Yes, you usually do accrue vacation while on vacation, but only if your employer awards PTO by pay period rather than by hours actually worked. Companies that grant a flat block of time each pay cycle keep adding to your balance as long as you stay in paid status, and paid vacation counts. Companies that credit a small fraction of PTO for every hour on the clock give you nothing for a week when you logged zero work hours.
Neither federal nor state law forces employers to choose one method over the other, so the answer for your job lives inside your employer’s written policy. Here is how to read it.
The Two Accrual Methods and Why They Behave Differently
Almost every PTO system in the United States uses one of two formulas. The one your employer picked determines whether your balance moves while you are out.
Per-Hours-Worked Accrual
Under this method, you earn a small slice of PTO for every hour you actually work. A common rate is about 0.06 hours of PTO per hour worked, which produces roughly 120 hours (three weeks) over a full-time year of 2,080 hours. Take a week off and you log zero work hours that week, so the formula produces zero new PTO. Your balance sits still until you clock back in.
Part-time employees feel this most. If you already work 20 hours a week instead of 40, your accrual rate is half of a full-timer’s. A vacation week zeroes out accrual for that stretch, and the shortfall compounds across the year.
Per-Pay-Period Accrual
Under this method, you earn a flat amount each pay period, say five hours every two weeks, regardless of how many hours the timesheet shows. The only condition is that you remain on the active payroll in paid status. Paid vacation keeps you in paid status, so the pay cycle runs normally and the accrual posts as usual. Your balance keeps climbing while you are on the beach.
How to Tell Which Method Your Employer Uses
Start with the offer letter, employee handbook, or standalone PTO policy. The language usually gives it away. “Per hour worked” points to the first method. “Per pay period” or “per month of service” points to the second.
If the handbook is vague, look at your most recent pay stub. Many payroll systems print your current accrual rate and running balance directly on the stub, and you can watch what the number does across a pay period that included vacation. If the balance grew, you are on a per-pay-period system. If it stayed flat, you are on a per-hours-worked system.
Written policies are enforceable when the employer has employees acknowledge them in writing, though a handbook by itself is generally not treated as an employment contract. If your handbook says leave is earned monthly while you are employed, the employer typically cannot withhold that earning simply because you took a vacation.1U.S. Department of Labor. Vacation Leave
Union members should check the collective bargaining agreement instead. Negotiated leave articles are often more specific than corporate handbooks, sometimes guaranteeing accrual during the first 30 days of an approved absence or spelling out that all paid leave counts toward accrual.
Watch the Accrual Cap
Many employers set a ceiling on total PTO you can hold at once. Once your balance hits the cap, say 200 hours, no new time accrues until you use enough to drop back below the limit. Taking vacation actually helps here: a week off pulls your balance under the cap and restarts accrual.
A cap is not the same as a use-it-or-lose-it deadline. A cap pauses new accrual but preserves everything you have already earned. A use-it-or-lose-it rule forfeits unused hours by a set date. California, Colorado, Montana, and Nebraska are among the states that prohibit use-it-or-lose-it policies because they treat accrued vacation as earned wages. Most states allow either structure as long as it is communicated clearly in writing.
If you are near the cap, a scheduled vacation is not only rest. It is what keeps your PTO earning at all.
Unpaid and Protected Leave Work Differently
The answer above assumes ordinary paid vacation. Absences that shift you out of paid status, or that fall under a specific federal statute, follow different rules.
Unpaid Leave of Absence
Unpaid leave almost always halts accrual. Most payroll systems trigger accrual only when the pay period generates gross earnings. Zero earnings, zero new hours. Accrual restarts with the next completed paid work period after you return.
FMLA Leave
The Family and Medical Leave Act protects your job for up to 12 weeks of qualifying leave but does not require the employer to keep adding vacation to your balance. The regulation states that an employee “may, but is not entitled to, accrue any additional benefits or seniority during unpaid FMLA leave.”2eCFR. 29 CFR 825.215 – Equivalent Position The FMLA statute says the same.3Office of the Law Revision Counsel. 29 U.S.C. Chapter 28 – Family and Medical Leave Anything you accrued before the leave stays yours and must be available when you return.4U.S. Department of Labor. Fact Sheet 28A – Employee Protections Under the Family and Medical Leave Act
You can substitute accrued paid vacation for otherwise unpaid FMLA leave, and your employer can require it.5eCFR. 29 CFR 825.207 – Substitution of Paid Leave When paid vacation runs concurrently with FMLA leave, you are back in paid status, and if the employer uses per-pay-period accrual, your balance may keep growing during the FMLA absence for that reason.
Military Leave Under USERRA
USERRA treats a servicemember as being on a furlough or leave of absence during military service and entitles the employee to the same non-seniority benefits provided to employees on comparable forms of leave.6GovInfo. 38 U.S.C. 4316 – Rights, Benefits, and Obligations of Persons Absent From Employment for Service in a Uniformed Service Vacation accrual is treated as a non-seniority benefit, so if the employer provides accrual to workers on comparable leave, it must do so during military leave as well. Where the employer offers different benefits for different leave categories, the servicemember gets the most favorable treatment given to any comparable leave type.7eCFR. 20 CFR Part 1002 Subpart D – Rights, Benefits, and Obligations of Persons Absent From Employment Due to Service in the Uniformed Services You may use already-accrued vacation during military service, but the employer cannot force you to.
Workers’ Compensation and Paid Sick Leave
No federal law addresses vacation accrual during a workers’ compensation absence. State law and the employer’s own policy control. Paid sick leave is more predictable: because you stay on payroll in paid status, per-pay-period systems generally keep adding vacation hours during paid sick time. Per-hours-worked systems may still pause. Confirm with your handbook.
If the Policy Is Unclear, Get It in Writing
HR should be able to tell you which accrual method applies and whether accrual continues during paid absences. Ask for the answer in writing. Verbal assurances are hard to enforce later if your pay stub does not match what you were told. For union members, a shop steward can walk you through the relevant article of the collective bargaining agreement.