Unused paid time off does not disappear. It accumulates on the balance sheet as a liability that grows every time salaries rise, and it has been growing quickly. PTO usage has fallen roughly 20 percent since 2020, and accrued vacation balances across U.S. companies now exceed $1 trillion, close to $7,600 per full time worker.
This paper breaks down where that number comes from, what employers are required to record under FASB ASC 710, and why the operational cost of unused PTO is often larger than the accounting one.
Unused PTO is a liability, not a leftover
Most finance teams book paid time off as an expense that lands whenever someone takes a week off. In practice it behaves like debt. Every hour an employee earns and does not use sits on the balance sheet until it is either taken or paid out, and it is revalued upward every time that employee gets a raise. Accrued vacation balances across U.S. companies now exceed $1 trillion, roughly $7,600 for every full time worker.
The balance has grown for a simple reason. People stopped taking time off. PTO usage has fallen roughly 20 percent since 2020, the benefit kept accruing, usage did not keep up, and the gap between the two is now carried on the books.
What the accounting rules require
Under FASB ASC 710, an employer has to accrue for compensated absences when the obligation is attributable to services already performed, the rights vest or accumulate, payment is probable, and the amount can be reasonably estimated. Vacation policies at most U.S. companies meet all four tests, so the liability is not optional and it is not a footnote. It is recognized as it is earned.
Two features make it grow faster than most people expect. The first is that the liability is measured at current pay rates, so every merit cycle quietly increases the value of time that was earned years earlier. The second is separation. Twenty states require employers to pay out accrued, unused vacation when an employee leaves, which turns an accounting entry into cash on a timeline the employer does not control.
PTO is a bigger line than most benefits
Paid leave accounts for close to 24 percent of total compensation costs. That puts it in the same weight class as healthcare and above retirement contributions for most employers. The difference is behavioral. Healthcare and retirement costs are largely fixed by plan design, while PTO cost is driven by whether employees actually use what they have earned. It is the one large benefit line that culture can still move.
Why employees leave the time on the table
Roughly 55 percent of U.S. employees do not use all of their paid vacation, and the reasons are consistent across surveys. Workload comes first, because the work does not stop when the employee does. Perception comes second, with about one in four workers worried that taking time off will make them look less committed.
There is a third reason that gets less attention, and it is the one an employer can actually act on. A significant share of employees do not take the trip because they cannot afford it. The days are available and the money is not, so the time rolls forward into next year and back onto the balance sheet. The Experience Gap looks at why that happens even when the time is available.
The cost that never gets booked
The accounting liability is the part that is easy to see. The operational cost is usually larger. Gallup puts the annual cost of disengagement at more than $1.9 trillion in lost productivity. Burnout shows up long before turnover does, as slower decisions, thinner work quality and more sick days, none of which appear as a PTO line item. The Performance Dividend covers what that leakage looks like inside a team.
The reverse is measurable too. Employers that actively encourage time off report meaningfully lower voluntary turnover, and SHRM has tied benefits satisfaction to roughly a 17 percent lift in overall employee satisfaction. Time off that gets used is time off that stops accruing and starts returning something.
Four ways to turn the liability into a retention advantage
- Measure it before you manage it. Pull the accrued balance by department and by tenure. The concentration usually sits with a small group of long tenured, higher paid employees, which is also where replacement cost is highest.
- Make usage visible and expected. Policy rarely changes behavior, managers do. Leaders who take their own time off, and say so, move usage further than any handbook update.
- Cap the runway carefully. Accrual caps and use it or lose it rules reduce the balance, but several states restrict or prohibit them, so any change needs a legal review before rollout.
- Remove the money barrier. A funded vacation benefit, such as a travel focused lifestyle spending account that employees build through payroll with an optional employer match, converts unused days into used days by solving the constraint that actually keeps people at their desks.
The first three levers manage the number. The fourth changes the behavior that creates it.
What is inside
- Why PTO accounts for nearly 24 percent of total compensation costs, and why it behaves differently from healthcare or retirement contributions
- The accrual rules behind the liability, and the 20 states that require payout at separation
- What Harvard Business Review and the U.S. Travel Association found about the employees who actually use their time off
- Four practical ways finance and HR leaders are turning the liability into a retention advantage
PDF, 5 pages. No form required.
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