 So think about this. You've saved a lot for retirement. You have a great sizable 401k or maybe an IRA. It's a big deal. Congratulations. But that might backfire as you approach the age in which you must take what it's called required minimum distributions. You may have heard that named RMDs. You have to take this at 72, 73 or 75. It all depends on your birth date. And a fat balance means that those RMDs could push you.