A Mega Backdoor Roth IRA is an advanced retirement savings strategy that allows high earners to put more money into a Roth account than usual by using their 401k plan. If the plan allows, you can make extra after-tax contributions to your 401k and then move that money into a Roth IRA or Roth 401k, letting it grow tax-free. This strategy is especially helpful for people whose income is too high to contribute directly to a Roth IRA. Not all 401k plans support this feature, so it’s important to check your plan’s rules. The “mega” part refers to the much larger amounts you can potentially convert compared to a standard Roth strategy.