For a self-employed person choosing between a SEP IRA and solo 401(k), which account type and provider make the most sense this year?

For most self-employed people in 2026, a solo 401(k) is the more flexible choice, while a SEP IRA wins mainly for simplicity.

The key difference

The IRS confirms the 2026 401(k) employee-deferral limit is $24,500 and the overall defined-contribution limit is $72,000; the SEP maximum is also $72,000.IRS+1

The important wrinkle for a self-employed person is that the employer contribution isn't simply 25% of Schedule C profit. You have to adjust for the deductible portion of self-employment tax and your own contribution.IRS

When I'd lean toward each

Solo 401(k): If you're the only worker (or your spouse works in the business), have reasonably strong self-employment income, and want to save a substantial amount. You get the employee deferral in addition to the employer contribution, which can let you reach the annual maximum at a lower income than with a SEP. You can also potentially use Roth contributions and catch-ups.IRS+1

SEP IRA: If you want the absolute simplest arrangement, don't care about employee salary deferrals/Roth 401(k) contributions, or expect to add employees. One major consideration is that if you have eligible employees, SEP contributions generally have to be made for them at the same percentage as for yourself.Fidelity+1

Provider: Fidelity is a strong default

For a one-person business, Fidelity's Self-Employed 401(k) is a particularly straightforward option. Fidelity currently advertises no account fees or minimums, a $72,000 2026 contribution ceiling before catch-ups, and both traditional and Roth contribution capability.Fidelity+1

fidelity.com

For a SEP, Fidelity is likewise inexpensive and simple, with no account fees/minimums and broad investment choices.Fidelity

fidelity.com

Schwab is another reasonable choice, particularly if you already use Schwab; its SEP IRA has no opening or maintenance fee.Schwab Brokerage

One important 2026 issue

If you're age 50+, the solo 401(k) becomes more compelling because of catch-up contributions. For 2026 the standard catch-up is $8,000, while the special SECURE 2.0 catch-up for ages 60–63 is $11,250.IRS

If you tell me (1) your approximate 2026 net self-employment income, (2) your age, (3) whether you have employees, and (4) whether you also have a W-2 job with a 401(k), I can calculate the approximate maximum contribution under each and show which structure produces the larger tax-advantaged contribution.

For most self-employed people in 2026, a Solo 401(k) is the more flexible choice; a SEP IRA makes more sense when simplicity is the priority or when you have employees.

Solo 401(k) vs. SEP IRA

The IRS confirms that a one-participant 401(k) lets the owner contribute in both the employee and employer capacities, while a SEP only permits employer contributions.IRS+1

The especially important distinction is that the $24,500 employee deferral can let a Solo 401(k) reach substantial contributions even when your self-employment income isn't high enough for a SEP's percentage-based contribution to do so.IRS+1

Provider

If I were narrowing the provider choices in 2026, I'd look first at Fidelity for a Solo 401(k). Fidelity currently advertises its Self-Employed 401(k) with no account fees, a broad brokerage investment menu, and both traditional and Roth contribution capabilities.Fidelity

fidelity.com

Charles Schwab is another reasonable low-cost alternative, particularly if you already use Schwab. Its brokerage accounts have no opening or maintenance fees, although investment-specific fees can apply.Schwab Brokerage

schwab.com

For a SEP IRA, Fidelity, Schwab, and Vanguard/Ascensus are all worth considering; the tax rules are essentially the same, so investment choices, fees, and convenience become the differentiators. Vanguard currently lists the 2026 SEP maximum as $72,000.Vanguard

My practical rule of thumb

• Solo business, no employees + you want to maximize contributions: Solo 401(k).
• Solo business + you want Roth contributions: Solo 401(k), assuming the chosen plan supports them.
• You are 50+ and want catch-up contributions: Solo 401(k).
• Highly variable income and you want an extremely simple plan: SEP IRA can be attractive.
• You expect to hire employees soon: pause before choosing; the employee implications can substantially change the analysis.
• Provider: Fidelity is a particularly straightforward default for a Solo 401(k); Schwab is a good alternative.

One important wrinkle: your business structure and income matter a lot. The actual contribution calculation differs between a sole proprietorship/1099 business, an LLC, and an S corporation.

If you give me (1) approximate 2026 net self-employment income, (2) age, (3) sole prop/LLC/S-corp, and (4) whether you have employees, I can calculate the approximate maximum contribution under each and show which structure gives you more tax-advantaged savings.

