If you have a flexible spending account, there is a chance you could lose the untouched FSA funds if you don’t spend them by December 31. Find out if your company has a use-it-or-lose it rule or if it has adjusted in accordance with U.S. Treasury rule changes that allow up to $500 in excess money to carry over to the next benefit year. If you have to follow the use-it-or-lose it rule, spend the money in your FSA before it is gone.