Self-Employed Retirement Accounts
Solo 401(k)
Best for: Solopreneurs with no employees (other than a spouse).
2026 limits: Up to $23,500 employee deferral + $23,500 catch-up (age 50+) + 25% employer profit-sharing contribution. Total maximum: $69,000 ($76,500 with catch-up up to $70,000 depending on self-employment income limits).
Key features: Can make Roth contributions. Can borrow from the plan (loans up to $50,000 or 50% of balance). Easy to set up (one-page adoption agreement). Must file Form 5500-EZ annually when assets exceed $250,000 (otherwise no annual filing — best among small business plans). Requires a plan document from a provider like Vanguard, Fidelity, Schwab, or Solo 401(k) specialty providers. Can invest in almost anything, including real estate (with a self-directed Solo 401k).
SEP IRA
Best for: Self-employed with variable income, or businesses with employees.
2026 limits: Up to 25% of compensation or $69,000, whichever is less. Contributions are employer-side only (not employee deferrals). All contributions are pre-tax (no Roth option). Must contribute the same percentage for all eligible employees (if you have them).
Key features: Easy to set up. No annual filing required (no Form 5500). Deadline: can contribute up to your tax filing deadline (including extensions) — great for last-minute tax planning. Employees must be 21+, worked 3 of last 5 years, and earned $750+ (2026, inflation-adjusted). IRA-based: lower costs, wider provider selection.
SIMPLE IRA
Best for: Businesses with 100 or fewer employees.
2026 limits: $16,000 employee deferral + $3,500 catch-up (age 50+). Employer either matches employee contributions dollar-for-dollar up to 3% of compensation, or makes a flat 2% contribution for all eligible employees regardless of whether they contribute.
Key features: Easy to set up and low cost. No nondiscrimination testing (unlike 401(k) plans). Higher contribution limits than SEP IRA for lower-income self-employed. Two-year waiting period for rollovers in the first 2 years (can only transfer to another SIMPLE IRA). Eligibility: employees with $5,000+ compensation in any prior 2 years.
Comparison
| Factor | Solo 401(k) | SEP IRA | SIMPLE IRA |
|---|---|---|---|
| Max Contribution (2026) | $69,000 ($76,500 50+) | $69,000 | $16,000 ($19,500 50+) |
| Roth Option | Yes | No | No |
| Loans | Yes | No | No |
| Employees Must Be Covered | No (no employees allowed except spouse) | Yes (same % for all) | Yes (match or 2%) |
| Form 5500 Filing | If >$250k | No | No |
| Setup Deadline | Dec 31 | Tax filing deadline | Oct 1 (or later for new businesses) |
| Contribution Deadline | Tax filing deadline | Tax filing deadline | Tax filing deadline |
Which Should You Choose?
- No employees, want max savings: Solo 401(k) — highest contribution limits, Roth option, loan feature.
- No employees, want simplicity: SEP IRA — easier to set up, no annual filing, contribute by tax day.
- Have employees, want to minimize costs: SIMPLE IRA — lower employer contribution requirements than SEP.
- Have employees, want high business deductions: SEP IRA — can deduct up to $69k per employee (which is expensive).
- Want Roth contributions for yourself: Solo 401(k) is the only option.