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What is Mega Backdoor Roth? How Does Mega Backdoor Roth Work?

The Mega Backdoor Roth is a strategic approach that involves making after-tax contributions to a 401(k) and converting them to a Roth IRA or Roth 401(k) for potential tax-free growth and withdrawals in retirement.

by Kowsalya

Updated Aug 23, 2023

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What is Mega Backdoor Roth? How Does Mega Backdoor Roth Work?

What is Mega Backdoor Roth?

The concept of a mega backdoor Roth presents a valuable opportunity to transfer funds from your 401(k) into a Roth IRA, potentially leading to tax-free growth in your investment portfolio. This approach, however, might not be suitable for everyone, as its effectiveness hinges on certain criteria.

According to Jeff Busch, a partner and representative specializing in investment advising at Lift Financial in South Jordan, Utah, the mega backdoor Roth 401(k) conversion can serve as a beneficial financial tool. It allows individuals to capitalize on tax advantages by generating tax-free returns on investments. Nevertheless, it's essential to recognize that this strategy might not align with everyone's financial circumstances.

For the mega backdoor Roth to be viable, your employer's traditional 401(k) plan needs to permit two key features: after-tax contributions and in-service withdrawals. After-tax contributions refer to the ability to invest money that has already been taxed, potentially allowing for future tax-free withdrawals. In-service withdrawals, on the other hand, grant you the flexibility to withdraw funds from your 401(k) even while you're actively employed by the company.

It's crucial to note that even if your employer's plan supports after-tax contributions and in-service withdrawals, the decision to pursue a mega backdoor Roth should be contingent on your individual tax situation. While the strategy presents appealing prospects for tax-free growth, it must align with your broader financial and tax strategy to maximize its benefits.

In essence, the mega backdoor Roth strategy is a dynamic approach to financial planning, offering the chance to convert funds from a 401(k) to a Roth IRA with potential tax advantages. However, its suitability varies among individuals and is contingent on specific plan features and personal tax considerations. Consulting with a financial advisor is advised to determine if this strategy harmonizes with your overall financial goals.

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How Does Mega Backdoor Roth Work?

If you're considering embracing the mega backdoor Roth strategy, it's important to acquaint yourself with its operational steps. Below is a concise outline of the fundamental stages:

  • Pre-tax Contributions: Begin by maximizing your pre-tax contribution to your 401(k) within the annual limit. For the year 2023, this cap stands at $22,500 across all accounts. If you're aged 50 or above, you can contribute up to $30,000.
  • After-tax Contributions: Once your pre-tax contribution has reached its limit, you have the opportunity to supplement it with extra after-tax contributions, up to the entire 401(k) yearly threshold. In 2023, this overall limit is $66,000, or $73,500 for those aged 50 and over. This cumulative ceiling encompasses your personal contributions, employer contributions, and after-tax contributions.
  • Roth Conversion: The concluding phase involves transferring your after-tax contributions either into a Roth IRA or converting them into a Roth 401(k), if your plan allows for this conversion. This maneuver enables the funds in your account not only to flourish tax-free but also to be withdrawn sans taxation during your retirement years. It's crucial to recognize that these conversions could trigger tax implications, making it advisable to seek guidance from a tax professional who can provide insights tailored to your specific circumstances.

However, there are certain conditions and considerations associated with employing this strategy. One requirement is that your plan should permit in-service distributions or conversions to a Roth account. In-service distributions involve withdrawals made while you're still actively employed.

If your intention is to convert your after-tax contributions into a Roth 401(k) but you're uncertain about whether your plan facilitates this, it's prudent to communicate with your HR department or plan administrator. It's also highly recommended to engage a financial advisor or tax expert prior to executing this strategy or any other investment tactic. Their expertise can offer valuable insights suited to your unique financial situation.

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Mega Backdoor Roth Limit 2023

Just like other retirement savings strategies, there are annual limits to the amount you can contribute to a mega backdoor Roth IRA. Determining your contribution limit involves considering the maximum 401(k) contribution limits and whether your employer offers matching contributions. Here's a step-by-step breakdown of how to calculate your mega backdoor Roth IRA contribution limit:

  • In 2023, the total cap for 401(k) contributions, encompassing pre-tax, after-tax, employer matching contributions, and other non-elective employer contributions, is set at $66,000 (increased from $61,000 in 2022). If you're 50 years old or older, this cap rises to $73,500 (up from $67,500 in 2022).
  • Start by deducting the pre-tax contribution you intend to make for the year - $22,500 ($30,000 for individuals over 50) - from the total 2023 401(k) contribution limit.
  • The outcome represents the maximum feasible contribution to a mega backdoor Roth IRA for 2023, assuming your employer doesn't provide any 401(k) contributions on your behalf. This calculated value is $43,500 (increased from $40,500 in 2022).
  • In cases where your employer offers matching 401(k) contributions, factor in that amount as well. For instance, if your annual income is $200,000 and your employer matches 3% of your salary, subtract the extra $6,000 in matching contributions ($200,000 x 0.03). This leaves you with a maximum mega backdoor Roth IRA limit of $37,500 for 2023.

