Biweekly vs Semi-Monthly Pay: What's the Difference?
Biweekly pay means 26 paychecks a year; semi-monthly means 24. The difference affects benefit deductions, overtime calculations, and paycheck size.
Biweekly and semi-monthly pay schedules are often confused. They look similar — you receive a paycheck roughly every two weeks — but they are structurally different in ways that affect overtime calculation, benefit deductions, and monthly cash flow.
Biweekly: 26 paychecks per year
Biweekly means you are paid every two weeks on the same day (usually Friday). There are exactly 26 pay periods per year. This aligns naturally with the FLSA workweek (a fixed 7-day period), making overtime calculation straightforward — each pay period covers exactly two workweeks. Two months per year contain three paychecks.
Semi-monthly: 24 paychecks per year
Semi-monthly means you are paid twice a month — typically on the 1st and 15th, or the 15th and last day. There are exactly 24 pay periods per year. Semi-monthly schedules don't align cleanly with the 7-day workweek, which can complicate overtime calculation: a pay period may straddle two workweeks, requiring employers to split hours across weeks when determining OT liability.
Impact on benefits and budgeting
Health insurance and 401(k) deductions are typically split across all pay periods. With biweekly pay, monthly benefit costs are spread across 2.167 periods on average (26 ÷ 12); with semi-monthly pay, it's always exactly 2. Semi-monthly is therefore simpler for monthly benefit accounting. But for employees, biweekly creates predictable two-payday months with occasional three-payday months — good for saving.