We all know we should take time away from work. But too often we let our constant busyness and the threat of looming deadlines keep us from going on vacations. This has consequences for our stress levels, our teams, and our organizations. It also costs us. According to research by Project: Time Off, an organization that studies Vacation time in the U.S., most Americans don’t use all of their vacation days. In 2016 alone, U.S. employees ended up forfeiting the equivalent of $66.4 billion in time off. This means that, last year, Americans effectively donated an average of $604 to their employers.

Do you take all of your vacation days? If not, what’s holding you back?

Take this quick Assessment to determine how healthy your relationship is with time off.