It's important to note that these calculations provide a clear understanding of your contribution threshold for a mega backdoor Roth IRA. However, everyone's financial situation is unique. Consulting with a financial advisor is highly recommended to ensure accuracy and alignment with your overall retirement strategy.

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Mega Backdoor Roth Turbotax

To enter a Mega Backdoor Roth contribution in TurboTax, you will need to follow a few steps. Here is a general overview of the process:

  1. Navigate to the "Federal Taxes" section of TurboTax.
  2. Select "Wages & Income" and scroll down to the "Retirement Plans and Social Security" section.
  3. Select "IRA, 401(k), Pension Plan Withdrawals (1099-R)" and then select "Continue".
  4. Enter the information from your 1099-R form, including the distribution code for the Mega Backdoor Roth contribution (usually "2" or "8").
  5. TurboTax will then prompt you to enter additional information about the contribution, such as the amount of after-tax contributions and the date of the contribution.
  6. Once you have entered all of the necessary information, TurboTax will automatically calculate the taxable amount of the contribution.

It's worth noting that the process for entering a Mega Backdoor Roth contribution in TurboTax may vary depending on your specific situation and the version of TurboTax you are using. If you are unsure about how to enter your contribution, you may want to consult TurboTax's help resources or consider speaking with a tax professional.

Mega Backdoor Roth Withdrawal Rules

Navigating the withdrawal rules for a Mega Backdoor Roth can be intricate and is contingent upon the specific attributes of your 401(k) plan. The feasibility of executing the Mega Backdoor Roth hinges on whether your plan permits in-service withdrawals to a Roth IRA or in-plan rollovers to a Roth 401(k). The following points elaborate on this process:

  • In-Service Withdrawals and Rollovers: Should your 401(k) plan facilitate in-service withdrawals to a Roth IRA or in-plan rollovers to a Roth 401(k), you have the green light to proceed with the Mega Backdoor Roth strategy. This approach empowers you to shift funds into a Roth vehicle, potentially reaping tax benefits.
  • Plan Limitations: Conversely, if your plan doesn't endorse in-service withdrawals to a Roth IRA or in-plan rollovers to a Roth 401(k), your ability to undertake the Mega Backdoor Roth strategy may be deferred until you transition out of your current job. The possibility of engaging in this strategy becomes contingent upon your employment status.
  • Pro Rata Rule: An important caveat to consider is the pro rata rule. This stipulation underscores that if your traditional 401(k) balance encompasses a combination of pre- and post-tax money, an in-service withdrawal of post-tax contributions alone might not be feasible. The rule prevents exclusive withdrawals of post-tax contributions when there's an amalgamation of both pre- and post-tax funds within your traditional 401(k).

In essence, the Mega Backdoor Roth strategy's execution is contingent upon the characteristics of your 401(k) plan. Your eligibility rests on whether your plan supports in-service withdrawals to a Roth IRA or in-plan rollovers to a Roth 401(k).

If these options are viable, you can potentially benefit from tax advantages. However, if these avenues are restricted, your ability to employ the Mega Backdoor Roth approach might be postponed until your employment circumstances change.

Furthermore, the pro rata rule serves as a factor that affects the exclusivity of post-tax contribution withdrawals, especially when combined with pre-tax funds in your traditional 401(k) balance. Consulting with a financial expert is recommended to navigate these intricacies based on your specific circumstances.

Who is Eligible for a Mega Backdoor Roth?

Your eligibility for the mega backdoor Roth strategy is primarily contingent upon the specific provisions of your employer-sponsored retirement plan. Consider the following points when evaluating your eligibility:

  • 401(k) Plan Regulations: The retirement plan offered by your employer should allow after-tax contributions that surpass the regular pre-tax or Roth contribution limits. In the year 2023, these maximum limits stand at $22,500, but if you are 50 years old or above, you can contribute up to $30,000.
  • In-Service Distributions or Conversions: Your employer's retirement plan must grant you the ability to make either in-service distributions or conversions to a Roth account. These options enable you to transfer your after-tax contributions into a Roth IRA or convert them to a Roth 401(k) even while you are still employed.
  • Sufficient Funds: Naturally, having adequate financial resources is crucial. Initially, you need the means to contribute the maximum allowed amount to your 401(k), which is $22,500 for the year 2023, or $30,000 if you're aged 50 or older. Subsequently, you must also possess additional funds beyond the standard limit, which will be used for executing the mega backdoor Roth strategy.

