Semi-monthly pay: means employees are paid twice a month on two fixed dates, such as the 15th and the last day of the month, for 24 paychecks a year. Each check is slightly larger than a biweekly check for the same salary, and paydays fall on different weekdays each month.
Key takeaways
- Semi-monthly gives exactly 24 paydays every year, with no 27th-payday problem.
- It suits salaried staff and lines up with monthly accounting and benefits billing.
- For hourly staff it's harder, because pay periods don't line up with workweeks.
- When a payday falls on a weekend or holiday, most employers pay on the business day before.
How semi-monthly pay works
Semi-monthly periods follow the calendar. A common setup pays on the 15th for the 1st through 15th, and on the last day of the month for the 16th through month end. Some employers pay on a lag, for example the 5th and 20th, to give payroll time to process hours. About 19.8% of private establishments use semi-monthly pay according to the BLS (BLS, length of pay period survey).
Because periods vary from 13 to 16 days, the number of workdays in each check changes. For salaried employees that doesn't matter: they receive one twenty-fourth of their salary every time. For hourly employees it matters a lot. A workweek that starts on the 13th and ends on the 19th spans two pay periods, so overtime for that week can only be calculated once the week closes, which often pushes overtime into the following check.
Semi-monthly pay example
Compare a $72,000 salary on two schedules:
| Semi-monthly | Biweekly | |
|---|---|---|
| Paychecks per year | 24 | 26 |
| Gross per check | $3,000.00 | $2,769.23 |
| Hourly equivalent used for partial periods | $34.62 (based on 2,080 hours) | $34.62 |
When a salaried employee starts mid-period, you'll need to prorate. Proration by workdays or by calendar days gives different answers on semi-monthly schedules, so pick one method and document it. The prorated salary calculator handles both.
Why semi-monthly pay matters for employers
Finance teams like semi-monthly pay because payroll expense lands in each month evenly, and benefits that bill monthly split cleanly into two equal deductions. Employees like the predictability of dates, especially for rent and mortgage payments.
The cost is complexity for non-exempt staff. If you employ both salaried and hourly workers, many companies run salaried employees semi-monthly and hourly employees biweekly or weekly. That doubles the number of schedules but keeps overtime clean. Check state rules first: several states require more frequent pay for manual or hourly workers.
Common semi-monthly pay mistakes to avoid
Calculating overtime by pay period
Overtime is per workweek. A 16-day pay period can't be used to average hours.
Using 86.67 hours for every hourly check
That's an average. Hourly staff must be paid for actual hours in each period.
Paying late when the date falls on a weekend
Pay on the prior business day unless your policy and state law say otherwise.
Skipping the written notice when switching
Moving from biweekly to semi-monthly changes cash flow for employees. Several states require advance notice.
Semi-monthly pay: questions people also ask
How many paychecks are there with semi-monthly pay?
What is the difference between semi-monthly and biweekly pay?
What are typical semi-monthly pay dates?
Is semi-monthly pay good for hourly employees?
How do I convert a salary to semi-monthly pay?
Tools, templates, and guides for this topic
Where to go from here
See what helps
Get matched options
Three platforms for your size and states, with pricing ranges.
Start AI MatchGet free quotesHow we wrote this definition
HRTally glossary entries are written by people who have run US payroll, benefits, and HR operations, then checked line by line against primary sources such as the IRS, Department of Labor, EEOC, and Bureau of Labor Statistics. Dollar limits and rates are for 2026 unless stated. We review every entry at least twice a year and whenever a rule changes. This page explains general rules and isn't legal or tax advice; state law can differ. Read our editorial standards.
Sources
Cite this definition
Teachers, consultants, and HR communities are welcome to quote this definition with a link back to HRTally.
<blockquote>Semi-monthly pay means employees are paid twice a month on two fixed dates, such as the 15th and the last day of the month, for 24 paychecks a year. Each check is slightly larger than a biweekly check for the same salary, and paydays fall on different weekdays each month.</blockquote><p>Source: <a href="https://www.hrtally.com/hr-glossary/semi-monthly-pay/">HRTally HR Glossary, Semi-monthly pay</a></p>
Written by the HRTally Research Team
Our guides are written and reviewed by people with hands-on US HR, payroll, and HR technology experience. Legal and tax facts are checked against primary sources, such as the Department of Labor, IRS, EEOC, and USCIS, and linked at the end of each guide. Vendors never review or pay for our editorial content.