Over the past few months, we have talked a lot about what benefits and incentives matter most to employees. Perhaps unsurprisingly, employees are focused on competitive compensation and other cash-based rewards. But what about the benefits that employees need, but don’t rank as highly?

While vacation days are ranked lower on the list of benefits most important to employee satisfaction, we hear in the news over and over how important it is for employees to recharge out of the office—and how difficult it is to actually take that time. In fact, a recent Oxford Economics study finds that American workers lose 169 million days of paid time off each year. Yet our analysis reveals no clear payoff for employees for sacrificing their time off, as workers who do so are not more likely to get pay raises.

Using paid vacation days is good for everyone. Not only is it beneficial to employees’ health and productivity, it also allow the company to learn to function in their absence, says Megan McArdle in this article from Bloomberg. This raises some questions for management: How can companies ensure that employees are getting away from the office? What can employers do to create a culture that encourages taking well-earned time off?