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The mega backdoor Roth strategy is ideally suited for solo 401k plans or owner-only businesses because they are not subject to the complex compliance testing required in larger company plans.
The total value of defined contribution retirement accounts in the United States is nearly $14 trillion.
The mega backdoor Roth strategy allows individuals to contribute up to a potential total of $72,000 into their 401k plan, significantly more than the standard $24,500 limit.
The availability of the mega backdoor Roth feature in a 401k plan is determined by the employer's plan design, not by the custodian.
A primary reason more companies do not offer the mega backdoor Roth is that it adds complexity and triggers additional compliance testing, which can cause the strategy to fail if the tests are not passed.
The mega backdoor Roth strategy is not viable for companies where only the owners and highest-paid employees participate, due to compliance testing failures.
Dan LaRosa states that almost all large technology companies offer the mega backdoor Roth feature in their 401k plans.
The mega backdoor Roth strategy is most suitable for companies where a large percentage of employees are high wage earners, defined as earning over $150,000 to $160,000 per year.
Fidelity is a 401k provider that offers a daily automatic Roth conversion feature, which simplifies the execution of the mega backdoor Roth strategy.
While Fidelity was an early leader in administering the mega backdoor Roth, other 401k providers are now catching up and improving their capabilities for this feature.
A key limitation of the mega backdoor Roth is that funds converted via an in-plan conversion are subject to Roth 401k rules, generally restricting access until age 59 and a half.
The Secure 2.0 Act eliminated the Required Minimum Distribution (RMD) requirement for Roth 401k accounts.