Solo 401(k) vs SEP IRA for Freelancers: Which Saves More?

Quick Answer

Both solo 401(k)s and SEP IRAs let self-employed people contribute significantly more than traditional IRAs, but solo 401(k)s allow higher total contributions and offer loan provisions, while SEP IRAs are simpler to set up and maintain. Choose a solo 401(k) if you expect higher income and want borrowing flexibility; choose a SEP IRA if you value simplicity and have occasional high-income years.

What's the Contribution Limit Difference?

The biggest advantage of a solo 401(k) is its higher ceiling. For 2026, you can contribute up to $69,000 in a solo 401(k), split between employee deferrals and employer contributions.[1] A SEP IRA caps out at $69,000 as well, but that's typically 20-25% of net self-employment income, meaning you need higher earnings to max it out.[2]

The real difference: with a solo 401(k), you can contribute as an employee (up to $23,500) and as an employer (up to 25% of compensation), giving you more control. With a SEP IRA, the employer contribution is the only option.

Can You Do a Roth Version?

Solo 401(k)s offer a Roth option, letting you contribute after-tax dollars and withdraw tax-free in retirement. SEP IRAs do not offer Roth conversions at all.[3] If you're young and expect future tax brackets to be higher, the Roth solo 401(k) is a significant advantage.

What About Loans?

Solo 401(k)s let you borrow up to 50% of your account balance (max $69,000) and repay it over 5 years.[4] SEP IRAs prohibit loans entirely. If you need emergency access to your retirement savings, a solo 401(k) provides a safety valve.

Which Has Lower Admin Burden?

SEP IRAs win on simplicity. Setup is minimal, paperwork is light, and you can open one anytime before your tax filing deadline. Solo 401(k)s require more documentation, annual Form 5500 filings if assets exceed $250,000, and ongoing compliance.[5] If you hate paperwork, a SEP IRA saves time.

Solo 401(k) Administration Costs

Solo 401(k)s typically cost $200-500 annually to maintain, depending on your provider.[1] SEP IRA fees average $50-100 per year. The trade-off: spend more to get loan access and Roth options.

How Much Income Do You Need to Max Out Each?

To max a SEP IRA at $69,000, you need roughly $276,000-$345,000 in net self-employment income.[2] A solo 401(k) requires less: you can hit $69,000 total with around $115,000-$150,000 in earnings because you combine employee deferrals and employer contributions.

Variable Income Years: Which Flexes Better?

SEP IRAs force you to contribute the same percentage of income every year, which can be punishing in high-income years but painless in slow years. Solo 401(k)s let you vary contributions annually—if you have a great year, maximize contributions; if it's slow, contribute minimally.[3]

Tax Deduction: Both Are Immediate

Both plans give you a full tax deduction for contributions in the year made. A solo 401(k) contribution of $50,000 reduces taxable income by $50,000 in 2026.

Investment Control

Solo 401(k)s typically offer broader investment options: stocks, bonds, mutual funds, ETFs, and even self-directed investments like real estate or private equity (with proper custodians).[4] SEP IRAs have more limited menus, though most providers offer standard stocks and funds.

Spousal Income Considerations

Both solo 401(k)s and SEP IRAs let you contribute based on your spouse's self-employment income if you file jointly. A married couple with a joint business can use either plan and multiply contribution limits.

Recommended Calculators

• Freelance Rate Calculator — Estimate quarterly earnings and max retirement contributions
• Self-Employment Tax Calculator — Calculate net income for contribution limits
• Retirement Calculator — Project portfolio growth and retirement readiness
• Gig Retirement Planner — Compare solo 401(k) vs SEP IRA projections side-by-side

Frequently Asked Questions

Can I have both a solo 401(k) and a SEP IRA? No. You must choose one and stick with it for the year. However, you can switch plans annually if your business circumstances change.

What if I have W-2 income and freelance income? You can contribute to an employer 401(k) through your W-2 job separately. For your freelance income, choose either a solo 401(k) or SEP IRA. Just watch aggregate deferral limits across plans.

Can I set up a solo 401(k) if I have employees? No. A true solo 401(k) is only for self-employed people with no employees. If you hire a W-2 employee, you must cover them in the plan, which changes the rules significantly.

Which plan do most freelancers choose? Solo 401(k)s are more popular among high-income freelancers (>$150K/year) who want Roth options and loan flexibility. SEP IRAs dominate for low-to-moderate income freelancers who prioritize simplicity.

Sources

[1] Internal Revenue Service. (2026). "401(k) contribution limits." https://www.irs.gov/retirement-plans/plan-participant-employee/401k-plans

[2] Internal Revenue Service. (2026). "SEP IRA contributions for 2026." https://www.irs.gov/retirement-plans/sep-ira-contribution-limits

[3] Internal Revenue Service. (2026). "Roth 401(k) vs SEP IRA." https://www.irs.gov/retirement-plans/roth-comparison

[4] Internal Revenue Service. (2026). "Loans from your 401(k) plan." https://www.irs.gov/retirement-plans/plan-participant-employee/loans-from-your-401k-plan

[5] Internal Revenue Service. (2026). "Form 5500 filing requirements." https://www.irs.gov/retirement-plans/form-5500-series-downloads