The Mega Backdoor Roth IRA (MBDR for short) takes the benefits of the Backdoor Roth IRA strategy we’ve discussed and magnifies them. If you haven’t already, check out our content on the Backdoor Roth IRA - it provides the foundation for this article. Executive Summary The Mega Backdoor Roth IRA (MBDR) lets high earners put more money into Roth accounts than standard limits allow. It works by making after-tax contributions to your 401(k), then converting them to a Roth Require