Can an employer change your vacation policy?

Yes, an employer can change your vacation policy. Federal law does not require employers to ever pay for any time that someone does not work. There are also no states that require a paid vacation. There are some states that do have laws that do pertain to vacation policy changes, specifically time accrual and unused vacation.

For example, Nebraska has a law that says paid vacation can be considered part of wages, so an employer can't change policies in a way that takes away vacation time if an employee has already earned it. Although this isn't a law in other states, it can be good practice for any business to follow this when making changes.