PTO accrual calculation: how vacation hours add up

What "accrual" actually means

PTO accrual is how vacation hours add up over time. Instead of getting all your annual PTO at once on January 1, most employers grant a small amount each pay period. By year-end, you've accumulated the full annual allotment.

Example: 80 hours PTO/year, paid biweekly (26 pay periods). Accrual rate = 80 ÷ 26 = 3.08 hours per pay period. After 13 pay periods (about 6 months), you've accrued 40 hours.

Why employers prefer accrual to lump-sum

• Liability matching — the company's PTO liability grows in step with the benefit, instead of spiking at year start
• Reduces departure-day payouts — an employee who leaves in March only gets ~20 hours instead of the full 80
• Discourages "use it all in January" — staffing is more predictable
• Cleaner accounting — the balance sheet doesn't get distorted

The math: typical accrual rates

Annual PTO	Per weekly check	Per biweekly check	Per semi-monthly check
40 hours (5 days)	0.77 hrs	1.54 hrs	1.67 hrs
80 hours (10 days)	1.54 hrs	3.08 hrs	3.33 hrs
120 hours (15 days)	2.31 hrs	4.62 hrs	5.00 hrs
160 hours (20 days)	3.08 hrs	6.15 hrs	6.67 hrs
200 hours (25 days)	3.85 hrs	7.69 hrs	8.33 hrs

Caps and rollover policies

Most employers cap your maximum accrued PTO balance. Common cap policies:

• Annual cap (use-it-or-lose-it) — anything unused at year-end is forfeited. Legal in most US states. Illegal in California, Montana, and Nebraska.
• Rolling cap — you can have up to X hours accrued at any time. Once you hit the cap, accrual pauses until you use some.
• Unlimited rollover — rare, mostly seen in companies with "unlimited PTO" policies (which are functionally equivalent to no formal accrual)

States that require payout at termination

If accrued PTO is considered "earned wages," some states require it be paid out when you leave a job. These include:

• California
• Colorado
• Illinois
• Indiana
• Louisiana
• Maine
• Massachusetts
• Nebraska
• North Carolina (depends on written policy)
• North Dakota

Most other states defer to the employer's written policy. If the handbook says "PTO is paid out at termination," that's enforceable. If it says "PTO is forfeited at termination," that's typically enforceable too.

Tiered accrual based on tenure

Many companies increase accrual rate with years of service:

• 0-2 years: 10 days/year (80 hours)
• 3-5 years: 15 days/year (120 hours)
• 6-10 years: 20 days/year (160 hours)
• 10+ years: 25 days/year (200 hours)

The accrual rate changes on your anniversary date, not January 1.

The "unlimited PTO" trap

Unlimited PTO sounds generous but data is mixed. Surveys consistently show employees with unlimited PTO take 1-3 fewer days per year than those with accrued PTO. Reasons: no accrual visibility, social pressure not to take "too much," and no termination payout incentive.

If you have unlimited PTO, set a personal floor. Treat 15-20 days as the minimum, not the negotiation ceiling.

How to track your own accrual

Don't trust HR systems blindly. They lag, drop hours, and sometimes show wrong rates. A simple spreadsheet works:

1. Note your annual PTO allotment
2. Calculate accrual rate per pay period
3. Subtract any used hours as you take them
4. Cross-reference with your paystub once a month

If your tracked balance doesn't match HR's, that's the time to ask questions, not the day before you submit a 2-week vacation request.

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Last updated May 2026. If something here is wrong or out of date, email contactus@calculatehours.net — we update fast.