Provider

If I were narrowing the provider choices in 2026, I'd look first at Fidelity for a Solo 401(k). Fidelity currently advertises its Self-Employed 401(k) with no account fees, a broad brokerage investment menu, and both traditional and Roth contribution capabilities.Fidelity

fidelity.com

Charles Schwab is another reasonable low-cost alternative, particularly if you already use Schwab. Its brokerage accounts have no opening or maintenance fees, although investment-specific fees can apply.schwab.com

Choosing between a SEP IRA and a Solo 401(k) (Individual 401(k)) comes down to how much you want to maximize your contributions, whether you need a Roth option or loans, and how much paperwork you are willing to handle.employeefiduciary.com+1

Account Type Comparison: Which Makes Sense?

• Solo 401(k): The Winner for Higher Contribution Potential & Flexibility
  • Contributions: You contribute as both the employee (elective deferral up to standard limits) and the employer (up to 25% of net earnings from self-employment). This lets you stash away a massive amount on a modest income compared to a SEP IRA.
  • Catch-Up Contributions: Highly advantageous if you are older. Under SECURE 2.0 rules, catch-up contributions for ages 50–59 (and 64+) are an extra $8,000, while ages 60–63 get an enhanced limit of $11,250. SEP IRAs do not allow catch-up contributions.
  • Roth Options: Many major brokerages support Roth Solo 401(k) contributions (allowing after-tax contributions that grow and withdraw tax-free).
  • Loans: Solo 401(k) plans often allow you to borrow up to 50% of your balance (max $50,000). SEP IRAs do not permit loans.
  • The Catch: Slightly more complex setup and requires filing IRS Form 5500-EZ once total plan assets exceed $250,000.udirectira.com+2
• SEP IRA: The Winner for Simplicity
  • Contributions: Limited to employer-only contributions (up to 25% of net earnings from self-employment). If your net business income is lower, you might not notice a difference, but at higher income levels, you can contribute less total money than a Solo 401(k).
  • No Employee Deferrals: You cannot make employee-style salary deferrals.
  • The Upside: Extremely easy to open, zero annual IRS reporting paperwork, and simple administration.udirectira.com

Verdict: If you have no employees (other than a spouse) and want the highest possible contribution ceiling, the Solo 401(k) is almost always the superior choice.employeefiduciary.com+1

Top Providers This Year

If you decide to go with a Solo 401(k) , major traditional brokerages offer robust, low-fee plans:

1. • Fidelity Investments: Rated as the best overall provider. Fidelity offers a Solo 401(k) with $0 setup and annual maintenance fees, plus Roth contribution support. (Note: They generally do not permit participant loans). Check it out via Fidelity Investments.forusall.com+2
2. • Charles Schwab: Excellent choice if you want zero-fee basic transactions and a wide array of low-cost index funds and ETFs. Explore details on the Charles Schwab Website.investopedia.com+1
3. • E*TRADE: Best for feature-rich management and robust digital tools for independent investors. Review offerings at E*TRADE.

If you opt for the simplicity of a SEP IRA , providers like Fidelity, Schwab , and Vanguard all offer straightforward, fee-free setups.

To help narrow down the exact right fit, tell me:

• What is your estimated net self-employment income for this year?
• Do you want to invest in traditional stocks/funds or alternative assets like real estate?

For most self-employed people in 2026, a Solo 401(k) is usually the better choice, but a SEP IRA can still make sense for simplicity. The “best” provider is usually the one with low/no fees, good index funds or ETFs, and features you actually need (Roth, loans, after-tax contributions, etc.).IRS+1

Quick recommendation

Choose a Solo 401(k) if you:

• Have no employees other than a spouse
• Want to maximize retirement savings
• Have moderate-to-high self-employment income
• Want a Roth option
• Want the ability to make employee deferrals even in lower-income years

A Solo 401(k) lets you contribute as both employee and employer. For 2026, the employee deferral limit is $24,500 (plus catch-up contributions if eligible), and total contributions can reach $72,000 before catch-ups, subject to the rules.IRS+1

Choose a SEP IRA if you:

• Want the simplest possible setup
• Don’t care about Roth contributions
• Prefer a traditional IRA-style account
• Have inconsistent income and mostly want employer contributions

A SEP IRA is simpler administratively, but it only allows employer contributions—no employee salary deferral. The 2026 SEP limit is generally the lesser of 25% of compensation or $72,000.IRS

Provider choices I’d look at

Best overall: Fidelity Investments Solo 401(k)

Why:

• No account fees
• Strong low-cost index fund lineup
• Good customer service reputation
• Roth Solo 401(k) availability
• Good fit for a “set it and forget it” investor

Best for DIY investors: Charles Schwab Corporation Solo 401(k)

Why:

• No maintenance fees
• Excellent ETF access
• Good for people who prefer managing their own portfolio

Best if you want a very polished retirement-plan platform: Vanguard

Why:

• Excellent low-cost funds
• Strong retirement focus
• Particularly attractive if you already use Vanguard funds

SEP IRA alternatives

If you choose a SEP IRA, Fidelity, Schwab, and Vanguard are also common choices because the accounts are straightforward and inexpensive.

