A flexible spending account is a handy tool that lets you put aside pre-tax money for medical expenses that aren’t covered by insurance. It lowers your income tax bill and means that you have money set aside for dental care and contact lenses. The problem with FSAs is that money in the account disappears at the end of the year, which is not necessarily December 31. Starting in 2013, though, there has been a little-known exception to that. [More]