Solo 401k vs. SEP IRA vs. Roth IRA: Which Retirement Account Should You Fund?
There’s a specific kind of financial paralysis that happens when you’re a content creator, freelancer, or solopreneur clearing well over six figures.
You know you should be saving for retirement. You’ve heard of a Solo 401k. Your accountant may have mentioned a SEP IRA. You know Roth IRAs exist. And every time you sit down to figure out which one to use, you end up with seventeen browser tabs open and no decision made.
Here’s the problem: picking the wrong account—or funding accounts in the wrong order—can cost a high-earning self-employed professional thousands of dollars per year in unnecessary taxes and missed compounding opportunities. And in a world where your income might vary significantly from year to year, the decision is less about which account is “best” in the abstract and more about which one fits your specific income structure, flexibility needs, and long-term tax picture.
As a fiduciary financial advisor working with solopreneurs, content creators, and other self-employed professionals in Los Angeles and the surrounding area, this is a common planning conversation I have. Let me break down all three accounts clearly so you can make an informed decision—and ideally, use more than one of them strategically.
The Foundation: Why Retirement Accounts Matter More for the Self-Employed
Before comparing accounts, it’s worth grounding this in why it matters. When you’re self-employed, you have no employer matching your contributions, no automatic payroll deductions happening on your behalf, and no HR department nudging you toward a retirement plan each quarter. Every dollar that goes into a retirement account is a dollar you chose, at the right time, for the right reason.
The upside is that the self-employed actually have access to some of the most powerful retirement vehicles available—if they use them correctly. The contribution limits available through a Solo 401k or SEP IRA dwarf what a W-2 employee with only an employer plan can access. Used strategically, these accounts can shelter tens of thousands of dollars from state and federal taxes every year—which, in California, where income taxes are among the highest in the nation, represents a significant and recurring financial benefit.
Account #1: The Solo 401(k)
What it is: A 401(k) plan designed specifically for self-employed individuals with no full-time employees other than a spouse.
2026 contribution limits: The total annual contribution limit for a Solo 401k in 2026 is $70,000 (plus a $7,500 catch-up contribution if you’re 50 or older). This limit comes from two sources: - Employee contributions: Up to $23,500 (or $31,000 with catch-up) - Employer profit-sharing contributions: Up to 25% of net self-employment income, with total contributions across both categories capped at $70,000
Key features: - Both traditional (pre-tax) and Roth (after-tax) options are available for employee contributions - Loan provisions are available in most plans - Annual filing with the IRS (Form 5500-EZ) is required once the account balance exceeds $250,000
Best for: Content creators and solopreneurs with consistent, high net self-employment income who want maximum contribution capacity and tax flexibility. If your income is relatively predictable and you’re in a high tax bracket, the Solo 401k offers unmatched contribution room and the ability to choose between pre-tax and Roth treatment based on your current income picture.
The catch: Employee salary deferral contributions (your “employee” portion) must be elected by December 31 of the contribution year. You can’t decide in March that you wanted to defer income from the prior year—which means planning ahead matters.
Tax efficiency in California: For self-employed professionals in Los Angeles, Pasadena, and across California—where state income taxes run up to 13.3%—a Solo 401k’s pre-tax contributions can reduce federal and state taxable income simultaneously. At combined marginal rates that can approach 50% or more, sheltering $70,000 annually represents a potential tax savings of $30,000 or more per year.
Account #2: The SEP IRA (Simplified Employee Pension)
What it is: A retirement savings plan designed for self-employed individuals and small business owners that functions similarly to a traditional IRA but with significantly higher contribution limits.
2026 contribution limits: The same $70,000 overall cap applies as the Solo 401k. However, the SEP IRA contribution is limited to 25% of net self-employment income—which means you need to be earning roughly $280,000 or more in net self-employment income to hit the maximum. There is no employee deferral component—it is employer-contribution only.
Key features: - Contributions can be made up to the tax filing deadline, including extensions (typically October 15 for sole proprietors)—which gives you maximum flexibility to decide how much to contribute once you know your actual annual income - No Roth option—all SEP IRA contributions are pre-tax - No annual filing requirements until you hire full-time employees - Extremely simple to set up and administer
Best for: Content creators and solopreneurs with variable or unpredictable income who want maximum filing flexibility and minimal administrative burden. If you had a great year and want to take full advantage of it after the fact—without having made decisions in December—the SEP IRA is your tool.