My default picks by situation

A few questions would change the answer:

1. Is this your only business income, or do you also have a W-2 job with a 401(k)?
2. Roughly what is your net self-employment income (e.g., $30k, $100k, $300k+)?
3. Are you under or over age 50?
4. Do you want Roth contributions?

With those details, the best choice can be narrowed down quite a bit.

Choosing between a SEP IRA and a Solo 401(k) (Individual 401(k)) comes down to how much you want to contribute, whether you want Roth options, and if you plan to hire employees down the road. For most solo entrepreneurs with no W-2 employees (other than a spouse), the Solo 401(k) wins , but a SEP IRA still holds an edge for sheer administrative simplicity.

Part 1: SEP IRA vs. Solo 401(k) — Which Account Type Makes Sense?

Solo 401(k)

• Best for: Maximizing contributions at lower income levels, wanting Roth (after-tax) flexibility, or needing a loan feature.investopedia.com+1
• How contributions work: You contribute in two roles—as the employee (elective deferrals up to the annual limit) and as the employer (nonelective contributions up to a percentage of net earnings).
• Key Advantages:
  • Higher contribution limits at lower income: Allows you to sock away more money when your net self-employment income is modest, because of the employee deferral component.
  • Roth contributions: Many top providers now support Roth Solo 401(k) contributions, allowing for tax-free growth and withdrawals.
  • Loan feature: Some providers allow you to borrow against your Solo 401(k) (up to 50% of the balance or $50,000, whichever is less).investopedia.com+1
• Key Drawbacks: Requires slightly more paperwork to set up (including getting an EIN for the plan) and annual IRS Form 5500-EZ filing once your total plan assets cross $250,000.

SEP IRA

• Best for: Ultra-fast setup, absolute minimal paperwork, or if you already have/plan to hire W-2 employees and want a uniform contribution system.
• How contributions work: Contributions are strictly employer-funded (up to ~20% of net adjusted self-employment earnings).
• Key Advantages:
  • Dead simple: Incredibly easy to open and maintain with virtually zero ongoing compliance paperwork.
  • High ceiling for high earners: If you have high net self-employment income, the percentage-based employer contribution can match or approach total limits without needing employee deferral math.
• Key Drawbacks: No employee catch-up contributions, no Roth options (all contributions are pre-tax), no borrowing/loans, and if you hire employees , you must make equal percentage contributions for them, which can become very expensive.

Part 2: Top Providers for This Year

If you want standard brokerage investing (mutual funds, ETFs, stocks) with $0 setup and maintenance fees , the major mainstream brokerages are your best bet:

1. Fidelity Investments
   • Best Overall for Both: Rated top tier by Investopedia's Best Solo 401(k) Companies and Finder's Best SEP IRA.
   • Offering: Excellent, zero-fee SEP IRAs and robust Solo 401(k) platforms featuring $0 online trade commissions and great research tools. Note that Fidelity’s standard Solo 401(k) supports traditional pre-tax funds and doesn't permit plan loans.finder.com+3
2. Charles Schwab
   • Best for Low-Cost/Value: Outstanding customer service, vast investment selection, and $0 recurring fees for both SEP IRAs and Solo 401(k) plans.

To help narrow down the ideal path for your business, tell me:

• Do you have any current or planned W-2 employees?
• Are you aiming for pre-tax (traditional) or Roth savings?
• Roughly what is your projected net self-employment income this year?

For 2026, if you’re genuinely self-employed with no employees other than possibly your spouse, I’d generally choose a solo 401(k) over a SEP IRA—and Fidelity would be my default provider.

Why the solo 401(k) usually wins

The big advantage is that the solo 401(k) lets you contribute as both employee and employer. The employee piece can be $24,500 in 2026, on top of the employer contribution. The IRS confirms the 2026 401(k) deferral limit is $24,500 and the overall defined-contribution limit is $72,000.IRS+1

A SEP IRA, by contrast, is essentially employer contribution only; salary deferrals and catch-up contributions aren't permitted. Its 2026 limit is the lesser of $72,000 or 25% of compensation (with special calculation rules for self-employed people).IRS+1

When I'd pick each

Pick a solo 401(k) if:

• Your business profit is moderate rather than extremely high.
• You want to maximize retirement contributions.
• You want a Roth option.
• You're age 50+.
• You might want a 401(k) loan.
• You want to preserve the possibility of doing a backdoor Roth IRA without creating a large traditional-IRA balance.

