The IRS requires owners of tax-deferred retirement accounts like IRAs and 401(k)s to take annual required minimum distributions (RMDs) beginning at age 70 1/2. The RMD amount is based on the account value and the owner's life expectancy. Failure to take the RMD results in a 50% penalty on the amount that should have been withdrawn. Deciding when and how to take RMDs is an important part of an overall retirement strategy due to the tax implications. Owners should consult financial and tax advisors to ensure RMDs do not cause unwanted tax surprises.