SEP IRA vs Solo 401(k): Which Retirement Account Is Better for Self-Employed?
If you are self-employed β freelancer, consultant, contractor, or small business owner with no employees β you have access to two of the most powerful retirement accounts available: the SEP IRA and the Solo 401(k). Both give you a substantial tax deduction now and tax-deferred growth until retirement. The right choice depends on your income level, whether you plan to hire employees, and whether you want a Roth option.
Here is a clear breakdown.
How each account works
SEP IRA (Simplified Employee Pension)
The SEP IRA is exactly what the name implies: simple. You open one at any brokerage in about 10 minutes. There are no annual IRS filings, no mandatory contributions, and no complex rules.
Contribution rule: You contribute as the βemployer.β The limit is 25% of net self-employment income, up to the annual IRS maximum (approximately $70,000 for 2026 β confirm at IRS.gov as it adjusts annually).
What βnet self-employment incomeβ means in practice: your net profit minus half your self-employment tax. For someone netting $80,000 from freelance work:
- Net SE income after SE tax deduction: ~$73,900
- SEP IRA max contribution: $73,900 Γ 25% = ~$18,475
If you have W-2 employees, you must also contribute the same percentage to their SEP IRAs β which is why this account becomes expensive once you have a team.
Solo 401(k)
The Solo 401(k) β also called an Individual 401(k) or Self-Employed 401(k) β works like an employer-sponsored 401(k), except you wear both hats.
Contribution rule: Two separate pieces add together:
- Employee elective deferral: Up to $23,500 in 2026 (plus $7,500 catch-up if you are 50+), regardless of income
- Employer contribution: Up to 25% of net SE income
Combined limit: ~$70,000 (or $77,500 with catch-up).
For that same $80,000 net income:
- Employer contribution: ~$18,475 (same math as SEP IRA)
- Employee deferral: $23,500
- Solo 401(k) max: ~$41,975
Same income. The Solo 401(k) lets you shelter more than twice as much.
Side-by-side comparison
| Β | SEP IRA | Solo 401(k) |
|---|---|---|
| Who can use it | Self-employed, even with employees | Self-employed with NO employees (except spouse) |
| 2026 contribution limit | 25% of net SE income, up to ~$70K | $23,500 (employee) + 25% of net SE income, up to ~$70K combined |
| Roth option | No | Yes (Roth Solo 401k available at most brokerages) |
| Loans allowed | No | Yes (borrow up to 50% of balance, max $50,000) |
| Annual IRS filing | None | Form 5500-EZ required once balance exceeds $250,000 |
| Setup time | ~10 minutes | Slightly more paperwork upfront |
| Employees | Can add; must cover eligible employees | Must close or convert once you hire non-spouse employees |
| Contribution deadline | Your tax filing deadline + extensions | Plan must be opened by December 31; contributions by tax filing deadline |
Real numbers: who wins at different income levels
| Net SE income | SEP IRA max | Solo 401(k) max | Solo 401k advantage |
|---|---|---|---|
| $40,000 | ~$9,270 | ~$32,770 | +$23,500 |
| $80,000 | ~$18,475 | ~$41,975 | +$23,500 |
| $150,000 | ~$34,630 | ~$58,130 | +$23,500 |
| $280,000+ | ~$70,000 | ~$70,000 | Equal |
The advantage is constant and large at every income level below about $280,000. Only when you earn enough for your 25% employer contribution alone to hit the IRS cap do both accounts produce the same result.
For someone in the 22% federal bracket who maxes both the employee deferral and employer contribution: contributing an extra $23,500 to a Solo 401(k) instead of stopping at a SEP IRA cuts their federal tax bill by about $5,170 in the current year β in addition to state income tax savings.
When to choose each account
Choose the Solo 401(k) if:
- You earn under ~$280,000 in net SE income (almost always)
- You want a Roth option for tax diversification in retirement
- You want the ability to take a loan if needed
- You have no plans to hire employees in the near term
Choose the SEP IRA if:
- You plan to hire employees relatively soon and want a plan that can scale
- You want the absolute minimum paperwork and administration
- You are just starting self-employment and not yet earning consistently
The Roth Solo 401(k): worth mentioning
Most brokerages (Fidelity, Charles Schwab, Vanguard) now offer a Roth election on the employee contribution portion of a Solo 401(k). That means you can contribute after-tax dollars now and withdraw the money tax-free in retirement. For someone early in their career, in a lower tax bracket, or who expects higher taxes in retirement, this is a meaningful advantage the SEP IRA simply cannot match.
This flexibility is one reason the Solo 401(k) is recommended for most self-employed earners under $280,000.
How this fits into the bigger picture
Whether you choose a SEP IRA or Solo 401(k), the priority order matters. Before maximizing either account:
- Contribute enough to any employer-sponsored 401(k) from a day job to capture the full match
- Pay off high-interest debt (credit cards above 10% APR)
- Build a three-to-six-month emergency fund in a high-yield savings account
Once those are handled, maxing your Solo 401(k) is one of the best tax moves available to a self-employed person. Pair it with the index funds for beginners guide to decide what to invest those contributions in once the account is open.
If you are also managing irregular income and need a system for consistently finding contribution money, zero-based budgeting works well for self-employed earners because it forces you to plan each monthβs cash flow in advance.
The bottom line
For most self-employed people earning under $280,000, the Solo 401(k) wins β it lets you contribute an extra $23,500 per year on top of the employer percentage, it offers a Roth option, and it allows loans. The SEP IRA wins only when simplicity outweighs contribution limits, or when you have employees to cover. Open a Solo 401(k) before December 31 to lock in 2026 contributions.
