Self-Employed Retirement Plans 2026: SEP-IRA vs Solo 401k vs SIMPLE IRA

For self-employed workers, a retirement plan is simultaneously a savings vehicle and a tax deduction. Choosing the right plan — and contributing the maximum — can eliminate tens of thousands of dollars in income tax annually while building long-term wealth.

The Three Main Self-Employed Retirement Plans

Feature	SEP-IRA	Solo 401(k)	SIMPLE IRA
2026 contribution limit	$70,000	$70,000 ($77,500 with catch-up)	$16,500 ($20,000 if 50+)
Employee deferral component	No	Yes — $23,500	Yes — $16,500
Employer contribution	25% of net SE income	25% of net SE income	3% match or 2% non-elective
Roth option	No	Yes (Roth Solo 401k)	No
Allows loans	No	Yes (up to $50,000 or 50% of balance)	No
Employees covered	Must cover all eligible employees	Owner and spouse only	Must cover all eligible employees
Annual IRS filing	None required	Form 5500-EZ when assets > $250,000	None required
Deadline to establish	Tax filing deadline + extension	December 31 of plan year	October 1 for new SIMPLE plans
Administrative complexity	Very low	Low to moderate	Low

SEP-IRA: Best for Simplicity

A SEP-IRA (Simplified Employee Pension) is the easiest self-employed retirement plan to set up and maintain. Open at any major brokerage (Fidelity, Vanguard, Schwab) in minutes. No annual reporting to the IRS until the plan is terminated.

How the Contribution Limit Works

Net SE earnings = Net business profit − deductible half of SE tax

Maximum SEP-IRA contribution = Net SE earnings × 20% (which equals 25% of net SE earnings after the SE deduction reduction)

The IRS calculation adjusts the 25% rate because the denominator (compensation) is self-referential. The effective contribution rate on net profit is approximately 20%.

Net Business Profit	SE Tax Deduction	Net SE Earnings	Max SEP Contribution (20%)
$50,000	$3,532	$46,468	$9,294
$100,000	$7,065	$92,935	$18,587
$150,000	$10,597	$139,403	$27,881
$200,000	$14,130	$185,870	$37,174
$350,000+	(SS cap applies)	~$280,000+	$70,000 (capped)

Employer contributions only: Unlike the Solo 401(k), you cannot make employee-type salary deferrals. All contributions are employer contributions.

Deadline: You can open a SEP-IRA and fund it up until your tax return due date including extensions (October 15 for most self-employed filers).

Key drawback: If you have employees, you must contribute the same percentage of compensation for all eligible employees as you contribute for yourself. A 20% SEP contribution rate means 20% for every eligible employee too — this makes SEP-IRAs expensive once you have staff.

Solo 401(k): Best for Maximizing Contributions

The Solo 401(k), also called an Individual 401(k) or Self-Employed 401(k), is structured like a corporate 401(k) but for a business with no full-time employees other than the owner (and optionally the owner’s spouse).

Two Contribution Components

Component 1 — Employee Deferral:

• Up to $23,500 in 2026 ($31,000 if age 50+)
• Not limited to a percentage of income
• Must have earned at least the contribution amount from the business

Component 2 — Employer Profit-Sharing:

• Up to 25% of net SE earnings (same calculation as SEP-IRA)
• Combined with employee deferral, cannot exceed $70,000 total

Why Solo 401(k) Wins at Lower Income Levels

At $50,000 net business profit, the SEP-IRA limits you to ~$9,300. The Solo 401(k) lets you contribute $23,500 in employee deferrals plus ~$9,300 employer contribution = $32,800 total — 3.5x more.

Net Business Profit	SEP-IRA Max	Solo 401(k) Max
$30,000	$5,600	$29,200
$50,000	$9,300	$32,800
$80,000	$15,100	$38,600
$100,000	$18,600	$42,100
$150,000	$27,900	$51,400
$200,000+	$37,200	$60,700
$350,000+	$70,000 (cap)	$70,000 (cap)

Roth Solo 401(k): Unlike a SEP-IRA, many Solo 401(k) providers offer a Roth designation for the employee deferral portion. Roth contributions are after-tax but grow and are withdrawn tax-free — powerful for younger earners expecting higher future tax rates.

