How PTO and vacation accrual works

Paid time off feels simple until you have to administer it — and then the questions pile up: how fast does it build, is there a cap, does it carry over, do you pay it out when someone leaves? PTO accrual is where those answers live, and it’s both a policy decision and, quietly, an accounting one. (Rules vary by state and this is general guidance, not legal advice.)

Accrual vs. lump grant

There are two broad ways to give PTO. A lump grant hands the employee their full year’s allowance up front. Accrual has them earn it gradually over the year — the more common approach, because it matches time off to time worked and limits exposure if someone leaves mid-year.

Accrual methods

• Per pay period — a fixed amount each paycheck (e.g. a set number of hours every two weeks).
• Per hours worked — PTO accrues as a ratio of hours worked, which suits hourly and variable-hour staff.
• Annual grant with accrual tracking — a hybrid.

The accrual rate is just the annual allowance divided across the chosen basis — a two-week (80-hour) annual allowance over 26 biweekly pay periods accrues about 3.08 hours per period.

Caps and carryover

Policies usually set a cap (a maximum balance you can bank) and a carryover rule at year-end. Some employers use “use it or lose it” — but this is regulated in some states, where accrued PTO is treated as earned wages that can’t simply be forfeited. Carryover and forfeiture rules are a common place employers unknowingly break state law.

Payout at termination

Whether unused PTO must be paid out when someone leaves depends on the state and sometimes company policy. Several states require paying out accrued vacation as wages on the final paycheck; others leave it to policy. Know your state’s rule before you process a departure.

PTO is a liability on the books

Here’s the accounting angle people forget: accrued-but-unused PTO the employer may have to pay out is a liability. As employees bank PTO, the obligation grows; as they take it or it’s paid out, it shrinks. It belongs on the balance sheet, not ignored until someone cashes out.