The required minimum distribution rules apply to all employer sponsored retirement plans, including profit-sharing plans, 401(k) plans, 403(b) plans, and 457(b) plans as well as traditional IRAs and SEPs. These rules also apply to Roth 401(k) accounts. However, the required minimum distribution rules do not apply to Roth IRAs while the owner is alive.
Required Minimum Distributions (RMDs) generally are minimum amounts that you as an account owner must withdraw annually starting with the year that you reach 73 years of age or, if later, the year in which you retire. However, if the retirement plan account is an IRA or you are 5% owner of the business sponsoring the retirement plan, the RMDs must begin once you reach age 73, regardless of whether or not you are retired.
You as the IRA owner are responsible for taking the correct amount of RMDs on time every year from your accounts and may face stiff penalties for failure to take RMDs.