Semi-Monthly Payroll Explained: Pay Dates, Calculations and Pros & Cons

Semi-monthly payroll means paying employees twice a month, usually on the 15th and the last day of the month, for 24 paychecks a year. Salaried teams love it because every check is the same size. It also hides a few traps that only show up on payday. Let’s find them first.

Quick answer

• Semi-monthly payroll runs 24 times a year. Biweekly runs 26.
• A standard semi-monthly payroll schedule pays on the 15th and the last day of the month. Weekend dates usually move to the Friday before.
• Salaried pay per check is annual salary divided by 24.
• Hourly pay swings because each pay period holds roughly 9 to 12 weekdays.
• In New York, manual workers must be paid weekly, so check your roles before you pick a schedule.

Table of Contents

• What Is Semi-Monthly Payroll and How Does It Actually Work?
• What Does a Semi-Monthly Payroll Schedule Look Like?
• How Do You Calculate Semi-Monthly Payroll?
• Semi-Monthly vs. Biweekly Payroll: Which One Fits Your Team?
• What Are the Pros and Cons of Semi-Monthly Payroll?
• Which Pay Frequency Mistakes Trip Up New York Employers?
• Why Long Island Businesses Choose Premier Payroll Solutions for Semi-Monthly Payroll
• Conclusion
• FAQs
• Key Takeaways

What Is Semi Monthly Payroll and How Does It Actually Work?

Picture the 15th of the month.

Rent is due on the 1st. Your payroll provider wants numbers by the 12th. And somewhere, a new hire is asking, “Wait, when do I get paid?”

That is payday in one scene.

You pay employees twice a month on fixed calendar dates. Not every other Friday. The date stays put. The weekday moves around. That gives you 24 pay periods a year.

Here is where people mix things up. Semi-monthly is not biweekly, which pays every two weeks and gives you 26 checks. It is also not “bimonthly,” a word that can mean twice a month or every two months, depending on who you ask. Same-sounding names. Very different calendars.

What Does a Semi-Monthly Payroll Schedule Look Like?

A semi-monthly payroll schedule has two pay periods every month. Here is the rest of 2026, weekends included, because weekends always crash the party.

Pay period	Weekdays in period	Standard pay date	Actual pay date
Oct 1 to Oct 15	11	Thu, Oct 15	Thu, Oct 15
Oct 16 to Oct 31	11	Sat, Oct 31	Fri, Oct 30
Nov 1 to Nov 15	10	Sun, Nov 15	Fri, Nov 13
Nov 16 to Nov 30	11	Mon, Nov 30	Mon, Nov 30
Dec 1 to Dec 15	11	Tue, Dec 15	Tue, Dec 15
Dec 16 to Dec 31	12	Thu, Dec 31	Thu, Dec 31

Three things worth knowing:

→ Many employers pay a few days after the period ends. That gap is the pay lag, and it gives you time to approve hours. 

→ When a pay date lands on a weekend, common practice is to pay on the last business day before it. 

→ Some employers pay on the 1st and the 16th instead. Either works. Pick one and never improvise.

One more scene. A new hire starts on the 9th. Their first check needs a prorated amount, bank details, and tax forms before the run closes. Digital HR and onboarding tools get all of that into the system on day one, not on payday.

How Do You Calculate Semi-Monthly Payroll?

Salaried employees first. This is the easy part.

Annual salary ÷ 24 = gross pay per check.

$72,000 ÷ 24 = $3,000. Every time. Under a biweekly schedule, the same salary amounts to $2,769.23 over 26 checks. Same yearly pay. Different rhythm.

Hourly employees are where things get dramatic.

Hours × rate sounds simple. But the October 1 to 15 period has 11 weekdays, or 88 hours. November 1 to 15 has 10 weekdays, or 80 hours. At $22 an hour, that is $1,936 versus $1,760. Same person. Same rate. A $176 gap, and nobody made a mistake. The calendar did it.

Drivers paid by mile, load, or day swing even more, which is why payroll built for trucking companies supports pay by mile, hour, load, or day.

Now take gross pay to net pay:

1. Start with gross pay for the period.
2. Subtract pre-tax deductions such as 401(k) contributions and health premiums.
3. Withhold federal, state, and local income tax.
4. Withhold FICA (Federal Insurance Contributions Act) taxes: 6.2% Social Security and 1.45% Medicare from the employee, matched by you. Current rates and limits live in the IRS Employer’s Tax Guide.
5. Subtract post-tax items such as garnishments.
6. What is left is net pay.

Semi-Monthly vs Biweekly Payroll: Which One Fits Your Team?

Here is the side-by-side, minus the sales pitch.

	Semi monthly	Biweekly
Pay periods per year	24	26
Pay dates	Fixed dates, like the 15th and 30th	Every other week, same weekday
Salaried check	Salary ÷ 24	Salary ÷ 26
Hourly hours per check	Changes (about 9 to 12 weekdays)	Steady (80 hours)
Overtime tracking	Harder, weeks split across periods	Easier, two clean weeks
Three-paycheck months	None	Two per year

Rule of thumb: salaried office teams usually settle into this schedule happily. Hourly teams with heavy overtime usually do better on a biweekly or weekly schedule.

