Both SEP-IRAs and Solo 401(k)s are popular retirement options for freelancers, but they have different contribution limits, setup requirements, and flexibility — making the choice crucial for tax planning.

SEP-IRA vs Solo 401(k): Which is Better for Freelancers?

Quick Answer

Solo 401(k)s are better for most freelancers because they allow higher contributions — up to $70,000 vs $17,500 for SEP-IRAs in 2026. Solo 401(k)s also offer loan options and Roth contributions, while SEP-IRAs are simpler to set up and maintain with lower administrative burden.

Best Answer

Priya Sharma, Small Business Tax Analyst

Best for established freelancers comparing retirement account options to maximize tax savings and retirement contributions

The key difference: Contribution limits

The biggest difference between SEP-IRAs and Solo 401(k)s is how much you can contribute, and for most freelancers, this makes Solo 401(k)s the clear winner.

2026 Contribution Limits:

SEP-IRA: Up to 25% of net self-employment income (max $17,500)

Solo 401(k): Up to $70,000 (employee + employer contributions combined)

According to IRS Publication 560, this difference exists because Solo 401(k)s let you make both employee and employer contributions, while SEP-IRAs only allow employer contributions.

Real-world comparison: $80,000 freelance income

Let's compare both options for a freelancer with $80,000 in net self-employment income:

SEP-IRA contribution:

Maximum: $80,000 × 20% = $16,000

Tax savings: ~$3,200-$4,800

Solo 401(k) contribution:

Employee contribution: $23,500

Employer contribution: $80,000 × 20% = $16,000

Total: $39,500

Tax savings: ~$7,900-$11,900

Result: The Solo 401(k) allows $23,500 more in contributions and saves $4,000+ more in taxes annually.

When SEP-IRAs make sense

Despite lower limits, SEP-IRAs have advantages in specific situations:

1. Simplicity: No annual filing requirements (Form 5500) once assets exceed $250,000

2. Multiple providers: Easy to open accounts at different brokerages

3. Employee situations: If you plan to hire employees, SEP-IRAs might be simpler

4. Lower income: If you earn less than $30,000, the difference is minimal

When Solo 401(k)s are better

For income over $35,000: Solo 401(k)s almost always allow higher contributions

For cash flow flexibility: Employee contributions by Dec 31, employer by tax deadline

For loan access: Borrow up to $50,000 from your account

For Roth options: Many providers offer Roth Solo 401(k) contributions

Administrative comparison

SEP-IRA setup and maintenance:

Setup: Fill out IRS Form 5305-SEP (one page)

Annual maintenance: None until $250,000+ in assets

Cost: Usually free at major brokerages

Solo 401(k) setup and maintenance:

Setup: Adopt a plan document, establish account

Annual maintenance: Form 5500-EZ if assets exceed $250,000

Cost: Usually free, but some providers charge for plan documents

The breakeven analysis

Here's when each option makes the most sense:

Choose SEP-IRA if:

Net self-employment income under $35,000

You want maximum simplicity

You might hire employees soon

You're uncomfortable with 401(k) complexity

Choose Solo 401(k) if:

Net self-employment income over $35,000

You want maximum tax deductions

You value loan access or Roth options

You're comfortable with slightly more paperwork

What you should do

For most established freelancers earning $40,000+, Solo 401(k)s provide significantly higher tax savings. Start by calculating your maximum contribution under both scenarios using our deduction finder tool. The extra contribution capacity usually outweighs the slight increase in administrative complexity.

Key takeaway: Solo 401(k)s beat SEP-IRAs for most freelancers earning $35,000+ because they allow contributions up to $70,000 vs $17,500 maximum for SEP-IRAs, potentially saving $4,000+ more in annual taxes.

Key Takeaway: Solo 401(k)s beat SEP-IRAs for most freelancers earning $35,000+ because they allow contributions up to $70,000 vs $17,500 maximum for SEP-IRAs, potentially saving $4,000+ more in annual taxes.

