Self-Employed Retirement Plans: Your Best Options Compared

Rachel spent twelve years climbing the corporate ladder at a management consulting firm — steadily contributing to her 401(k), getting an employer match, watching her balance grow without thinking much about it. Then, at 35, she left to start her own consulting practice. Within eight months she was earning $200,000 a year. Within that same eight months, she'd saved exactly zero dollars in a retirement account.

It wasn't laziness. It was paralysis. Rachel asked three people for advice and got three different answers. Her friend who freelances said, "Just open a SEP IRA — it takes five minutes." A colleague who runs a small agency told her, "Solo 401(k) is way better." And her CPA mentioned something called a defined benefit plan that could shelter $200,000 per year from taxes.

"I spent two months Googling and I was more confused than when I started," Rachel said. "Every article compared two plans. I needed someone to compare all of them and just tell me which one to pick."

So let's do exactly that. Four self-employed retirement plans, side by side, with honest assessments of who each one is actually best for.

The four plans at a glance

Before diving into details, here's the comparison table Rachel wanted from the start:

That table tells most of the story. But the numbers alone don't capture the nuances that matter for real people in real situations. Let's unpack each plan.

Option 1: The Solo 401(k) — best for most self-employed workers

The solo 401(k) is the plan Rachel ultimately chose, and it's the right choice for the majority of self-employed people without employees. The reason is simple: it offers the highest contribution limits at moderate income levels, the most flexibility, and the lowest cost.

At Rachel's income of $200,000, her solo 401(k) allows up to $69,000 in total contributions — $23,500 as an employee deferral plus $45,500 as an employer profit-sharing contribution (roughly 25% of her net self-employment income after the self-employment tax deduction). A SEP IRA at the same income would cap her at $45,500 — no employee deferral allowed.

The Roth option is a significant differentiator. Rachel can direct her $23,500 employee deferral into a Roth sub-account. That money goes in after-tax but grows and comes out completely tax-free. At 35, with potentially 30 years of compounding ahead of her, the Roth component alone could be worth over a million dollars by the time she retires.

The solo 401(k) also avoids the pro-rata trap. Rachel plans to execute a backdoor Roth IRA each year. If she had a SEP IRA, the balance would create a pro-rata issue that makes the backdoor Roth partially taxable. With a solo 401(k), no such problem exists.

Best for: Self-employed individuals with no full-time employees (other than a spouse), earning $50,000 or more, who want maximum contribution flexibility and a Roth option.

The honest downside: If Rachel hires a full-time employee, the solo 401(k) must be terminated or converted to a standard 401(k) — adding thousands in annual compliance costs and nondiscrimination testing. The solo 401(k) only works as long as you stay solo.

Option 2: The SEP IRA — simplicity above all

The SEP IRA (Simplified Employee Pension) is the plan that everyone recommends first because it's the easiest to set up and maintain. Open an account at any major brokerage, contribute up to 25% of net self-employment income, and you're done. No plan documents, no annual filings, no administration.

For a sole proprietor earning $100,000, the SEP IRA limit is $25,000. At $200,000, it's about $45,500. At $300,000 and above, the cap is $69,000 — the same as the solo 401(k)'s maximum.

The SEP IRA's appeal is pure simplicity. You can open one in five minutes, contribute whenever you want before the tax filing deadline, and there's literally zero paperwork beyond the initial account opening. For someone who's overwhelmed by self-employment and just wants to start saving something, the SEP IRA removes every friction point.

But that simplicity comes at a cost. No employee deferral means lower contribution limits at incomes below $300,000. No Roth option means every dollar comes out taxable in retirement. The SEP IRA balance counts in the pro-rata calculation, complicating backdoor Roth strategies. And if you have employees, you must contribute the same percentage for every eligible employee — which can be extremely expensive.

Best for: High-income self-employed individuals ($300,000+) who want the absolute simplest option. Also reasonable as a starting point for new freelancers who plan to switch to a solo 401(k) later.

The honest downside: At incomes below $300,000, you're leaving money on the table compared to a solo 401(k). The lack of a Roth option is an increasingly significant disadvantage as tax-free retirement income becomes more valuable.

Option 3: The SIMPLE IRA — when you have a few employees

The SIMPLE IRA (Savings Incentive Match Plan for Employees) occupies a narrow niche: it's designed for small businesses with up to 100 employees. If you're truly solo, the SIMPLE IRA is almost always inferior to a solo 401(k). It matters primarily for small business owners who've hired a small team.

The contribution limits are the lowest of the four plans: employees can defer up to $16,500 in 2026 (with a $3,500 catch-up for those 50 and older). The employer must either match employee contributions dollar for dollar up to 3% of compensation, or make a flat 2% contribution for all eligible employees.

For Rachel earning $200,000, a SIMPLE IRA would cap her personal contributions at $16,500 in deferrals plus a 3% match on her own compensation ($6,000) — a total of $22,500. Compare that to $69,000 in a solo 401(k). The difference is staggering.

The SIMPLE IRA does have one advantage: mandatory employer contributions are relatively small, making it affordable if you have several employees. A 3% match is far cheaper than the 25%-of-compensation requirement that a SEP IRA imposes on employer contributions to employees.

