$72,000 SoFi Roth IRA Hack: How to Supercharge Your Retirement in 2026

Watch: How solopreneurs can move up to $72,000 into a SoFi Roth IRA using the Mega Backdoor Roth Solo 401k strategy.

If you’re a solopreneur looking to supercharge your retirement savings in 2026, there’s a powerful — and often overlooked — strategy that can move up to $72,000 into a SoFi Roth IRA in a single year. It’s called the Mega Backdoor Roth strategy, and when paired with an advanced Solo 401k plan from My Solo 401k Financial, it unlocks contribution levels that simply aren’t available with a standard Roth IRA.

In this guide, we’ll break down exactly how the strategy works, why SoFi has become a popular destination for the rolled-over funds, and how you can still use this strategy to fund 2025 contributions retroactively. This information is provided for educational purposes only and is not affiliated with or endorsed by SoFi.

Quick Takeaway: Solopreneurs with a Mega Backdoor Roth-enabled Solo 401k can contribute up to $72,000 in voluntary after-tax dollars in 2026 — and then transfer those funds into a Roth IRA at SoFi (or any custodian of their choice) for tax-free growth potential.

Who Is SoFi — and Why Are Solopreneurs Routing Roth Dollars There?

SoFi markets itself as a one-stop shop for modern finance. It’s an FDIC bank that allows for investing in stocks, ETFs, automated investing with no commission fees, and member rewards. While SoFi doesn’t offer a Solo 401k — and notably doesn’t even allow account holders to bring in their own plan documents like Fidelity or Schwab do — it does offer Roth IRAs and accepts rollovers.

That makes SoFi a popular landing spot for the second leg of the Mega Backdoor Roth strategy: rolling voluntary after-tax Solo 401k funds out of the plan and into a SoFi Roth IRA, where they can grow tax-free.

Bonus Incentive: Based on SoFi’s current marketing, they offer a matching boost on certain rollover amounts (terms apply — verify current eligibility on SoFi’s site). These matches are not 401(k)-style matching contributions — they don’t count against your contribution limit. They function more like a return on investment, adding extra tax-free dollars to your Roth IRA.

The 2026 Roth Contribution Landscape

Before diving into the hack itself, it helps to see the full picture of Roth contribution options available to solopreneurs in 2026. There are three main paths to get money into a Roth account — and they can be combined.

Contribution Type	2026 Limit	Eligibility Notes
Roth IRA	$7,500 (more if age 50+)	Subject to AGI limits — confirm with your tax advisor.
Roth Solo 401k (Employee)	Higher than Roth IRA limit	Requires Solo 401k eligibility (self-employed, no full-time non-owner/non-spouse W-2 employees).
Mega Backdoor Roth Solo 401k	Up to $72,000	Requires an advanced Solo 401k plan that allows voluntary after-tax contributions and in-service distributions.
Combined Potential	Up to $79,500 (more if 50+)	Stack Roth IRA + Mega Backdoor Roth Solo 401k if you qualify and have sufficient self-employment income.

How the Mega Backdoor Roth Solo 401k Strategy Works

The Mega Backdoor Roth is a two-step strategy that lets solopreneurs convert voluntary after-tax dollars into Roth dollars far in excess of standard Roth IRA limits.

Step 1: Make Voluntary After-Tax Solo 401k Contributions

For 2026, eligible self-employed individuals can contribute up to 100% of self-employment income, dollar-for-dollar, as voluntary after-tax contributions — all the way up to the overall $72,000 limit.

Step 2: Transfer the After-Tax Funds to a Roth IRA

Once the after-tax contribution is in the Solo 401k’s voluntary after-tax sub-account, you transfer the funds out of the plan and into a Roth IRA — including a Roth IRA at SoFi. This is what makes the strategy a “mega” backdoor: it’s nearly 10x what you can contribute to a standard Roth IRA.

Example: Maya is a self-employed consultant with $90,000 in 2026 self-employment income and no full-time non-owner W-2 employees. With a Mega Backdoor Roth-enabled Solo 401k from My Solo 401k Financial, she contributes $72,000 as voluntary after-tax dollars, then immediately transfers the funds to her SoFi Roth IRA. Because she also qualifies based on AGI, she contributes an additional $7,500 directly to her Roth IRA — putting $79,500 into Roth accounts in a single year.