Deadline: The Solo 401(k) plan must be established by December 31 of the tax year (unlike SEP-IRA which can be opened until the filing deadline). Contributions can continue until the filing deadline.

SIMPLE IRA: Best if You Have Employees

The SIMPLE IRA (Savings Incentive Match Plan for Employees) is designed for small businesses with employees. It is simpler to administer than a full 401(k) plan while still covering all eligible employees.

2026 SIMPLE IRA Limits

Contribution Type	2026 Limit
Employee deferral	$16,500
Employee deferral if 50+	$20,000
Employee deferral if 60–63	$23,500 (enhanced catch-up, SECURE 2.0)
Employer match	3% of employee compensation
OR employer non-elective	2% of compensation for all eligible employees

Key restriction: Once you establish a SIMPLE IRA, you generally cannot maintain any other retirement plan for the same business in the same year. This is the main reason Solo 401(k) or SEP-IRA may be preferable for owner-only businesses.

Tax Deduction Impact: How Much Income Tax Do You Save?

All three plans produce the same type of tax benefit: an above-the-line deduction that reduces your AGI and federal/state income tax. None reduce your self-employment tax.

Example: $100,000 net business profit, 22% federal bracket, 5% state tax

Plan	Max Contribution	Tax Savings (22% + 5%)
SEP-IRA	$18,587	~$5,021
Solo 401(k)	$42,100	~$11,367
SIMPLE IRA	$16,500	~$4,455

The Solo 401(k) produces more than twice the tax savings of the other options at this income level.

Which Plan Should You Choose?

Your Situation	Best Plan
Just starting, want simplicity	SEP-IRA
Income under $200,000, want maximum deduction	Solo 401(k)
Income over $350,000	Either SEP-IRA or Solo 401(k) (both cap at $70,000)
Want Roth option within plan	Solo 401(k)
Have 1–10 employees	SIMPLE IRA
Over age 50, want catch-up contributions	Solo 401(k) (largest catch-up allowance)

Use the paycheck calculator to estimate your self-employment income, then reference the Solo 401(k) vs SEP-IRA comparison table above to identify your maximum possible deduction.

What is the maximum SEP-IRA contribution for 2026?

For 2026, you can contribute up to 25% of your net self-employment income (after the SE tax deduction), with a maximum of $70,000. Net SE income for this purpose means your business profit minus the deductible half of self-employment tax. For example, $200,000 in net SE income allows approximately $37,170 in SEP-IRA contributions (25% of net earnings after SE tax deduction).

What is the Solo 401(k) contribution limit for 2026?

The Solo 401(k) has two components: an employee contribution of up to $23,500 (plus $7,500 catch-up if 50+), and an employer profit-sharing contribution of up to 25% of net SE income. The combined limit is $70,000 (or $77,500 with catch-up). The Solo 401(k) can reach higher total contributions than a SEP-IRA at income levels below $200,000 because the employee deferral component is not percentage-based.

Which retirement plan is best for self-employed workers?

For simplicity and any income level: SEP-IRA (easy to open, no annual filing required). For maximizing contributions at income below $200,000: Solo 401(k) wins because the employee contribution component lets you shelter more at lower income. For those with employees: SIMPLE IRA is designed to cover employees cost-effectively. For income above $200,000: SEP-IRA and Solo 401(k) both reach the $70,000 maximum; choose based on Roth option preference and administrative tolerance.

Does a SEP-IRA or Solo 401(k) reduce self-employment tax?

Neither directly reduces your self-employment tax (SE tax is calculated before retirement contributions). However, both reduce your adjusted gross income (AGI), which lowers your federal and state income tax. The retirement contribution deduction is an above-the-line deduction on Schedule 1 of Form 1040 — it reduces your income tax but not the SE tax base.

Can I have both a Solo 401(k) and a SEP-IRA?

Generally you cannot contribute to both a SEP-IRA and a Solo 401(k) for the same business in the same year — the IRS considers them competing plan types and combined employer contributions cannot exceed the annual limit. However, if you have self-employment income from multiple, unrelated businesses, more complex strategies may be available. Consult a tax professional before contributing to both.