Best for: Small businesses with 2-10 employees where the owner wants a low-cost plan that satisfies employee benefit requirements.

The honest downside: The contribution limits are painfully low for high earners. There's no Roth option. And the SIMPLE IRA has a nasty penalty twist: withdrawals within the first two years of participation face a 25% early withdrawal penalty (instead of the usual 10%). If you're solo, skip this plan entirely.

Option 4: The defined benefit plan — the high-earner's secret

Now we arrive at the plan Rachel's CPA mentioned — the one that sounded too good to be true. A defined benefit plan is essentially a personal pension. Instead of defining how much you contribute (like a 401(k) or IRA), you define the benefit you'll receive in retirement, and an actuary calculates the annual contribution required to fund that benefit.

The result? Contribution limits that dwarf every other option. Depending on your age and income, a defined benefit plan can allow annual contributions of $200,000 to $300,000 or more. For a 55-year-old surgeon earning $800,000, the annual contribution could exceed $250,000 — all tax-deductible.

The math is simple: the closer you are to retirement age, the more you need to contribute each year to fund the promised benefit. A 55-year-old gets a much larger deduction than a 35-year-old because there are fewer years of growth before the benefit must be paid.

For Rachel, at 35, a defined benefit plan would allow roughly $50,000 to $70,000 in annual contributions — not dramatically more than her solo 401(k). The plan becomes powerful at higher ages and higher incomes. Her CPA was thinking ahead, but the timing wasn't right yet.

Here's the critical difference: a defined benefit plan can be stacked on top of a solo 401(k). Rachel could contribute $69,000 to her solo 401(k) and an additional $50,000+ to a defined benefit plan — potentially sheltering $120,000 or more from taxes. For business owners earning $300,000 and above, this combination is the most tax-efficient retirement savings structure available.

Best for: High-income self-employed professionals ($300,000+) in their 40s, 50s, or 60s who want to maximize tax-deductible retirement contributions and are willing to commit to consistent annual funding.

The honest downside: Complexity and cost. A defined benefit plan requires annual actuarial calculations ($2,000–$5,000 per year), mandatory annual contributions (the actuary's number isn't optional — you must fund it), and IRS compliance filings. If your income drops significantly, you're still obligated to make the required contribution. Terminating the plan early can be complicated. This is not a set-it-and-forget-it strategy.

The decision tree: which plan should you choose?

After researching all four options, Rachel built a decision framework that her advisor confirmed. Here's how to think about it:

Are you solo (no employees except your spouse)? If yes, the solo 401(k) is almost certainly your best option. It offers the highest limits at moderate incomes, a Roth option, no pro-rata issues, and loan access — all for zero annual cost at major brokerages.

Is your income above $300,000 and are you over 40? Consider adding a defined benefit plan on top of your solo 401(k). The combination can shelter $150,000 to $300,000+ per year, creating enormous tax savings at high income levels. Make sure your income is consistent enough to meet the mandatory annual contributions.

Do you have employees? The solo 401(k) is off the table. If you have just a few employees and want simplicity, a SIMPLE IRA is the most affordable option. If you have employees but want higher contribution limits for yourself, consider a standard 401(k) or a SEP IRA (keeping in mind that SEP IRA employer contributions must be the same percentage for all employees).

Do you want the absolute simplest setup? The SEP IRA wins on simplicity. Five minutes to open, zero annual paperwork, contribute by your tax deadline. It's the right choice if you're overwhelmed, just starting out, or earning enough ($300,000+) that the contribution limits match a solo 401(k) anyway.

Are you doing a backdoor Roth IRA? Avoid the SEP IRA. Its balance triggers the pro-rata rule, making your backdoor Roth partially taxable. The solo 401(k) avoids this entirely.

What Rachel chose — and what she's planning

Rachel opened a solo 401(k) at Fidelity in November of her first year of self-employment. She contributed $23,500 as a Roth employee deferral and $45,500 as a pre-tax employer contribution, sheltering $69,000 from taxes. She also executed a clean backdoor Roth IRA for an additional $7,000 — something she couldn't have done tax-efficiently with a SEP IRA.

Her plan for the next five years: continue maxing the solo 401(k) while her business grows. If her income crosses $350,000 consistently, she'll add a defined benefit plan to shelter an additional $80,000 to $100,000 per year. Her CPA estimates the defined benefit plan will cost $3,500 per year in actuarial and administration fees — a small price for $25,000 or more in annual tax savings.

"I wasted two months researching because I couldn't find one article that laid everything out clearly," Rachel says. "The answer for me was obvious once I saw the comparison. Solo 401(k) now, defined benefit later if my income stays high. Everything else was either too limited or too complex for where I am today."

She's right that the choice is usually clearer than the noise suggests. For the vast majority of self-employed workers — freelancers, consultants, contractors, gig workers, and small business owners without employees — the solo 401(k) is the best retirement plan available. It's free, flexible, and lets you save more than any IRA at most income levels. The only question is how soon you can get one set up.

Not sure which self-employed retirement plan fits your business? Talk to a financial advisor who can model your specific income, tax bracket, and growth plans to find the right combination of accounts.