How PTO Accrual Works

What Is PTO Accrual?

PTO accrual is the rate at which you earn paid time off. Unlike a single lump of vacation days handed out once a year, many employers let PTO accrue over time — so you earn a little each pay period or each hour you work. Federal law does not require employers to offer PTO at all; when they do, they can choose how it accrues.

The three most common methods are: per pay period (e.g., a fixed number of hours every two weeks), per hour worked (typical for part-time or variable schedules), and annual lump sum (full allowance granted at the start of the year or on your anniversary). Your employer's handbook or HR can confirm which method your company uses.

Per Pay Period Accrual

With per pay period accrual, you receive a fixed amount of PTO every pay period. For example, if you get 80 hours of PTO per year and are paid biweekly (26 pay periods), you accrue 80 ÷ 26 ≈ 3.08 hours each pay period.

This method is easy to predict and is common for full-time employees on a set schedule. It does not change if you work more or fewer hours in a given period — you get the same accrual each time.

Per Hour Worked Accrual

With per hour worked accrual, PTO is tied to the hours you actually work. Employers often use this for part-time or variable-hour employees so that accrual is proportional. To get the rate per hour worked, divide your annual PTO hours by the number of hours you work per year (e.g., 40 hours/week × 52 weeks = 2,080 for full-time).

Example: 80 hours PTO per year ÷ 2,080 hours worked = 0.0385 hours of PTO per hour worked. If you work 80 hours in a pay period, you accrue 80 × 0.0385 ≈ 3.08 hours of PTO that period — the same as the per-period example above when hours are full-time.

Annual Lump Sum

With an annual lump sum, your full PTO allowance (e.g., 80 hours) is granted at once — often on January 1 or your hire-date anniversary. There is no per-period or per-hour formula; you simply have the full balance available (subject to any use-by or carryover rules). This method is simple but gives no mid-year growth; if you use it all early, you have nothing left until the next grant.

Calculation Example

Comparing the Three Methods

Per pay period is easiest to predict and is common for full-time workers. Per hour worked scales with your hours, so it's fair for part-time or variable schedules. Lump sum gives the full balance at once but no mid-year growth. Your employer's handbook or HR can confirm which method you use. For state-specific rules on payout and use-it-or-lose-it, see our PTO laws by state and PTO calculator.