Financial Disclaimer: This article is for informational and educational purposes only. It does not constitute personalized financial, investment, legal, or tax advice. Consult a qualified financial professional before making any financial decisions. Past performance does not guarantee future results.

Self-Employed Retirement Plans: SEP IRA vs Solo 401(k) vs SIMPLE

Self-employed workers and small business owners have access to retirement plans that rival or exceed the contribution limits of traditional employer 401(k) plans. The challenge is choosing the right one. A sole proprietor earning $80,000 can shelter $16,000-$35,750 from taxes depending on the plan chosen. At $200,000 in income, the difference between plans can mean $20,000 or more in annual tax savings.

This guide compares the three most common self-employed retirement plans — SEP IRA, Solo 401(k), and SIMPLE IRA — with 2026 contribution limits, tax treatment, and decision criteria.

Side-by-Side Comparison

Feature	SEP IRA	Solo 401(k)	SIMPLE IRA
Eligibility	Self-employed or small business owner	Self-employed, no employees (except spouse)	Self-employed or business with up to 100 employees
2026 employee deferral	None	$24,500	$17,000
Employer contribution	Up to 25% of compensation	Up to 25% of compensation	3% match or 2% non-elective
Total maximum (under 50)	$72,000	$72,000	~$22,100 (with 3% match on $170K)
Catch-up (50+)	None	$8,000 / $11,250 (60-63)	$4,000 / $5,250 (60-63)
Roth option	No	Yes	Yes (new under SECURE 2.0)
Loan provision	No	Yes	No
Filing requirement	None	Form 5500-EZ if assets exceed $250K	None
Setup deadline	Tax filing deadline (with extensions)	December 31 of the tax year	October 1 of the tax year

Sources: IRS — Retirement Plans for Self-Employed People, IRS — 401(k) Limit Increases for 2026

SEP IRA: Simplest Setup, Highest Employer-Only Contributions

A Simplified Employee Pension IRA allows you to contribute up to 25% of net self-employment income (after the self-employment tax deduction), with a maximum of $72,000 in 2026.

How the self-employed math works: Net self-employment income is reduced by half of self-employment tax, then you can contribute approximately 20% of that adjusted figure (the effective rate after the circular calculation). On $100,000 of Schedule C net profit, you can contribute approximately $18,590.

Net SE Income	Approx SEP Contribution	Tax Savings (24% bracket)
$50,000	~$9,300	~$2,230
$100,000	~$18,590	~$4,460
$200,000	~$37,180	~$8,920
$360,000+	$72,000 (max)	~$17,280

SEP IRA pros:

Simplest to set up and maintain (no annual filing requirement)
Can be opened and funded up to the tax filing deadline (including extensions)
No employee deferral complexity — employer contributes directly
Available at any brokerage with standard IRA custody

SEP IRA cons:

No Roth option — all contributions are pre-tax
No employee deferral means lower total contributions at moderate income levels
No catch-up contributions for those 50+
No loan provision
If you have employees, you must contribute the same percentage for all eligible employees

Source: Fidelity — SEP IRA Contribution Limits

Solo 401(k): Maximum Flexibility and Highest Contributions

The Solo 401(k) — also called an Individual 401(k) — is available to self-employed individuals with no employees other than a spouse. It combines an employee deferral ($24,500 in 2026) with an employer profit-sharing contribution (up to 25% of compensation).

Solo 401(k) contribution structure:

Component	2026 Limit
Employee deferral (under 50)	$24,500
Employee deferral (50-59, 64+)	$32,500
Employee deferral (60-63 super catch-up)	$35,750
Employer profit-sharing	Up to 25% of compensation
Combined maximum (under 50)	$72,000
Combined maximum (50-59, 64+)	$80,000
Combined maximum (60-63)	$83,250

At moderate income levels, the Solo 401(k) significantly outperforms the SEP IRA:

Net SE Income	Solo 401(k) (under 50)	SEP IRA	Difference
$50,000	$33,800	$9,300	+$24,500
$80,000	$39,380	$14,870	+$24,510
$100,000	$43,090	$18,590	+$24,500
$200,000	$61,680	$37,180	+$24,500

The advantage comes from the employee deferral. The SEP IRA has no employee deferral component — you can only contribute as the “employer.” The Solo 401(k) allows you to contribute as both employee and employer.

