Biweekly vs. semi-monthly payroll: which to choose
A side-by-side breakdown of the two cadences for U.S. small businesses, with the cash-flow, overtime, and offer-letter math that actually decides it.
Most U.S. small businesses choose between biweekly payroll (every two weeks, 26 paychecks per year, almost always paid on Friday) and semi-monthly payroll (twice a month on fixed dates, exactly 24 paychecks per year, almost always paid on the 15th and the last day of the month). The two cadences look identical from across the room and behave very differently once you actually run them. This guide walks through every dimension that matters when you're picking one, in roughly the order they actually decide the choice.
The core arithmetic
Biweekly produces 26 paychecks in a normal year and 27 in a leap-aligned year (the next one is 2026 for many employers). An employee earning $52,000 a year on a biweekly schedule receives $2,000 per check most years and $1,925 per check in the 27-paycheck year — unless you decide to give them an extra paycheck instead, which is what most small employers actually do. Semi-monthly produces exactly 24 paychecks every year, no exceptions. An employee earning $60,000 a year receives $2,500 per check, every check, forever. There is no extra-paycheck year and no leap-year drift.
FLSA overtime and the seven-day workweek
The Fair Labor Standards Act calculates overtime on a fixed seven-day workweek, not on the pay period. Under biweekly payroll, every pay period covers exactly two seven-day workweeks, so you can compute weekly overtime, multiply by two, and post the result to the period. Under semi-monthly payroll, the pay period boundaries cut across workweeks, so you have to track a separate seven-day workweek alongside the pay period and compute overtime independently. For a salary-only workforce this is a non-issue. For mixed teams, the bookkeeping under biweekly is simpler — and the math under semi-monthly is where new employers most often get audited. Payroll software that handles split workweeks correctly is worth more than its monthly cost the first time you owe back overtime to a non-exempt employee.
State wage payment statutes
Several states require semi-monthly payroll as a baseline. California (Lab. Code §204), Texas (Lab. Code §61.011 for non-exempt employees), Illinois (820 ILCS 115/3), and several others require pay at least twice a month with statutory windows for when each half has to be paid. Biweekly satisfies these in practice but is technically a more frequent cadence than the statute requires. Other states require weekly pay by default — Connecticut, Massachusetts (for hourly employees), New Hampshire, Rhode Island, Vermont — with biweekly or semi-monthly permitted only with prior approval or written notice. The state pages on this site flag the relevant statute for each jurisdiction, but you should always confirm with state counsel before deviating.
The cash-flow tradeoff
Biweekly funds payroll on a roughly two-week cycle, which spreads the cash outflow more evenly across the year and keeps individual run sizes smaller. Semi-monthly funds payroll on the 15th and the last day of the month, which concentrates outflows around the same days as most subscription billing, vendor invoices, and rent payments — the worst possible week for a cash-tight startup. If you are running on very thin operating cash, biweekly is the better default for that reason alone.
Equity vesting and grant boundaries
Venture-backed startups overwhelmingly run semi-monthly because option vesting and RSU vesting cliffs typically fall on the 1st and 15th, or the 15th and last day, of each month. Aligning payroll to vesting boundaries means a single date drives compensation, equity, and benefits accrual all at once. Biweekly creates a constant translation problem between the pay date and the vesting date, which most startup CFOs eventually solve by switching to semi-monthly.
Recommended default by workforce type
For an hourly-heavy workforce (restaurant, retail, construction, home health, hospitality), default to biweekly. For a salary-heavy workforce (software, professional services, agencies, consulting, R&D), default to semi-monthly. For a mixed workforce, default to biweekly and absorb the salary-paycheck quirks. Compare what your competitors run if you're hiring against another employer in the same labor market — paycheck cadence is one of those compensation details that recruits notice when it differs from what they had at their last job.
Switching later
You can switch from one cadence to the other, but it's painful in the middle of a calendar year because every employee will end up with a transition pay period that doesn't fit either cadence cleanly. The cleanest switch happens on January 1, when you can let the prior year's last pay period close out under the old cadence and start the new cadence from PP1 of the new year. The switching payroll frequency guide walks through the mechanics if you absolutely have to switch mid-year.