PTO Accrual Calculator

How does PTO accrual work?

PTO accrual means paid time off is earned gradually over the year instead of being granted all at once. With an accrual model, an annual allowance is divided across accrual periods, for example daily, weekly, biweekly, twice monthly, or monthly, so the balance grows steadily toward the annual cap. A lump-sum model grants the full allowance at the start of the cycle. A hybrid model grants part upfront and accrues the rest. Many policies add a waiting period, a number of days after the start date before accrual or use is allowed, and tenure tiers that increase the allowance after set years of service. This calculator uses the same cycle-aware accrual engine that powers Time-Out Zone, which fills the promised annual amount by the end of the cycle rather than over a flat 365 day denominator. Enter the model, frequency, start date, and an as-of date to see how much is earned so far.

The per-period accrual rate (with a worked example)

The per-period rate is the annual allowance divided by the number of accrual periods in the cycle: 15 days accrued biweekly is 15 ÷ 26 ≈ 0.577 days per period; the same allowance accrued monthly is 15 ÷ 12 = 1.25 days per period. A cycle-aware engine counts the actual periods in the cycle (26 biweekly periods, 12 months) so the balance lands exactly on the promised annual amount by the end of the cycle.

The common spreadsheet shortcut, dividing by 365 and multiplying by elapsed days, drifts from the real per-period schedule, undercounting employees whose accrual posts at the end of each period and overcounting mid-period. Over a year the difference is small per person but compounds into payout and carry-over disputes.

Waiting periods, caps, and mid-year changes

Waiting periods come in two flavors: accrual starts immediately but usage is locked, or accrual itself is paused until the waiting period ends. The two produce very different balances at the 90-day mark, so the policy must say which one applies.

Accrual caps stop the balance from growing once it reaches a threshold (often 1.5-2x the annual allowance) until the employee uses time. Tenure tiers change the rate mid-cycle when a service anniversary passes: a correct engine switches the per-period rate from the anniversary forward rather than retroactively recalculating the year.

What happens to the accrued balance at year end is a policy and legal question: carry-over rules and use-it-or-lose-it limits vary by state, and some states require unused accrued vacation to be paid out at separation.