In essence, your eligibility to engage in the mega backdoor Roth strategy revolves around your employer's retirement plan provisions. The plan must enable after-tax contributions exceeding standard limits, offer in-service distributions or conversions to a Roth account, and you must have both the financial capacity to make substantial contributions and the additional funds necessary for this strategy.

What Are the Alternatives to a Mega Backdoor Roth?

Engaging in mega backdoor Roths can be intricate and potentially lead to unintended tax consequences if not managed carefully. Here are some alternative avenues to enhance your retirement savings:

  • Roth 401(k) Contributions: If your employer provides a Roth 401(k) option, a simpler choice is to contribute directly to it. However, keep in mind that you'll be confined to the annual 401(k) elective deferral limit, which is $22,500 for 2023, or $30,000 if you're aged 50 or above.
  • Maximize Roth IRA Contributions: Depending on your income, you can directly contribute to a Roth IRA instead of opting for a backdoor approach. Individuals under 50 years old with a single filing status must earn less than $138,000 in 2023 to contribute the full $6,500 to a Roth IRA. For married couples filing jointly, the income threshold for making the full contribution is $218,000 for the year.
  • Leverage Health Savings Accounts (HSAs): If your health plan permits, another avenue to boost your tax-advantaged savings is through an HSA. HSAs enable you to contribute pretax funds, with the limit being $3,850 for individual coverage and $7,750 for family coverage in addition to a $1,000 catch-up contribution for those aged 55 or above. These funds can be utilized for qualified medical expenses, and withdrawals are tax-free. Furthermore, HSAs allow for investment, acting as an extension of your retirement savings. Given the escalating health care costs in retirement, HSAs can be invaluable, as research by Fidelity Investments suggests a retired couple at age 65 in 2022 may require around $315,000 to cover medical expenses.

Ultimately, the key takeaway is that any form of savings holds more value than none at all. The mere fact that you're contemplating a mega backdoor Roth indicates your proactive approach towards securing your financial future.

What Are the Criteria to Determine if You Are Eligible for a Mega Backdoor Roth?

According to Sources, there are a couple of crucial factors you must be aware of within your 401(k) plan before determining your eligibility for a mega backdoor Roth strategy:

  • Employer Match Consideration: The first aspect is understanding the extent of your employer's match, as this will be subtracted from the potential after-tax contribution you can make. This step is pivotal in comprehending the scope of your potential contribution.
  • In-Service Distributions: Another pivotal point is whether your 401(k) plan permits in-service distributions, which, as stated by Busch, is "the key to making this strategy work." This provision is vital for the effective execution of the mega backdoor Roth strategy.

Should your plan not allow in-service distributions, you won't be able to carry out the conversion until you depart from your current employment. This delay could result in accrued earnings on your after-tax contribution, which would then be subject to taxation during the conversion process. Essentially, this could lead to a substantial tax liability, so it's essential to be prepared for such potential financial implications.

If you're uncertain whether your plan permits in-service distributions, reaching out to your HR department is a prudent course of action. Their insights can provide clarity on this crucial aspect of your plan and assist you in making informed decisions regarding the mega backdoor Roth strategy.


What is Mega Backdoor Roth-FAQs

1. What is a Mega Backdoor Roth?

 A Mega Backdoor Roth is a financial strategy that allows individuals to contribute additional after-tax funds to their employer-sponsored 401(k) plan, and then subsequently convert these after-tax contributions into a Roth IRA or Roth 401(k). 

2. How does the Mega Backdoor Roth strategy work?

The strategy involves making after-tax contributions to your 401(k) beyond the standard pre-tax and Roth contribution limits. 

3. What are the benefits of a Mega Backdoor Roth?

The primary benefits include the potential for tax-free growth on investments and tax-free withdrawals in retirement. 

4. Who is eligible for the Mega Backdoor Roth strategy?

Eligibility depends on the features of your employer's 401(k) plan. Your plan must allow after-tax contributions beyond the regular pre-tax or Roth contribution limits. 

5. Are there any risks or considerations with the Mega Backdoor Roth strategy?

While the strategy offers potential benefits, it's important to carefully consider the tax implications, especially if you have a mix of pre-tax and post-tax funds in your 401(k) account.

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