Source: Fidelity — Solo 401(k) Contribution Limits

Solo 401(k) pros:

Highest possible contributions at any income level
Roth option available for the employee deferral portion
Loan provision (borrow up to 50% of balance, max $50,000)
Catch-up contributions at 50+ and super catch-up at 60-63
Spouse can participate if they earn income from the business

Solo 401(k) cons:

Must be established by December 31 of the tax year (not the filing deadline)
Form 5500-EZ filing required once assets exceed $250,000
Cannot have employees other than a spouse
More complex to set up than a SEP IRA
Some custodians charge annual fees

SIMPLE IRA: For Businesses With Employees

The Savings Incentive Match Plan for Employees is designed for businesses with up to 100 employees. The 2026 employee contribution limit is $17,000, with the employer providing either a dollar-for-dollar match up to 3% of compensation or a 2% non-elective contribution for all eligible employees.

2026 SIMPLE IRA limits:

Component	Standard	Enhanced (SECURE 2.0, eligible employers)
Employee deferral (under 50)	$17,000	$18,100
Catch-up (50-59, 64+)	$4,000	$4,250
Super catch-up (60-63)	$5,250	$5,575
Employer match (up to)	3% of compensation	3% of compensation

Source: IRS — SIMPLE IRA Plan Limits

SIMPLE IRA pros:

Works for businesses with employees (up to 100)
No annual filing requirement
Roth option now available under SECURE 2.0
Lower administrative burden than a traditional 401(k)

SIMPLE IRA cons:

Lower contribution limits than SEP IRA or Solo 401(k)
25% early withdrawal penalty in the first 2 years (instead of standard 10%)
No loan provision
Must be established by October 1 of the tax year
Employer match is mandatory

Decision Framework

Choose a Solo 401(k) if:

You have no employees (or only a spouse)
You want to maximize contributions, especially at income under $200,000
You want a Roth option
You may need to borrow from the plan

Choose a SEP IRA if:

You want the simplest possible setup and administration
You have high income ($200,000+) where the SEP IRA max approaches the Solo 401(k) max
You want to open and fund the plan at tax time (even with extensions)
You do not need Roth contributions or catch-up

Choose a SIMPLE IRA if:

You have employees and want a low-cost, low-complexity plan
Your business does not qualify for a Solo 401(k) due to non-spouse employees
You want to offer a retirement benefit without the compliance burden of a full 401(k)

Combining Plans

You can contribute to both a Solo 401(k) (or SEP IRA) from self-employment income and a separate employer’s 401(k) if you have a W-2 job. However, the employee deferral limit ($24,500) is shared across all 401(k)-type plans. Employer/profit-sharing contributions are calculated separately for each plan.

If you are a freelancer with a side business and a day job: maximize your employer’s 401(k) match, then use a SEP IRA for the side income (employer-only contributions do not count against the $24,500 deferral limit).

Key Takeaways

The Solo 401(k) provides the highest contributions at income below $200,000 due to the employee deferral component — up to $24,500 more than a SEP IRA
The SEP IRA is the simplest to set up and can be opened up to the tax filing deadline
At income above $290,000, SEP IRA and Solo 401(k) contributions converge (both approach $72,000)
The SIMPLE IRA serves businesses with employees but has the lowest limits
Solo 401(k) must be established by December 31; SEP IRA by the filing deadline; SIMPLE IRA by October 1
The Solo 401(k) is the only self-employed plan with Roth, catch-up, and loan features

Next Steps

Read Retirement Planning in Your 30s for the full mid-career strategy
Compare Roth vs Traditional IRA for tax diversification decisions
Return to the retirement planning by decade roadmap

This content is for educational purposes only and does not constitute financial advice. Consult a licensed financial professional for your specific situation.