026 figures). That's $476.92 more, because Social Security has already stopped. For the details, see why your paycheck gets bigger after the Social Security cap.

A 27th check also leaves a withholding gap. Withholding tables assume 26 checks, so each check claims 1/26 of your standard deduction and lower brackets, and 27 checks claim 27/26 of them. With 2026 figures, the $78,000 single filer ends the year about $339.62 short on federal income tax, whether the employer keeps the $3,000 check or divides by 27. About $12.58 extra per check on W-4 Step 4(c) closes the gap. The guide to adjusting your W-4 and the W-4 Withholding Planner walk through the form. An employer whose payroll system annualizes at 27 checks would leave a smaller gap.

How this calculator estimates take-home (and what the app does more precisely)

Paydays are counted in whole days, so the dates don't shift with your time zone. Moved paydays follow the Federal Reserve bank-holiday calendar: a holiday on Sunday closes the Monday after, and a holiday on Saturday closes nothing. Federal withholding follows the Publication 15-T percentage method for a W-4 with no adjustments, using 2026 federal figures for every year shown.

Social Security and Medicare are tracked check by check, including the 0.9% Additional Medicare withholding that starts once year-to-date wages pass $200,000 (2026 rules). State tax is a flat effective-rate estimate you can override, and benefit premiums are treated as pre-tax Section 125 deductions. For a full-year view, try the Salary Take-Home Pay Calculator by State or compare schedules with the Paycheck by Pay Frequency Calculator.

The Salary Calculator app goes further. It has full per-state brackets with state items like CA SDI and NY PFL, the full W-4, 401(k) and HSA buckets, and a period grid that shows your net pay across eight pay periods. Saved profiles let you keep a regular check and a benefits-holiday check side by side. Plan every paycheck with Stub44.