Why You Need an Advanced Solo 401k Plan

Just because you’re eligible for a Solo 401k doesn’t mean you’re automatically eligible for the Mega Backdoor Roth. Most off-the-shelf brokerage Solo 401k plans don’t offer voluntary after-tax contributions or in-service distributions, which are both required to make this strategy work.

My Solo 401k Financial was the first Solo 401k provider to offer a plan that enables Mega Backdoor Roth Solo 401k contributions — and our plan documents specifically allow:

Voluntary after-tax contributions up to the full overall annual limit.
In-service distributions of those after-tax funds out of the plan to a Roth IRA — even if you’re under age 59½ and continue to be self-employed.

Important: By default, 401(k) contributions are “trapped” inside the plan until a triggering event (like reaching age 59½). Voluntary after-tax contributions are a key exception — but only if your plan documents allow for in-service distributions of those funds. A standard brokerage Solo 401k typically does not.

Retroactive 2025 Funding: Can You Still Make 2025 Contributions in 2026?

One of the most common questions we receive this time of year is whether it’s too late to fund a Solo 401k for the prior tax year. The answer? It depends. If you filed an extension on your self-employed business tax return and you’re otherwise eligible, you may still be able to set up a plan in 2026 and make certain 2025 contributions.

Business Tax Status	Extended Deadline	2025 Contributions Still Allowed
S-Corp/Partnership (1065)	September 15, 2026	Employer + Voluntary After-Tax (employee deferrals depend on timing)
Sole Proprietor	October 15, 2026	Employer + Voluntary After-Tax (employee deferrals missed if past April 15)
C-Corp	October 15, 2026	Employer + Voluntary After-Tax

So even if you didn’t set up your plan until 2026, you can still make voluntary after-tax contributions for 2025 by your extended business tax return deadline — and then move those funds to a Roth IRA in 2026.

Tax Reporting: How the 1099-R Works for Mega Backdoor Roth Transfers

One important detail to understand: the after-tax contribution itself (Step 1) is not reported on your business or personal tax returns, nor on your W-2 if you’re taxed as an S-Corp or C-Corp.

Step 2 — the transfer from the after-tax account to the Roth IRA — is reportable on a Form 1099-R, and it’s reportable for the year of the transfer. So if you make 2025 voluntary after-tax contributions but transfer to a Roth IRA in 2026, the transfer is reported on a 2026 Form 1099-R.

Good news: My Solo 401k Financial handles the 1099-R reporting at no additional charge. Customers (or their advisors) simply notify us of the transfer in a timely fashion using the form at mysolo401k.net/forms.

What About Dividends That Accumulate in the After-Tax Bucket?

A great question came up during the live session: what if a small amount of dividends accumulates in the after-tax bucket before you convert to Roth?

The answer: you must do a full transfer — moving all the money (basis + gains) from the after-tax account to the Roth bucket. The basis transfers tax-free; the small gains amount will be taxable for the year of the transfer and is reported on the 1099-R. Going forward, all of those dollars enjoy tax-free growth potential like any other Roth funds.

Putting It All Together: Your 2026 Action Plan

Step	Action
1	Confirm Solo 401k eligibility (self-employed, no full-time non-owner/non-spouse W-2 employees).
2	Open a Mega Backdoor Roth-enabled Solo 401k with My Solo 401k Financial.
3	Make voluntary after-tax contributions up to $72,000 (subject to your self-employment income).
4	Open a Roth IRA at SoFi (or your preferred custodian).
5	Transfer voluntary after-tax funds from the Solo 401k to your SoFi Roth IRA.
6	Notify My Solo 401k Financial via the forms page so we handle your 1099-R.

Ready to Supercharge Your Roth IRA in 2026?Whether you’re routing funds to SoFi, Fidelity, Schwab, or another custodian, the Mega Backdoor Roth Solo 401k strategy starts with the right plan documents. My Solo 401k Financial can prepare your plan within the same business day.

Next Step: Get Started Today

Remember: This information is provided for educational purposes only. My Solo 401k Financial is not affiliated with SoFi. Always consult with qualified tax, legal, and investment professionals before making investment decisions with your retirement funds.