Pay periods explained
Biweekly and semi-monthly sound interchangeable and are not. The difference changes the size of every cheque you get — and how your overtime is worked out.
Biweekly and semi-monthly sound interchangeable and are not. The difference changes the size of every cheque you get — and how your overtime is worked out.
| Schedule | Paydays a year | Period covered | Payday falls on |
|---|---|---|---|
| Weekly | 52 | 7 days | The same weekday every week |
| Biweekly | 26 | 14 days | The same weekday, every other week |
| Semi-monthly | 24 | Half a month | Fixed dates, e.g. the 15th and the last day |
| Monthly | 12 | 1 calendar month | A fixed date each month |
These two get confused constantly, and the difference matters more than it looks.
Because 26 > 24, a biweekly cheque is smaller than a semi-monthly one at the same salary. On $52,000 a year, biweekly pays $2,000.00 and semi-monthly pays $2,166.67. The annual total is identical.
Biweekly also produces the famous "three-paycheck months": two months in most years contain three biweekly paydays. It feels like a bonus, but it is simply the 26-payday cycle catching up with the 12-month calendar.
For hourly employees, biweekly is usually the better fit. A biweekly period always contains exactly two complete workweeks, so overtime lines up cleanly. A semi-monthly period slices through the middle of workweeks, and because overtime must still be computed per workweek — not per pay period — payroll has to split hours across cheques. That is a common source of miscalculated overtime.
A workweek is a fixed, recurring period of 168 consecutive hours. Your employer chooses when it starts, and it does not have to be Monday or align with the pay period at all. Overtime is calculated inside each workweek, on its own.
This is why the answer to "did I work overtime?" never depends on your pay schedule. If your workweek runs Sunday to Saturday and you worked 45 hours in it, you are owed 5 hours of premium — whether that week sits neatly inside one cheque or is split across two.
Find out which workweek your employer uses before you try to reconcile a pay stub. It is often in the handbook; if not, ask. Setting the same start day in the timesheet calculator makes your totals line up with theirs.
Because 26 biweekly periods cover 364 days and a year is 365 or 366, biweekly paydays creep forward by a day or two annually. Roughly every 11 years the drift accumulates enough that a calendar year contains 27 biweekly paydays instead of 26. Weekly payrolls hit the same problem with a 53rd payday.
For hourly employees this is a non-event — you are paid for hours worked, so an extra payday just means an extra period of hours. For salaried employees it is a real decision for the employer: divide the annual salary by 27 (each cheque shrinks), keep the normal amount (the year costs about 3.8% more), or adjust the following year. Whichever they choose, it should be communicated in advance.
Nobody is paid the instant a period closes. The gap between the end of a pay period and the payday is the lag or arrears period, typically 3 to 10 days, and it exists so payroll can collect, approve and process timesheets.
Two consequences worth knowing:
State law also sets minimum pay frequencies. Many states require at least semi-monthly payment, some require weekly for manual workers, and monthly-only payroll is restricted or prohibited in several places.
| Schedule | Best for | Watch out for |
|---|---|---|
| Weekly | Hourly and variable-hour staff; industries with high turnover | 52 payroll runs a year — the highest processing cost |
| Biweekly | Most hourly workforces; clean overtime alignment | Three-payday months and the occasional 27th period |
| Semi-monthly | Salaried staff; matches monthly accounting | Overtime split across cheques; paydays land on weekends |
| Monthly | Executives, some international payrolls | Restricted or prohibited for many employees by state law |
Use the hourly to salary calculator to see the same annual figure divided across all four schedules.
Biweekly is every 14 days, giving 26 paydays a year on a fixed weekday. Semi-monthly is twice a calendar month on fixed dates, giving 24 paydays. Semi-monthly cheques are larger; the annual total is the same.
52 weekly, 26 biweekly, 24 semi-monthly or 12 monthly. Roughly once a decade a calendar year contains a 27th biweekly or 53rd weekly payday because of calendar drift.
You are paid biweekly. Twenty-six paydays do not divide evenly into twelve months, so two months in most years contain three of them. It is not extra money — the annual total is unchanged.
Per workweek, always. A workweek is a fixed 168-hour period chosen by your employer. Even on a semi-monthly schedule that splits a week across two cheques, the overtime must still be worked out on the full workweek.
A calendar year that happens to contain 27 biweekly paydays instead of 26, because 26 periods cover only 364 days. Employers either divide the annual salary by 27, absorb the extra cost, or adjust the following year.
You started part-way through a pay period, and payroll runs in arrears — there is normally a lag of several days between a period closing and the payday, so the first cheque covers only the days you actually worked.
Convert an hourly rate to annual pay and back.
Federal rules plus the states that add daily or lower thresholds.
Turn an accrual rate into days and a year-end balance.
Where 2,080 comes from, and the months that break it.
A full week with breaks, overtime, saving and export.