If you are setting up payroll for the first time, "pay period" is one of the first boxes you fill in, and it decides a lot: how often you run payroll, how withholding is worked out, and what dates go on every pay stub. This post explains the term, the four common schedules, and the three dates people mix up: the workweek, the pay period and the pay date.
If you are choosing between two schedules, our post on biweekly vs semimonthly pay compares them in detail. Here the focus is what a pay period is and how it works.
What is a pay period?
A pay period is the stretch of time you pay an employee for on a single payday. It has a start date and an end date, and everything earned between them (hours, salary, overtime) is paid together.
Take a biweekly schedule that runs Sunday to Saturday. The pay period is 4 to 17 April. The employee's hours for those 14 days are added up, payroll runs, and the money lands on the pay date, say Friday 23 April. The next period starts on 18 April. Periods follow each other with no gaps and no overlaps.
A pay period is also called a payroll period. The IRS uses "payroll period" in its withholding tables, because the federal income tax you withhold depends on how many periods there are in a year.
The four common pay periods
| Pay period | Periods a year | When it runs | Full-time hours per period (40 a week) |
|---|---|---|---|
| Weekly | 52 | Every week, same weekday | 40 |
| Biweekly | 26 | Every other week, same weekday | 80 |
| Semimonthly | 24 | Twice a month, often the 1st–15th and 16th–end | About 86.67 on average |
| Monthly | 12 | Once a month, usually the calendar month | About 173.33 on average |
The counts come from IRS Publication 15-T, whose Table 3 lists the number of payroll periods per year for each schedule: 52 weekly, 26 biweekly, 24 semimonthly and 12 monthly. The same table also lists daily (260), quarterly (4), semiannual (2) and annual (1) periods, which small employers rarely use.
Weekly and biweekly periods always have the same number of days, so an hourly employee's pay follows their hours closely. Semimonthly and monthly periods follow the calendar, so they vary in length: a semimonthly period can run from 13 to 16 days. That suits salaried staff, whose pay per period stays the same, better than hourly staff.
Pay period vs workweek vs pay date
These three dates do different jobs, and mixing them up is how overtime gets underpaid.
- Workweek: the Department of Labor defines it as a fixed and regularly recurring period of 168 hours, seven consecutive 24-hour periods. It can start on any day and at any hour, but once set it stays fixed. Overtime under the Fair Labor Standards Act is counted per workweek.
- Pay period: the days one paycheck covers. A biweekly pay period holds two workweeks; a semimonthly period can hold parts of three.
- Pay date (or check date): the day the money is paid. It usually falls a few days after the period ends, so you have time to run payroll. The gap between the end of the period and payroll processing is often called the payroll cutoff.
The DOL's Fact Sheet #23 is direct about averaging: hours can't be averaged over two or more weeks. If someone works 45 hours in week one and 35 in week two of a biweekly period, they are owed 5 hours of overtime for week one, even though the period totals 80 hours. Overtime earned in a workweek is generally due on the regular payday for the pay period in which it was earned.
Do state laws set the pay period?
Yes, in most states. The DOL says the Fair Labor Standards Act doesn't require a particular pay frequency, and it publishes a table of state payday requirements instead. Some examples from that table:
| State | What the DOL table shows |
|---|---|
| California | At least twice during each calendar month, on days designated in advance |
| New York | Manual workers weekly; other options with approval |
| Texas | Exempt employees at least monthly; non-exempt employees at least twice a month |
| Florida | No regulation or not specified |
The DOL table is dated 1 January 2023 and summarizes state law. Before you pick a schedule, check your state labor department's own page for the current rule, especially for hourly and manual workers.
Years with an extra pay period
A year is 52 weeks and one day (two in a leap year), so weekly and biweekly schedules occasionally get an extra payday. 2027 is one of those years for Friday paydays: 1 January 2027 is a Friday, so 2027 has 53 Fridays. A weekly Friday payroll pays 53 times, and a biweekly payroll whose first 2027 payday is 1 January pays 27 times, with the last on 31 December.
Hourly pay isn't affected: people are paid for the hours in each period. Salaried pay is. If you divide an annual salary by 26, a 27th payday means paying more than the salary that year; if you divide by 27, each paycheck is smaller than usual. Decide which before January and tell your staff. Semimonthly and monthly schedules never have this problem, because they always have 24 and 12 periods.
How the pay period shows on a pay stub
A pay stub normally shows the period start and end dates, the pay date, hours or salary for the period, each deduction, net pay, and year-to-date totals. Many states require the pay period dates on the wage statement itself; our guide to pay stub requirements by state lists what each state asks for, with the source for every row.
Two details matter at year end. Year-to-date totals follow the pay date, not the period: a period that ends on 31 December 2026 but is paid on 8 January 2027 counts toward 2027. And the number of periods you set drives the federal withholding calculation in Publication 15-T, so pick the schedule you will really use.
Where PayDocs fits
PayDocs makes the pay stub for each period. You choose weekly, biweekly, semimonthly or monthly, enter the period dates, pay date and the hours or salary, and the stub shows them with year-to-date totals. PayDocs works out federal income tax, Social Security, Medicare and supported state taxes for 2026 pay dates (see what we calculate). Every line is editable, and the preview is free.
This is general information about US federal rules as of 7 October 2026, not tax or legal advice. State rules add to it; check your state's labor and revenue departments.
Questions
What is a pay period?
It is the run of days that one paycheck covers, with a start and end date. Everything earned in those days is paid together on the pay date. Weekly, biweekly, semimonthly and monthly are the common US schedules.
How many pay periods are in a year?
IRS Publication 15-T counts 52 weekly, 26 biweekly, 24 semimonthly and 12 monthly periods. Weekly and biweekly schedules sometimes get an extra payday: Friday payrolls get 53 weekly or, depending on the start date, 27 biweekly paydays in 2027.
Is a pay period the same as a workweek?
No. The workweek is a fixed seven-day, 168-hour period used to count overtime. A pay period can cover one, two or parts of several workweeks. Overtime is worked out per workweek, never averaged across the pay period.
What is the difference between a pay period and a pay date?
The pay period is the days worked; the pay date is the day the money is paid. The pay date usually comes a few days after the period ends, and it decides which year the pay counts toward.
Can I choose any pay period I like?
Federal law doesn't set one, but most states set a minimum frequency, sometimes different for hourly, manual or exempt workers. Check your state labor department before you pick, and keep the schedule regular once set.
Sources
- IRS: Publication 15-T (2026), Federal Income Tax Withholding Methods
- US Department of Labor: Fact Sheet #23, Overtime pay requirements of the FLSA
- US Department of Labor: State payday requirements
- IRS: Publication 15 (2026), Employer's Tax Guide
Sources checked October 7, 2026. This article explains how pay documents work; it is not tax or legal advice.
