Payroll Frequency
Pay periods explained.
A pay period is the span of time in which wages are earned. Weekly, biweekly, semimonthly and monthly schedules differ in both timing and the typical number of payments per year.
Pay period versus pay date
The pay period covers work or salary earned between two dates. The pay date is when payment is issued. A pay stub should show both clearly because they answer different questions.
The payroll frequency affects the gross salary amount per payment and is also used in federal withholding methods. Always use the actual employer calendar rather than assuming dates from the frequency name.
Weekly and biweekly payroll
Weekly payroll commonly produces 52 paydays per year and a pay period covering seven days. Biweekly payroll commonly produces 26 paydays and covers 14 days, although some calendar years can contain an additional payday.
Biweekly does not mean twice per month. Two months in many years contain three biweekly paydays, which affects budgeting but does not convert the schedule into semimonthly payroll.
Semimonthly and monthly payroll
Semimonthly payroll usually produces 24 payments per year, often on two designated dates each month. The number of days in each pay period can vary. Monthly payroll commonly produces 12 payments per year.
For salary calculations, divide verified annual salary by the actual number of scheduled payroll periods. For hourly workers, use actual approved hours within each period rather than an assumed fraction of annual hours.
Why frequency matters for withholding
Federal withholding tables distinguish weekly, biweekly, semimonthly, monthly and other payroll periods. Use current IRS Publication 15-T rather than converting one schedule into another without an authorized method.
Related guides: hourly pay stubs, salary pay stubs and YTD totals.
Frequently asked questions
How many biweekly pay periods are there?
Usually 26, though some calendar years and payroll calendars can produce 27.
Is biweekly twice a month?
No. Biweekly means every two weeks; semimonthly means twice per month.
Can a pay date fall after the pay period?
Yes. Payroll processing commonly creates a delay between the period end and pay date, subject to applicable law.
Reviewed August 26, 2026. Requirements can change. Confirm current federal, state and local rules. This is general education, not legal, tax, accounting or payroll advice. See our editorial standards.
Match every pay stub to the correct period.
Use accurate, authorized source information and review every figure.