Required minimum distribution (RMD) rules are pretty strict. If you don’t want to face a hefty fine, you must withdraw a certain amount of money every year from tax-deferred retirement plans like 401(k)s  and traditional IRAs after you reach age 70½.  The withdrawals you make are then taxed as ordinary income. Not following these rules can lead to a penalty equal to 50% of the amount that should have been withdrawn, plus regular tax.