Masters in Business At The Money: The Mega Backdoor Roth
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Feb 19, 2026 
Dan LaRosa, Director of Corporate Retirement Plans at Ritholtz Wealth Management and retirement-plan specialist. He breaks down the Mega Backdoor Roth and how it lets savers dramatically increase tax-advantaged retirement contributions. Short takes cover plan design hurdles, which employers and firms benefit most, and practical steps to implement conversions or in-service rollovers.
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Massive Roth Contribution Amplifier
- The Mega Backdoor Roth lets you contribute far above the standard 401(k) limit by using after-tax contributions inside a 401(k).
- It converts those after-tax dollars into Roth space, enabling much larger tax-free growth than a regular backdoor Roth IRA.
Confirm Plan Features First
- Do check whether your employer's plan permits after-tax contributions and in-plan Roth conversions before assuming you can use the strategy.
- Ask your 401(k) provider and HR because plan design decisions rest with the employer, not the custodian.
Compliance Is The Main Bottleneck
- Many plans don't offer the feature because after-tax contributions and conversions add compliance complexity and testing.
- If compliance testing fails, the mega backdoor Roth strategy can be prevented entirely.