Another caveat: If you have retired, every year after age 70 ½ be sure to take out at least the minimum required distribution from your tax-deferred retirement savings plans (except Roth IRAs) to avoid large IRS tax penalties. (If you are still working at 70 ½ or later, you do not need to start taking minimum distributions from your employer's plan until April 1 of the year following the year you finally retire.)

"Remember, you only have to withdraw the money, you don't have to spend it," said Heather Gratton, an FDIC Senior Financial Analyst. "If you don't need the money you can reinvest it somewhere else, such as in a bank savings account." She added that, because each person's situation is different, it's best to discuss your strategy with your tax or other advisor.