Pick a SEP IRA if:

• Your priority is absolute simplicity.
• You have a business with employees and don't want a 401(k) arrangement.
• Your income is high enough that the SEP's employer-only contribution gets you where you want to be anyway.
• You may want to establish the plan/contribution relatively late in the tax-filing process. SEP contributions generally can be made by the business tax-return deadline, including extensions.Fidelity

One important employee consideration: a SEP generally requires you to contribute the same percentage of compensation for eligible employees as you contribute for yourself. That can make a SEP expensive once you have employees.Fidelity+1

My provider pick: Fidelity

I'd lean toward Fidelity Investments for most solo business owners.

Fidelity's self-employed 401(k) currently has no account fees, supports traditional and Roth contributions, and is designed specifically for owner-only businesses (plus a spouse).Fidelity+1

Its 2026 self-employed 401(k) materials show:

• $24,500 employee deferral
• $72,000 total contribution limit before catch-up
• $8,000 age-50+ catch-up
• $11,250 age-60–63 catch-up
• Roth contributions availableFidelity

That's a particularly good combination of low cost + broad investment choices + Roth capability + straightforward administration.

fidelity.com

Schwab is also an excellent alternative, particularly if you already have accounts there. Vanguard is attractive if you strongly prefer Vanguard's investment ecosystem, although its current SEP offering doesn't provide Roth contributions.Schwab Brokerage+1

One caveat that could completely change the answer

Your business structure and profit level matter a lot. For example, a sole proprietor earning $40,000 versus an S-corp owner paying themselves $100,000 in W-2 wages can have very different optimal contribution strategies.

If you give me (1) your approximate 2026 business profit, (2) whether you're a sole proprietor/LLC/S-corp, (3) your age, and (4) whether you have any employees, I can calculate the actual 2026 maximum contribution under each option and tell you which one is likely to save you more in taxes.

Choosing between a SEP IRA and a Solo 401(k) (Individual 401(k)) comes down to your income level, whether you want Roth options, and if you have (or plan to hire) employees.

Which Account Type Makes the Most Sense?

• Solo 401(k) Wins If: You want to maximize your savings at lower income levels, want the option to make Roth contributions (after-tax contributions that grow tax-free), or want to borrow against your retirement via a loan feature.
  • Why: As a Solo 401(k) owner, you act as both employer and employee. You can contribute as the "employee" up to the elective deferral limit ($23,500, plus an extra $7,500 catch-up if you're 50+) plus an additional 20% to 25% of your net self-employment earnings as the "employer," up to overall IRS caps.
• SEP IRA Wins If: You want absolute simplicity in setup and administration, or you have high and volatile income where you only want to contribute during great years without worrying about employee-side limits.
  • Why: Contributions are strictly employer-funded (up to 20% to 25% of net adjusted self-employment earnings). There is zero paperwork to file with the IRS annually until the account hits very high balances (typically $250,000+, requiring a Form 5500-SF—though Solo 401(k)s face this threshold too).
• The Catch: If you have W-2 employees working for your business (other than a spouse), you cannot use a Solo 401(k). A SEP IRA allows employees, but remember that if you contribute a percentage of your own income to a SEP IRA, you must contribute that exact same percentage to your eligible employees' accounts, which can get expensive.

Top Providers This Year

For self-employed investors looking for low or zero-fee options with robust fund choices, industry analysts and ratings consistently highlight these top platforms:

• Fidelity Investments : Rated as the best overall provider for both Fidelity Solo 401(k) and SEP IRAs. Offers zero account fees, zero commission online trades for stocks and ETFs, and a massive selection of low-cost index funds.finder.com+2
• Charles Schwab : Highly recommended for low-fee transactions and self-employed individuals, providing great customer service and robust educational tools with no baseline maintenance fees.investopedia.com+2
• E*TRADE : Excellent if you want advanced account features, strong trading platforms, and seamless handling of both traditional and Roth Solo 401(k) tiers.investopedia.com+1

To help narrow down which choice fits your business best, let me know:

• Do you have any employees (other than yourself or a spouse)?
• Are you interested in Roth (after-tax) contributions?
• Roughly what is your annual self-employment net income?