529 education savings plans are powerful tools to help pay for the mounting costs of an education. Yet some people hesitate to use them. One common concern is oversaving. You can only use 529 funds can only cover qualified education expenses without incurring a tax penalty, but it can be hard to pinpoint how much money you actually need. Many parents open 529s for their children at birth, when there’s no way to know whether their kids will earn a scholarship or go to college at all. Fortunately, parents ...