Compare your SEP-IRA vs Solo 401(k) options →

SEP-IRA vs Solo 401(k) comparison by income level

Income Level	SEP-IRA Max	Solo 401(k) Max	Difference	Extra Tax Savings (Solo 401k)
$25,000	$5,000	$28,500*	$3,500*	$700-$1,200*
$50,000	$10,000	$33,500	$23,500	$4,700-$8,000
$75,000	$15,000	$38,500	$23,500	$4,700-$8,000
$87,500	$17,500	$41,000	$23,500	$4,700-$8,000
$100,000+	$17,500	$43,500+	$26,000+	$5,200-$8,800+

More Perspectives

Priya Sharma, Small Business Tax Analyst

For six-figure freelancers who need maximum retirement contributions and sophisticated tax planning strategies

The high-earner verdict: Solo 401(k) wins decisively

For freelancers earning $100K+, the choice between SEP-IRA and Solo 401(k) isn't even close. The contribution limits tell the whole story:

At $150,000 income:

SEP-IRA maximum: $17,500 (hitting the 2026 limit)

Solo 401(k) maximum: $53,500+

Extra tax savings with Solo 401(k): $8,000-$14,000 annually

Advanced Solo 401(k) strategies for high earners

1. Defined benefit combo: Layer a defined benefit plan on top for contributions up to $300,000+ annually

2. Spousal Solo 401(k): If your spouse works in the business, double your household retirement contributions

3. Backdoor Roth conversions: Use Solo 401(k) funds for strategic Roth conversions in lower-income years

Why SEP-IRAs fall short for high earners

The 25% contribution limit (effectively 20% of gross income) caps SEP-IRA contributions at $17,500 in 2026. This leaves massive tax savings on the table:

$200,000 freelancer comparison:

SEP-IRA: $17,500 contribution, ~$5,250 tax savings

Solo 401(k): $63,500+ contribution, ~$19,000+ tax savings

Lost opportunity: $14,000 annual tax savings

Over 20 years, this difference compounds to hundreds of thousands in lost retirement wealth.

Key takeaway: High-earning freelancers lose $8,000-$14,000+ annually in tax savings by choosing SEP-IRAs over Solo 401(k)s, making Solo 401(k)s essential for serious wealth building.

Key Takeaway: High-earning freelancers lose $8,000-$14,000+ annually in tax savings by choosing SEP-IRAs over Solo 401(k)s, making Solo 401(k)s essential for serious wealth building.

James Okafor, Self-Employment Tax Specialist

For first-year freelancers who need simple guidance on choosing their first retirement account without getting overwhelmed

The beginner's perspective: Start with what you'll actually use

As a new freelancer, both SEP-IRAs and Solo 401(k)s can feel overwhelming. The key is choosing the option you'll actually contribute to consistently, rather than getting paralyzed by the "perfect" choice.

Simple decision framework

If your first-year freelance income is under $30,000:

Both options work similarly well

SEP-IRA might be slightly easier to understand

Contribution difference: Only $2,000-$4,000

If you expect to earn $40,000+ consistently:

Solo 401(k) becomes significantly better

Worth the small learning curve

Future flexibility is valuable

Real beginner example

Say you made $25,000 in your first freelance year:

SEP-IRA: Contribute up to $5,000 (20% of income)

Solo 401(k): Contribute up to $28,500 (but realistically $5,000-$10,000)

Practical difference: Minimal in year one, but Solo 401(k) grows with your income.

My recommendation for beginners

Start with a Solo 401(k) if you plan to freelance long-term and expect growing income. The setup is only slightly more complex, but you won't need to switch accounts later as you earn more.

Getting started steps:

1. Open Solo 401(k) at Schwab, Vanguard, or Fidelity (all free)

2. Start with small monthly contributions ($200-$500)

3. Invest in a target-date fund (simple and diversified)

4. Increase contributions as your income grows

Key takeaway: New freelancers should choose Solo 401(k)s over SEP-IRAs if they plan to grow their income beyond $35,000, as the future contribution flexibility outweighs the minimal setup complexity.

Key Takeaway: New freelancers should choose Solo 401(k)s over SEP-IRAs if they plan to grow their income beyond $35,000, as the future contribution flexibility outweighs the minimal setup complexity.

Sources

IRS Publication 560 — Retirement Plans for Small Business
IRS Publication 590-A — Contributions to Individual Retirement Arrangements (IRAs)

SEP-IRA vs Solo 401(k) — which is better for freelancers?