The two names sound alike and the paychecks look similar, but the schedules behave differently once you add hourly work, overtime, benefits and year-end totals. This post compares them on the points that matter to a small employer, with the federal rules that apply to both and the state rules that can take the choice out of your hands.
The four common pay schedules
| Schedule | When employees are paid | Paychecks a year |
|---|---|---|
| Weekly | Same weekday every week | 52 |
| Biweekly | Same weekday every other week | 26 (27 in some years) |
| Semimonthly | Two fixed dates a month, e.g. the 15th and the last day | 24 |
| Monthly | One fixed date a month | 12 |
The difference between biweekly and semimonthly is two paychecks a year. Biweekly paydays always fall on the same weekday, so the dates move around the calendar. Semimonthly paydays are fixed dates, so the weekday moves, and when a date lands on a weekend or holiday you need a rule for paying early.
What each schedule does to paycheck size
| Biweekly | Semimonthly | |
|---|---|---|
| $52,000 salary, gross per paycheck | $2,000.00 ($52,000 ÷ 26) | $2,166.67 ($52,000 ÷ 24) |
| Hourly worker, 40 hours a week | 80 hours every paycheck | Varies with the dates: about 86.67 hours on average |
| Months with three paychecks | Two a year (in most years) | None |
| Monthly benefit premium of $300 | Usually $138.46 a check over 26 checks, or $150 in 24 checks with two skipped | $150 every check |
For salaried staff, semimonthly gives equal paychecks that line up with monthly rent, loan payments and insurance premiums. For hourly staff, biweekly gives every paycheck the same number of workdays, while a semimonthly period might hold 10 or 12 weekdays depending on the month. Neither changes annual pay; they only slice it differently.
Overtime: why biweekly is simpler for hourly staff
Under the Fair Labor Standards Act, overtime is worked out one workweek at a time. The Department of Labor defines a workweek as a fixed, regularly recurring period of 168 hours, seven consecutive 24-hour periods, and says averaging hours over two or more weeks is not allowed. Overtime earned in a workweek normally has to be paid on the regular payday for the period in which it was earned.
A biweekly pay period is exactly two workweeks, so you add up hours for week one and week two and pay overtime on any week over 40. A semimonthly period cuts workweeks in half: the 1st to the 15th rarely starts on your workweek's first day. You still count overtime by workweek, so a week that straddles two pay periods needs its hours tracked across the boundary. Payroll software handles this; on paper it is the most common source of errors.
Salaried employees who are exempt from FLSA overtime don't raise this problem, which is why many employers pay salaried staff semimonthly and hourly staff weekly or biweekly.
Taxes and withholding
Federal income tax withholding works on both. Publication 15-T's tables and percentage method are built per payroll period, so the employee's Form W-4 is applied to 26 or 24 periods and the annual total comes out about the same. Social Security (6.2%) and Medicare (1.45%) are flat percentages of each paycheck, so the schedule doesn't change them either.
Deposits are a separate calendar. Your federal deposit schedule (monthly or semiweekly) depends on how much tax you reported in a lookback period, not on how often you pay people, as Publication 15 explains. Paying semimonthly doesn't make you a semiweekly depositor, and paying biweekly doesn't make you a monthly one.
The 27-paycheck year
Fifty-two weeks are 364 days, one or two short of a calendar year, so a biweekly schedule drifts a day or two earlier every year. Every so often a calendar year holds 27 paydays instead of 26. Semimonthly schedules never do this.
For hourly staff the 27th paycheck is simply pay for hours worked. For salaried staff you have to decide in advance: divide the salary by 26 and pay an extra check that year, or divide by 27 for that year so annual pay stays the same. Whichever you choose, tell employees early, because it changes each paycheck or the year's total.
State pay-frequency rules come first
There's no federal rule on how often to pay, but most states set a minimum, and some differ by type of worker. The Department of Labor keeps a summary table. It is dated 1 January 2023 and the Department says to confirm with the state labor office, so treat it as a starting point.
| State | Minimum pay frequency listed |
|---|---|
| New York | Weekly for manual workers; semimonthly with approval |
| Massachusetts | Weekly or biweekly for hourly employees; semimonthly for salaried |
| Illinois | Semimonthly; monthly for executive, administrative and professional staff |
| Ohio, Georgia | Semimonthly |
| Texas | Monthly for FLSA-exempt employees; at least twice a month for others |
| Montana | Semimonthly presumed, unless the employer sets other regular paydays |
| No general requirement listed | Alabama, Florida, Nebraska, North Carolina, Pennsylvania, South Carolina |
In a state like New York, a manual worker's schedule is effectively chosen for you. Where both biweekly and semimonthly meet the minimum, the choice is yours.
Which one to pick
- Mostly hourly staff, overtime common: biweekly. Pay periods match workweeks and every paycheck covers the same number of days.
- Mostly salaried staff on monthly benefits: semimonthly. Equal paychecks, premiums split evenly and no 27-paycheck years.
- One household employee, such as a nanny paid by the hour: biweekly or weekly, if your state allows it, so hours and overtime are easy to check.
- A mixed team: some employers run salaried staff semimonthly and hourly staff biweekly. It doubles the payroll calendar, so only do it if the overtime tracking saves more time than it costs.
Where PayDocs fits
The PayDocs paycheck calculator lets you switch between weekly, every two weeks, twice a month and monthly, so you can see the same salary as a biweekly and a semimonthly paycheck, with 2026 federal withholding, Social Security, Medicare and supported state tax. The pay stub generator takes the same four frequencies and the pay period number, and carries year-to-date totals on the stub.
PayDocs doesn't set your payroll calendar, track workweek hours across pay periods or check your state's frequency rule for you. Use it to produce the payday record once you've decided the schedule.
Questions
Is biweekly the same as semimonthly?
No. Biweekly means every two weeks, 26 paychecks a year (sometimes 27). Semimonthly means twice a month on set dates, 24 paychecks a year.
Which pays more, biweekly or semimonthly?
Neither. Annual pay is the same. Each semimonthly paycheck is larger because the year is split into 24 instead of 26, and a biweekly schedule gives two months a year with three paychecks.
How is overtime handled on a semimonthly schedule?
Still by workweek. The FLSA counts hours over 40 in each fixed seven-day workweek, and weeks can't be averaged. When a workweek crosses two semimonthly periods, track its hours across both.
Can I switch from biweekly to semimonthly?
Generally yes, if the new schedule meets your state's minimum pay frequency. Give employees notice, plan the transition paycheck so nobody goes longer than the law allows without pay, and check your state labor office's rules on changing paydays.
Sources
- IRS: Publication 15-T (2026), Federal Income Tax Withholding Methods
- IRS: Publication 15 (2026), Employer's Tax Guide
- U.S. Department of Labor: Fact Sheet #23, Overtime Pay Requirements of the FLSA
- U.S. Department of Labor: State Payday Requirements (dated 1 January 2023)
Sources checked October 4, 2026. This article explains how pay documents work; it is not tax or legal advice.
