SEP IRA vs. Solo 401(k): Which Retirement Account Should Self-Employed People Use?

SEP IRA vs. Solo 401(k): Which Retirement Account Should Self-Employed People Use?

If you're self-employed, a freelancer, or run a small business with no employees, you don't get access to an employer 401(k) — but you have two powerful alternatives that can let you save far more than a regular IRA allows. Here's how a SEP IRA and a Solo 401(k) actually compare, and which one usually wins.

Why Self-Employed People Need a Different Account

A regular IRA caps you at $7,000 a year (2026 limit) — nowhere near enough for someone who wants to save aggressively and also gets a much larger tax deduction opportunity as a business owner. SEP IRAs and Solo 401(k)s exist specifically to let self-employed people and small business owners contribute far more, sheltering significantly more income from taxes each year.

What Is a SEP IRA?

A SEP (Simplified Employee Pension) IRA lets a self-employed person or small business contribute up to 25% of net self-employment income, up to a maximum of $70,000 for 2026. Contributions are made entirely by the "employer" side — even if that's just you — and are tax-deductible.

SEP IRAs are simple to set up and maintain: minimal paperwork, no annual filing requirement with the IRS in most cases, and most brokerages let you open one in under 15 minutes.

What Is a Solo 401(k)?

A Solo 401(k) (also called an Individual 401(k)) is a 401(k) plan designed for a business owner with no full-time employees other than a spouse. It lets you contribute in two ways:

  • As the "employee": up to $23,500 in 2026 (or $31,000 if 50+), the same limit as a regular 401(k)
  • As the "employer": up to 25% of net self-employment income

Combined, the total contribution limit is $70,000 for 2026 ($77,500 if 50+), the same overall cap as a SEP IRA — but the path to get there is very different.

The Key Difference: How Fast You Hit the Max

This is where Solo 401(k)s usually win for lower and moderate earners. Because the Solo 401(k) lets you contribute as both "employee" and "employer," you can often max out your contribution at a much lower income level than a SEP IRA would allow.

Net Self-Employment Income Max SEP IRA Contribution Max Solo 401(k) Contribution
$50,000~$9,300~$32,800
$100,000~$18,600~$42,100
$200,000+Up to $70,000Up to $70,000

At lower incomes, the Solo 401(k)'s employee contribution (which isn't tied to a percentage of income the same way) lets you shelter far more. At high enough income, both accounts converge on the same $70,000 cap.

Other Differences Worth Knowing

SEP IRA Solo 401(k)
Roth optionNoYes, for the employee portion
Loan optionNoYes, up to $50,000 or 50% of balance
Setup complexityVery simpleSlightly more paperwork
Annual IRS filingGenerally noneForm 5500-EZ required once assets exceed $250,000
EmployeesMust cover eligible employees equally (% of pay)Only works with no employees (except a spouse)

The Roth Advantage of a Solo 401(k)

A meaningful edge for the Solo 401(k): the employee portion can be contributed as Roth, meaning you pay tax now and get tax-free growth and withdrawals later — something a SEP IRA doesn't offer at all. If you value having both pre-tax and tax-free retirement savings (see our guide on Roth IRAs), only the Solo 401(k) gives you that flexibility within the account itself.

When a SEP IRA Makes More Sense

  • You want the absolute simplest setup with minimal ongoing administration
  • You have a small number of employees you're willing to also contribute for (SEP IRAs require proportional contributions to eligible employees)
  • Your income is already high enough that both accounts hit the same $70,000 cap anyway
  • You don't need a Roth option or a loan feature

When a Solo 401(k) Makes More Sense

  • Your net self-employment income is moderate (roughly under $150,000) and you want to shelter as much as possible
  • You want a Roth savings option
  • You might want to borrow against your retirement savings in an emergency
  • You have no employees other than possibly a spouse

A Simple Example

Maria is a freelance consultant earning $90,000 in net self-employment income. With a SEP IRA, her maximum contribution is about 20% of net earnings after adjustments — roughly $16,700. With a Solo 401(k), she can contribute $23,500 as the "employee" plus roughly 20% of net earnings as the "employer" — around $16,700 — for a combined total near $40,200. Same income, more than double the tax-advantaged savings, simply by choosing the Solo 401(k) structure.

How to Open Either Account

Both are available through most major brokerages (Fidelity, Schwab, Vanguard) at no cost to open. A SEP IRA can typically be opened online in one sitting. A Solo 401(k) usually requires a short plan adoption agreement — still a same-day process at most brokerages, just slightly more paperwork upfront.

Curious how your retirement contributions could grow over time, regardless of which account you choose?

đź“Š 401(k) Calculator

Project how your contributions could grow over time — the same math applies whether it's a Solo 401(k) or a traditional one.

Try the 401(k) Calculator →

Common Mistakes to Avoid

  • Assuming a SEP IRA always lets you contribute more — at moderate incomes, the Solo 401(k) usually allows a significantly higher contribution.
  • Opening a Solo 401(k) after hiring employees — the plan becomes invalid once you have non-spouse employees; a SEP IRA or a different small business plan is needed instead.
  • Missing the Form 5500-EZ filing — required once your Solo 401(k) balance exceeds $250,000; a missed filing can trigger penalties.
  • Not accounting for the self-employment tax adjustment — the 25% limit is calculated on net earnings after subtracting half of your self-employment tax, not your gross income.
  • Overlooking the Roth option — many people default to pre-tax contributions without considering whether Roth would serve them better long-term.

Bottom Line

For most self-employed people without employees, the Solo 401(k) is the stronger default — it usually allows higher contributions at the same income level, offers a Roth option, and even allows loans in a pinch. The SEP IRA remains the better choice mainly when simplicity is the top priority or when a business has employees who need to be included. Either way, both dramatically outpace what a regular IRA alone can offer.

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