Self-employed workers trade the automatic payroll deduction for a blank check of flexibility — and most leave significant money on the table because no one is nudging them to contribute. The retirement accounts available to the self-employed often allow far larger contributions than a standard workplace 401(k), and every dollar contributed reduces your taxable self-employment income. This is the 2026 guide to picking and using the right account.
What changed in 2026
- Solo 401(k) contribution limits rose. The IRS adjusts limits annually for inflation. In 2026, total contribution limits for defined-contribution plans are in the ~$70,000 range (exact figure confirmed at IRS.gov).
- Roth Solo 401(k) is now more accessible. SECURE 2.0 Act provisions made it easier for Solo 401(k) plans to accept Roth contributions — useful if you expect higher future tax rates.
- Paper SEP-IRA setups are near-zero cost. Major custodians (Fidelity, Vanguard, Schwab) offer free SEP-IRAs with no annual maintenance fees.
- Catch-up contributions increased. Workers 50+ and 60–63 have enhanced catch-up limits under SECURE 2.0; self-employed workers benefit here too.
The main self-employed retirement accounts
| Account |
Best for |
2026 employee contribution |
Employer (profit-sharing) |
Complexity |
| Solo 401(k) |
Solo earners, max contributions |
Up to $23,500 ($31,000 if 50+) |
Up to 25% of net income |
Moderate |
| SEP-IRA |
Simplicity, any net income level |
N/A |
Up to 25% of net income, ~$70K cap |
Low |
| SIMPLE IRA |
Small teams (1–100 employees) |
Up to $16,500 ($20,000 if 50+) |
2–3% match required |
Low-moderate |
| Traditional/Roth IRA |
Low earners, supplement to above |
Up to $7,000 ($8,000 if 50+) |
N/A |
Low |
All limits are approximate 2026 figures — confirm at IRS.gov before filing.
Solo 401(k): the high-ceiling option
A Solo 401(k) (also called an Individual 401k or Self-Employed 401k) is available to business owners with no full-time employees other than a spouse.
You contribute in two roles:
- As employee: up to $23,500 (2026, or $31,000 if 50+)
- As employer: up to 25% of net self-employment income
Combined, you can shelter up to ~$70,000 per year if income is high enough.
Example: Net self-employment income of $120,000.
- Employee contribution: $23,500
- Employer contribution: 25% of ~$84,000 (income after SE tax deduction) ≈ $21,000
- Total: ~$44,500 contributed and deducted
The Roth option (Roth Solo 401k) lets the employee portion grow tax-free — worth considering if you're in a lower bracket now than you expect to be in retirement.
SEP-IRA: the simple option
A Simplified Employee Pension (SEP-IRA) lets you contribute up to 25% of net self-employment income, with the same dollar cap as a Solo 401(k). The calculation is slightly different from a Solo 401(k), effectively ~20% of gross self-employment income before the SE tax deduction.
Why choose SEP over Solo 401(k)?
- Easier to set up (open one at any major custodian online in minutes)
- No annual IRS filing requirement (unlike Solo 401(k), which requires Form 5500-EZ once assets exceed $250,000)
- Fine if your income is moderate and you don't need the higher employee-contribution component
Catch: no Roth option with a SEP-IRA; all contributions are pre-tax.
How to open each
SEP-IRA: Open online at Fidelity, Vanguard, or Schwab. Fill out a form, link your bank account, and fund by tax day (plus extension).
Solo 401(k): Open at a custodian that supports them (Fidelity, E*TRADE, TD Ameritrade/Schwab). More paperwork upfront, but worth it for higher earners. Note: the plan must be established (not just funded) by December 31 of the tax year — you can fund it up to tax day.
Contribution deadline reminder
- SEP-IRA: Contribute up to your tax filing deadline including extensions (typically October 15 for sole proprietors).
- Solo 401(k): The plan must be established by December 31 of the tax year. Contributions can be made up to the filing deadline.
This means you can still open a SEP-IRA in April and contribute it to the prior year.
Common mistakes
Forgetting to account for the SE tax deduction. You can deduct half of SE tax from your gross income; this reduces your net self-employment income, which is the base for calculating your maximum contribution. Use IRS Publication 560 or software to get the math right.
Establishing a Solo 401(k) after December 31. Unlike a SEP-IRA, you cannot retroactively establish a Solo 401(k). If you miss the year-end setup deadline, your only option for that tax year is a SEP-IRA.
Ignoring the Roth Solo 401(k) option. If you're in a lower tax bracket during lean years, routing employee contributions to the Roth side can be valuable.
Investing inside the account in cash. Your contributions need to be invested, not just sitting in cash. A target-date fund is a good default.
What to skip
- Variable annuities inside an IRA — layering an annuity wrapper inside a tax-advantaged account is almost always unnecessary cost.
- Overly complex plan documents from insurance salespeople — a direct custodian like Fidelity offers prototype Solo 401(k) plans for free.
- Skipping contributions in low-income years — even a small contribution preserves the habit and the dollar grows tax-advantaged indefinitely.
FAQ
Can I have both a SEP-IRA and a Solo 401(k)?
No — you cannot contribute to both a SEP-IRA and a Solo 401(k) in the same tax year for the same business. Choose one; the Solo 401(k) usually wins for higher earners.
What if I also have a W-2 job?
You can still contribute to a Solo 401(k) for self-employment income, but the combined employee contributions across all plans cannot exceed the annual limit ($23,500 in 2026).
When should I upgrade from SEP-IRA to Solo 401(k)?
When your net self-employment income is high enough that 25% of it hits the annual cap and you'd benefit from the additional employee-side contribution. Roughly, once net SE income exceeds ~$140,000.
Are Solo 401(k) contributions tax-deductible?
Yes — traditional (pre-tax) Solo 401(k) contributions are deducted from self-employment income, reducing both income tax and SE tax. Roth contributions are not deductible but grow tax-free.
Where to go next
See How to price a freelance project in 2026 to make sure you're earning enough to contribute, How to find tax deductions in 2026 to layer in other deductions, and How to set financial goals in 2026 to build retirement savings into your broader financial plan.