If your plan does not offer a grace period your funds may rollover to the next plan year. This provision will be part of the plan rules established by your employer.
The Rollover option lets you roll over up to $500 remaining in your account from one plan year to the next. You don’t have to worry about losing money left unspent in your account at the end of the plan year, or the end of a run-out. To confirm if your plan offers a run-out log into your online account.