SEP IRA vs Solo 401(k): Which Is Better for You?

SEP IRA and Solo 401(k) are the two most popular retirement accounts for self-employed individuals. Both offer significant tax advantages and high contribution limits, but they work differently. This detailed comparison helps you choose the right one. ## Quick Comparison | Feature | SEP IRA | Solo 401(k) | |---------|---------|-------------| | Max Contribution (2026) | $69,000 | $69,000 + $23,000 | | Contribution Type | Employer only | Employee + Employer | | Roth Option | No | Yes (often) | | Loan Provision | No | Yes (up to $50,000) | | Setup Deadline | Tax filing deadline | December 31 | | Filing Requirements | None | Form 5500-EZ when >$250K | | Complexity | Simple | Moderate | ## SEP IRA Deep Dive ### What Is a SEP IRA? A Simplified Employee Pension (SEP) IRA is a retirement account where you, as both employer and employee, make employer contributions on your own behalf. Think of it as giving yourself an employer match—except you’re the employer. ### 2026 Contribution Limits Formula: 25% of net self-employment income, up to $69,000 Actual calculation: Net SE income × 92.35% × 25% = Maximum contribution ### SEP IRA Contribution Examples | Net SE Income | Max SEP Contribution | |---------------|---------------------| | $50,000 | $11,544 | | $75,000 | $17,316 | | $100,000 | $23,088 | | $150,000 | $34,631 | | $276,000+ | $69,000 | ### SEP IRA Advantages Simplicity: Open at any brokerage in minutes. No plan documents, no annual filing, minimal paperwork. Deadline Flexibility: Contribute up until your tax filing deadline, including extensions. Decide in April how much to contribute for the previous year. Flexible Contributions: Contribute any amount up to the limit each year. No minimum required. Low Cost: No setup fees at most brokerages. No ongoing administrative costs. ### SEP IRA Disadvantages No Employee Contributions: You can only make employer contributions. No option to contribute salary as an employee would. No Roth Option: All contributions are pre-tax. No after-tax Roth contributions available. No Loans: Cannot borrow from your SEP IRA. Employee Complications: If you have employees, you must contribute the same percentage for all eligible employees. ## Solo 401(k) Deep Dive ### What Is a Solo 401(k)? A Solo 401(k)—also called Individual 401(k) or Self-Employed 401(k)—functions like a traditional 401(k) but for businesses with no employees (except a spouse). You can make both employee AND employer contributions. ### 2026 Contribution Limits Employee contribution: Up to $23,000 ($30,500 if 50+) Employer contribution: Up to 25% of net SE income Combined maximum: $69,000 ($76,500 if 50+) ### Solo 401(k) Contribution Examples | Net SE Income | Employee | Employer | Total | |---------------|----------|----------|-------| | $50,000 | $23,000 | $11,544 | $34,544 | | $75,000 | $23,000 | $17,316 | $40,316 | | $100,000 | $23,000 | $23,088 | $46,088 | | $150,000 | $23,000 | $34,631 | $57,631 | ### Solo 401(k) Advantages Higher Contribution Potential: The employee contribution component allows saving significantly more at lower income levels. Roth Option: Many providers offer Roth 401(k) contributions, allowing after-tax savings with tax-free growth. Loan Provision: Borrow up to 50% of account value or $50,000, whichever is less. Repay over 5 years. Catch-Up Contributions: Additional $7,500 if you’re 50 or older. Spousal Participation: If your spouse works in your business, they can also contribute, potentially doubling household retirement savings. ### Solo 401(k) Disadvantages Setup Deadline: Must establish the plan by December 31 of the contribution year. Can’t decide in April like SEP IRA. More Complex: Requires plan documents and adoption agreement. Annual Filing: Form 5500-EZ required when assets exceed $250,000. No Employees: Can’t have full-time employees other than yourself and spouse. Part-time employees (<1,000 hours/year) are generally okay. ## Side-by-Side Scenarios ### Scenario 1: $60,000 Net Income | Account | Max Contribution | |---------|------------------| | SEP IRA | $13,853 | | Solo 401(k) | $36,853 | Winner: Solo 401(k) by $23,000 ### Scenario 2: $150,000 Net Income | Account | Max Contribution | |---------|------------------| | SEP IRA | $34,631 | | Solo 401(k) | $57,631 | Winner: Solo 401(k) by $23,000 ### Scenario 3: $300,000+ Net Income | Account | Max Contribution | |---------|------------------| | SEP IRA | $69,000 | | Solo 401(k) | $69,000 ($76,500 if 50+) | Winner: Tie (Solo 401(k) slight edge with catch-up) ### Scenario 4: Variable Income, Late Decision | Account | Flexibility | |---------|-------------| | SEP IRA | Can decide by April tax deadline | | Solo 401(k) | Must establish by Dec 31 | Winner: SEP IRA for flexibility ## Decision Framework ### Choose SEP IRA If: ✓ You want the simplest possible setup ✓ Your income is high enough that contribution limits are similar ✓ You want maximum flexibility on when to decide ✓ You don’t need Roth options ✓ You don’t want administrative requirements ### Choose Solo 401(k) If: ✓ You want to maximize retirement savings ✓ Your income is under $250,000 (where the difference is largest) ✓ You want Roth contribution options ✓ You might need to borrow from retirement funds ✓ You’re 50+ and want catch-up contributions ✓ Your spouse can also participate ## Can You Have Both? Technically yes, but combined employer contributions share the same limit. There’s rarely a reason to have both—choose one. Exception: If transitioning from one to the other, you might briefly have both during the changeover. ## Provider Comparison ### Best SEP IRA Providers - Fidelity: No fees, broad investments

• Vanguard: Low-cost index funds
• Charles Schwab: No minimums, good service ### Best Solo 401(k) Providers - Fidelity: Free, easy setup, Roth option
• Charles Schwab: Comprehensive features
• E*TRADE: Good platform, Roth available Note: Some providers charge fees for Solo 401(k) plans. Fidelity and Schwab are both free. ## Tax Strategy Considerations ### Traditional vs Roth Traditional (Both):
• Deduct contributions now
• Pay taxes on withdrawals in retirement
• Best if current tax rate > expected retirement rate Roth (Solo 401(k) only):
• No deduction now
• Tax-free withdrawals in retirement
• Best if current rate < expected retirement rate
• Good for tax diversification ### Mega Backdoor Roth Some Solo 401(k) plans allow after-tax contributions beyond the normal limit, which can then be converted to Roth—the “mega backdoor Roth.” This requires a plan that specifically allows it. ## FAQ ### Can I switch from SEP IRA to Solo 401(k)? Yes. You can stop contributing to SEP IRA and establish a Solo 401(k). You can also potentially roll the SEP IRA into the Solo 401(k) to consolidate accounts. Consult a tax professional for your specific situation. ### What if I have employees? SEP IRA requires contributing the same percentage for all eligible employees. Solo 401(k) is not available if you have employees other than a spouse. Consider a SIMPLE IRA or traditional 401(k) instead. ### Can I contribute to both in the same year? Yes, but combined employer contributions share the same limit. There’s no advantage to contributing to both—just use one account. ### Do these affect my ability to have a traditional/Roth IRA? You can have a Traditional or Roth IRA alongside either account. However, having a workplace plan (SEP or Solo 401k) affects the deductibility of Traditional IRA contributions if your income exceeds certain thresholds. ### What’s the catch-up contribution for 2026? For Solo 401(k), those 50 and older can contribute an additional $7,500 as an employee catch-up contribution (total employee contribution of $30,500). SEP IRAs don’t have catch-up provisions. ## Conclusion For most solo freelancers, the choice comes down to: Choose SEP IRA for: Maximum simplicity with good contribution limits Choose Solo 401(k) for: Maximum contributions, Roth option, or loan access If you’re earning under $200,000 and want to maximize retirement savings, the Solo 401(k) is typically the better choice. The additional employee contribution can add $23,000+ to your annual savings. If simplicity is paramount and you’re a high earner where limits converge, SEP IRA’s ease of use and deadline flexibility make it attractive. Either choice is far better than no retirement savings at all. Pick one, open an account, and start contributing. You can always reassess as your business grows.