According to one study, 13% of managers are less likely to promote workers who take all of their vacation time; according to another, employees who take less than their full vacations earn 2.8% more in the subsequent year than their peers who took all of their allotted days, reports the Wall Street Journal. Thus it’s not surprising that 15% of U.S. employees who are entitled to paid vacation time haven’t used any of it in the past year.

Source: Companies Deal With Employees Who Refuse to Take Time Off by Requiring Vacations, Paying Them to Go