Most self-employed people I meet have been “meaning to set something up” for retirement for about three years longer than they’re comfortable admitting. No judgment. You’re running a business, wearing twelve hats, and the retirement question keeps getting bumped by whatever’s on fire this week. I get it. But here’s what I tell people when they finally sit down with me: the longer you wait, the more aggressive you’ll have to be later, and aggressive saving is hard when you’ve got a business that still needs capital.

So let’s actually fix this.

Why This Is Harder (and More Flexible) Than a Regular 401(k)

When you worked for someone else, retirement was almost automatic. HR set it up, maybe there was a match, you clicked a box. Now you’re on your own, which is simultaneously the worst and best thing about being self-employed.

The worst part: no match, no auto-enrollment, no nudge. It doesn’t happen unless you make it happen.

The best part: your contribution limits are dramatically higher than what most employees can put away. A W-2 employee maxing out their 401(k) in 2026 can put in $23,500. A self-employed person with the right structure can potentially shelter over $70,000 a year from taxes. That’s not a typo.

You also get to choose the plan that fits your business model instead of accepting whatever your employer picked. That flexibility is worth something.

The Four Plans Worth Knowing

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There are more than four retirement options for self-employed people if you want to get technical, but honestly, most of them aren’t worth your time. Here are the ones I actually recommend, and when each makes sense.

SEP-IRA (Simplified Employee Pension): The easiest to open, the easiest to maintain, and the most forgiving if your income varies year to year. You can contribute up to 25% of net self-employment income, up to a 2026 maximum of $70,000. Zero paperwork beyond the initial setup. You can fund it up to your tax filing deadline (including extensions), so if it’s April and you don’t know what you made yet, you have time. Banks like Fidelity and Vanguard let you open one online in about 20 minutes.

Solo 401(k) (also called Individual 401(k) or i401(k)): More paperwork, more power. This one lets you contribute as both “employee” and “employer,” which means you can shelter a much larger percentage of income at lower earnings levels compared to a SEP-IRA. Also the only self-employed plan that allows a loan provision or a Roth option. The catch: you must open it by December 31 of the tax year you want contributions to count. Miss that deadline and you’re waiting another year.

SIMPLE IRA: Designed for businesses with a handful of employees, not just a solo operator. If you have 1-10 employees and want to offer them something, this is where I’d start. Lower contribution limits than the other two (employee limit is $16,500 in 2026 for those under 50), but administratively simple.

Defined Benefit Plan: Old-school pension math, powered by an actuary. If you’re making serious money late in your career and want to shelter a lot of income fast, this can work. I’ve seen people put away $150,000+ a year in these. But the costs (think $1,500-$3,000 a year in actuarial fees) and the required annual contributions make it appropriate for a narrow slice of people. Not your first move.

Here’s a direct comparison of what matters most:

Plan2026 Max ContributionBest ForRoth OptionKey Deadline
SEP-IRA$70,000Solo/variable incomeNoTax filing + extensions
Solo 401(k)$70,000 (combined)Solo, higher income leverageYesDec 31 to open; April 15 to fund
SIMPLE IRA$16,500 employee + matchSmall teams (1-10 employees)NoOct 1 to establish
Defined Benefit$275,000+ (actuarially set)High earners, late-career catch-upNoDec 31

All figures current as of July 2026. Consult a CPA before choosing, because your specific income structure changes the math.

The Solo 401(k) Math That Surprises Everyone

I’ll be honest: I underestimated the Solo 401(k) for years. I kept defaulting to SEP-IRAs for solo clients because they’re simpler. Then I ran the actual numbers side by side for a client who was netting around $80,000 a year, and I was embarrassed I hadn’t pushed her harder toward the Solo 401(k) sooner.

Here’s why it matters at that income level:

With a SEP-IRA, she could contribute 25% of net SE income (after the SE tax deduction), which worked out to roughly $14,100.

With a Solo 401(k), she could contribute $23,500 as the “employee” contribution, plus about $10,600 as the “employer” contribution, for a total of roughly $34,100. Same income. More than twice the tax shelter.

Worked example 1: Freelance designer, $80K net income, age 41, no employees. SEP-IRA route → $14,100 deductible contribution. Solo 401(k) route → approximately $34,100 deductible contribution. Tax savings difference (assuming 24% federal bracket): roughly $4,800 per year. Over 20 years, with that extra money invested instead of paid in taxes, the gap compounds into something meaningful.

Worked example 2: Consultant, age 58, $220K net income, wants to retire in 8 years. Solo 401(k) with catch-up contributions (extra $7,500 allowed at 55+) → contribution potential near $77,500 for 2026. SEP-IRA → capped at $70,000. Over 8 years, the cumulative difference in tax deferral is material, and the Roth option inside the Solo 401(k) starts making estate planning sense.

Worked example 3: Two-person design studio, both owners plus one part-time employee. The part-time employee works under 1,000 hours a year, which means they don’t have to be included in a SEP-IRA plan (check that threshold carefully with your CPA). Owners set up a SEP-IRA instead of SIMPLE IRA → each owner contributes up to 25% of their respective net SE income, no mandatory employer contribution required for someone not yet eligible.

How to Actually Open One (Because That’s Where People Stall)

The opening is genuinely the hardest part, not because it’s complicated, but because there’s a moment where you have to sit down and fill out forms and it feels like one more administrative thing. Here’s what actually happens when you do it:

For a SEP-IRA, go to Fidelity, Vanguard, or Schwab. Look for “SEP-IRA” in the account opening section. You’ll need your Social Security number or EIN, basic business info, and a funding source. No plan document required (the IRS Form 5305-SEP is the plan). Start to funded account: about 30 minutes, possibly two business days for the transfer to clear.

For a Solo 401(k), it’s a bit more involved. You’ll sign an adoption agreement (Fidelity and Schwab both have them, free). You’ll get a plan document. Once assets hit $250,000, you’ll file IRS Form 5500-EZ annually, which most CPAs can handle in under an hour. One thing people don’t expect: if you want a Roth Solo 401(k) option, not every provider offers it. Fidelity does. Vanguard’s individual 401(k) does not, as of this writing.

The IRS small business tax center has a plain-language comparison of plan types at irs.gov/businesses/small-businesses-self-employed that I refer clients to when they want to do their own reading. It’s surprisingly clear.

What About Investing the Money Once It’s In?

I see people stall here too. They open the account, and then it sits in a money market fund for two years because they couldn’t decide what to invest in.

My honest take: if you’re more than 15 years from retirement and you don’t have strong opinions, a target-date fund pegged to your expected retirement year is a defensible, low-cost choice. Vanguard’s Target Retirement series has expense ratios around 0.08-0.10%. That’s hard to beat. If you want to be more hands-on, a simple three-fund portfolio (US total market, international, bonds) is what most evidence-based financial writing points toward. The Consumer Financial Protection Bureau’s small business resources include some useful general investor education if you want to start there.

For what it’s worth, I use a three-fund approach in my own accounts. Nothing fancy. The boring stuff compounded over time is almost always what wins.

2026 Max Annual Contribution by Plan Type
SEP-IRA$70,000
Solo 401(k)$70,000
Solo 401(k) with catch-up (55+)$77,500
SIMPLE IRA$19,500
Traditional IRA only$7,000
Source: IRS Publication 560 (2026)

Sources

This article is for general informational purposes only and does not constitute financial, tax, or legal advice. Business finance and tax rules vary by entity type, state, and individual circumstances. Consult a qualified CPA, enrolled agent, or business attorney for advice specific to your situation.

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