Mega Backdoor Roth in 2025: Maximize Tax-Free Retirement Savings with This Strategy

A Mega Backdoor Roth is a strategy to put away as much Roth money as you legally can in a given year.

For high-income individuals, the Mega Backdoor Roth comes with many amazing advantages. But don't consider it until you've ruled out other strategies first. You MUST also have an extra $50K set aside without the need for a current tax deduction.

It can be done at any age and there is no phase-out or income limit. The Mega Backdoor Roth is an excellent strategy for maximizing your retirement contributions.

What Exactly is a Mega Backdoor Roth 401K?

Essentially, it's being able to contribute to a Roth in the following amounts:

Under 50: $70,000
Over 50: $77,500

Why are the Backdoor Roth IRA Limits So High

The limits for a Mega Backdoor Roth 401K are much higher than other forms of retirement saving, because a Mega Backdoor Roth is simply a combination of stacking IRA and 401K contributions on 'day 1' and then doing Roth conversions on 'day 2.'

Keep in mind, a Mega Backdoor Roth does not refer to one specific strategy. Rather, it's a bundle of strategies used to get the maximum contributions in a given year. These strategies include:

401ks
IRAs
Conversions
Non-deductible contributions
After-tax contributions

When Should I Use the Mega Backdoor Roth?

Using the Mega Backdoor Roth to maximize your contributions requires strategy. Before you consider this strategy, ask yourself if you've considered or completed the following this year:

Participated in your employer's 401k up to the matching amount
Funded your Roth or Backdoor IRA up to $6K or $7K?
Funded your HSA to the maximum amount?
Funded your spouse's Roth or Backdoor IRA (if applicable)?
Funded your children's Roth IRA (if applicable)?
Funded your parent's Roth IRA (if applicable)?
Funded your child's ESA (Educational Savings Account) up to $2K per child?
Purchased a rental property interest?

At Mark Kohler CPA Attorneys, we advise you don't consider a Mega Backdoor Roth IRA unless you've first explored all the strategies listed above AND have at least $50K set aside in savings, without the need for a current tax deduction.

Steps to Completing the Backdoor Roth Conversion

Next, you must be enrolled in an employer-sponsored traditional 401(k) plan that permits after-tax contributions and in-service withdrawals. If you own a small business, you must adopt the provisions you want in your own Solo 401(k) and won't be dependent on an 'employer'.

Step 1: Make Your Regular Roth an IRA Contribution

Depending on your age, your contribution to an individual Roth can be either $6K or $7K. If you make too much for a regular Roth IRA contribution (phase out is AGI of $129K – $144K if Single, or $204K – $214K if Married), this is where the 'Back Door' method comes into play.

First, make a non-deductible contribution to a traditional IRA, and then convert it to a Roth. Ensure a reporting period has passed before doing the Roth conversion. Next, convert the traditional IRA contribution you just made to a Roth. You have until December 31 of each year to convert as much as you want.

Step 2: Contribute your Roth 401(k)

To build that "Mega Backdoor Roth", max out your annual contributions to your Roth 401k. Depending on your age this will either be a maximum of $23K or $30.5K.

It's critical you indicate this as a Roth contribution. This is allowed at any age and any income level. This WILL NOT be converted to Roth dollars later. It's Roth money from the outset.

Step 3: Consider the Company Match

If you participate in an employer-sponsored plan there is typically a 'match' portion to your 401(k). This money is considered 'traditional'. You will need to convert this to Roth on 'Day 2'.

For those with a Solo 401(k), skip the 'matching strategy' and proceed directly to Step 4: After-Tax Employee Contribution below.

Step 4: Make an After-Tax Employee Contribution

This is where complications can arise. This step depends on your employer's 401(k) plan. The 'math' involves subtracting what 'you' the employee contributed, and any match, from the overall limit. This calculation determines the amount of 'after-tax' contribution.

Step 5: Use the In-Service Withdrawal Provision

The in-service withdrawal provision is a necessary part of the Mega Backdoor Roth process. An employee who makes the after-tax contribution then immediately takes an in-service withdrawal before the contributions generate taxable returns. The "withdrawal" is essentially transferred to a Roth IRA as a 'conversion'. No tax is due, but you didn't receive a deduction either with the contribution in the first place.

Next Level Strategy

Successful clients typically self-direct a good portion of their retirement account. They usually also invest in:

Real estate
Precious metals
Crypto
Small businesses

Diversifying your retirement savings often leads to incredible, lucrative results!

In summary, if the following applies to you, you're in great position to set yourself up for significant retirement savings:

You've checked everything else off your list
You have the extra income
You have a 401(k) plan that makes a Mega Backdoor Roth viable

The Roth truly allows you to enjoy the luxury of tax-free Roth distributions. It also lets you avoid required minimum distributions (RMDs) after age 72.

FAQs

Is a Mega Backdoor Roth Still Allowed in 2025?

Yes, the Mega Backdoor Roth is still allowed in 2025. In 2025, the maximum you can save with a Mega Backdoor Roth is $70,000 for those under 50. For those 50 and older, the limit is $77,500.

Certified as a Tax Advisor By: Mark Kohler

Mark J. Kohler, senior partner at KKOS Lawyers and co-founder of Directed IRA, has over 25 years of experience helping entrepreneurs achieve financial freedom. Through YouTube, books, and live trainings, he breaks down complex strategies into simple, actionable steps. His Main Street Certified Tax Advisor Program now equips CPAs and agents to share these insights with clients.

Disclaimer:

The content provided on this blog is for educational and informational purposes only. It is not intended as legal, tax, or financial advice, and should not be relied upon as such. Laws and regulations vary by jurisdiction and may change over time. Readers are strongly encouraged to consult with a qualified professional—such as a licensed attorney, accountant, or tax advisor—for advice tailored to their specific situation.