Pick the schedule your overtime can live with.

What Are the Pros and Cons of Semi-Monthly Payroll?

Where It Wins

→ Two fewer pay runs a year than biweekly, so less processing. 

→ Easy budgeting. Twelve months, two checks each. Your accountant will send you a thank-you note. 

→ Predictable pay dates. Employees know the 15th and the last day. Nobody counts Fridays. 

→ Clean benefit deductions. Premiums spread evenly across 24 checks.

Where It Bites

→ Hourly checks vary. Employees notice the 88-hour and 80-hour checks. 

→ Overtime gets messy. Pay periods and workweeks do not line up. 

→ Paydays wander across the weekday calendar. Weekends cause shifts every month. 

→ Longer waits between checks than weekly pay, which matters to hourly staff living paycheck to paycheck.

Most small-business payroll providers can run payroll weekly, biweekly, semi-monthly, or monthly, so the schedule is your call. The only wrong move is choosing it without looking at who you employ.

Which Pay Frequency Mistakes Trip Up New York Employers?

New York has opinions about how often you pay people. Here are the mistakes we see most.

→ Ignoring the manual worker rule. The NYS Department of Labor says manual workers must be paid weekly unless the employer is authorized otherwise. Clerical and other workers must be paid at least twice a month. Many kitchen, warehouse, and field roles can count as manual work, so confirm each role before you lock in a schedule.

→ Running overtime by pay period. Under the FLSA (Fair Labor Standards Act), overtime is calculated on a fixed seven-day workweek, and averaging hours across weeks is not allowed, per DOL Fact Sheet #23. A period ending on the 15th can cut a workweek in half. Your payroll has to split it correctly.

→ Forgetting the weekend. October 31, 2026 is a Saturday. Decide your weekend rule once and tell your team in writing.

→ Mis-prorating partial periods. New hires and last-day exits mid-cycle are where most payroll errors hide.

Why Long Island Businesses Choose Premier Payroll Solutions for Semi-Monthly Payroll

Premier Payroll Solutions runs semi-monthly payroll alongside weekly, biweekly, and monthly, with off-cycle runs for bonuses and corrections. Every client gets a dedicated payroll expert and 24/7 live human support. So when the 31st lands on a Saturday, you call a person, not a phone tree.

The work behind each cycle is specific. Our payroll services handle gross-to-net math, direct deposit, tax filing, and garnishments every run. Time and attendance feeds real hours straight into payroll, so the 88-hour versus 80-hour swing calculates itself. And with 100+ integrations across POS, timekeeping, workers’ comp, 401(k) and accounting tools like QuickBooks, nobody retypes numbers.

Kitchens that need weekly pay get restaurant payroll with built-in tip pooling and POS imports. More than 1,000 businesses nationwide, including 500+ restaurants, trust Premier with their payroll. If this schedule is on your shortlist, ask a team that picks up the phone.

FAQs

How many paychecks does semi-monthly payroll have per year? Twenty-four, two per month. Biweekly has 26 because it pays every two weeks, which creates two three-paycheck months in most years.

What is the difference between semi-monthly and biweekly payroll? Semi-monthly pay is on fixed dates, such as the 15th and the last day. Biweekly pays every other week on the same weekday. Hourly employees see steadier hours on a biweekly basis.

What happens when a semi-monthly pay date falls on a weekend? Common practice is to pay on the last business day before the due date. Write that rule into your payroll policy and tell employees in advance.

Is semi-monthly payroll legal in New York? Yes, for clerical and other workers, who must be paid at least twice a month. Manual workers must be paid weekly unless the employer has state authorization.

How do I calculate semi-monthly pay for hourly employees? Multiply hours worked in the period by the hourly rate. Hours change from period to period, so check weekly overtime separately.

Can I switch from biweekly to semi-monthly payroll? Yes. Give employees written notice, pick your new semi-monthly payroll schedule, and have your provider map the cutover so nobody is paid twice or skipped.

Conclusion

Twice-a-month pay is simple for salaried teams and sneaky for hourly ones. Know your 24 pay dates, do the math per period, and respect New York’s pay frequency rules. Get those right, and payday stops being the scary part of the month.

Key Takeaways

• Semi-monthly means 24 paychecks a year on two fixed dates each month.
• Biweekly means 26 paychecks and creates two three-paycheck months.
• Salaried pay per check is annual salary divided by 24.
• Hourly pay varies because pay periods contain 9 to 12 weekdays.
• Overtime follows the seven-day workweek, not your pay period.
• A clear semi-monthly payroll schedule needs a written weekend and holiday rule.
• New York manual workers must be paid weekly unless authorized otherwise.
• Salaried teams usually fit best with twice-a-month pay, while hourly teams often prefer biweekly pay.
• Mid-cycle hires and exits are the top source of proration errors.
• A dedicated payroll expert beats a ticket queue when payday goes sideways.

Ready to Take Payroll Off Your Plate?

Get a free payroll review or call 631-403-5088 and talk to a real payroll expert today. Payroll handled. Business back on track.