The trade-off: The SEP IRA’s simplicity comes with a cost: no Roth option and less overall contribution flexibility compared to the Solo 401k for most income levels. At lower income levels (say, $150,000–$200,000 in net self-employment income), a SEP IRA’s 25% employer contribution rule limits your total contribution to $37,500–$50,000, while a Solo 401k could allow significantly more through the employee deferral component.
Account #3: The Roth IRA
What it is: An individual retirement account where contributions are made with after-tax dollars, and qualified withdrawals in retirement are completely tax-free—including all growth.
2026 contribution limits: $7,500 per year ($8,500 if age 50 or older).
Income phase-out range (2026): - Single filers: Phase-out begins around $150,000, eliminated at $165,000 - Married filing jointly: Phase-out begins around $236,000, eliminated at $246,000
Key features: - Tax-free growth and tax-free qualified withdrawals in retirement - No required minimum distributions (RMDs) during the owner’s lifetime - Contributions (not earnings) can be withdrawn at any time without penalty
Best for: Content creators and solopreneurs who expect their income (and thus tax rates) to remain high in retirement, want tax diversification across different account types, or want tax-free growth on high-potential investments.
The income limitation: Most high-earning solopreneurs earning above ~$165,000 (single) or ~$246,000 (married) cannot contribute directly to a Roth IRA due to income phase-outs. However, a backdoor Roth IRA strategy—contributing to a traditional IRA and then converting it to Roth—can still allow high earners to access Roth treatment. This strategy has its own nuances (particularly the “pro-rata rule” if you have existing pre-tax IRA balances), which is worth discussing with a fiduciary advisor.
How to Stack the Accounts Strategically
For most high-earning solopreneurs, the answer isn’t one account or another—it’s a sequence.
High, consistent income year (e.g., $250,000+ net self-employment income): A Solo 401k typically wins. You can max the employee deferral by December 31, add profit-sharing contributions up to the combined cap, choose Roth or pre-tax treatment based on your tax picture, and still add a backdoor Roth IRA contribution on top.
Variable income year (e.g., you’re not sure what you made until you file): The SEP IRA’s flexibility to contribute up to the October extension deadline makes it more attractive. You can wait until you know your exact income and make the contribution accordingly.
Lower-income transition year (e.g., taking time off, major deductions, or stepping back from a high-revenue year): This may be the ideal time to make Roth conversions from a pre-tax Solo 401k or SEP IRA—paying taxes at a lower rate now and creating tax-free growth for the future.
The most expensive mistake solopreneurs make isn’t failing to contribute—it’s contributing to the wrong account in the wrong year, or prioritizing based on simplicity rather than tax efficiency.
What This Looks Like With a Financial Advisor in Los Angeles
For self-employed professionals in Los Angeles, Pasadena, San Dimas, and across Southern California, retirement account strategy is inseparable from tax planning. California’s high income tax rates mean that the choice between a pre-tax contribution today and a Roth contribution now involves real dollars—not just theoretical tax projections.
At Ryse Financial, we work with solopreneurs, content creators, and self-employed high earners to model contribution scenarios based on current income, projected future income, and long-term tax strategy. We help clients understand not just which accounts to use, but when and in what proportion—so that every dollar saved is doing the maximum amount of work.
Frequently Asked Questions
Can I have both a Solo 401k and a SEP IRA? Generally, you cannot contribute to both a Solo 401k and a SEP IRA for the same business in the same year. However, if you have multiple businesses or income sources, different accounts may apply to different income streams. Consult a tax professional for your specific situation.
Can I open a Solo 401k if I have other full-time employees? No. The Solo 401k is restricted to self-employed individuals with no full-time employees other than a spouse. If you have employees, a different retirement plan structure (such as a traditional 401k with an employer match) would be required.
What is the deadline for opening a Solo 401k? The Solo 401k plan must be established by December 31 of the year for which you want to make employee salary deferral contributions. Employer profit-sharing contributions can be made up to the tax filing deadline.
What happens to my Solo 401k if I get employees? You would need to transition to a different plan structure that covers employees. This is a legitimate consideration for solopreneurs who anticipate growing their team.
Is a backdoor Roth IRA worth the complexity? For most high earners, yes—especially if they have no existing pre-tax IRA balances that would trigger the pro-rata rule. The tax-free growth and the elimination of RMDs from a Roth IRA provide meaningful long-term value, particularly for those who expect to remain in high tax brackets in retirement.
Ryse Financial is a fee-based financial advisory firm serving solopreneurs, content creators, and self-employed professionals in Los Angeles, Pasadena, San Dimas, and across Southern California. This content is for educational purposes only and does not constitute individualized financial, tax, or legal advice.