SEP IRA vs SIMPLE IRA: Choosing for Small Businesses
Compare contribution limits and rules to pick the right small business retirement plan.
SEP and SIMPLE IRAs are popular retirement plans for small businesses, but they have very different limits and rules. This guide helps self-employed business owners and employers compare the two --- and know when a Solo 401(k) might beat them both.
Key Takeaways
- SEP IRAs allow large employer-only contributions (up to $72,000 in 2026).
- SIMPLE IRAs allow employee deferrals but have lower limits ($17,000 in 2026).
- Solo 401(k) can outperform both when eligible.
- Both SEP and SIMPLE IRA balances trigger the Pro-Rata Rule, which can block your Backdoor Roth.
SEP IRA
- Employer-only contributions
- Higher contribution limits
- Simple administration
SEP IRA Limits (2025 vs 2026)
| Limit Type | 2025 | 2026 |
|---|---|---|
| Max employer contribution | $70,000 | $72,000 |
Employer contributions are generally capped at 25% of compensation (or about 20% of net self-employment income), with the dollar cap above as the hard maximum.
SEP IRA and the Pro-Rata Rule
One important drawback: SEP IRA balances count as pre-tax IRA money. If you also want to pursue a Backdoor Roth IRA conversion, the Pro-Rata Rule will create a tax bill on the conversion. This is a major reason many solopreneurs choose a Solo 401(k) instead --- see our Solo 401(k) vs SEP IRA comparison for details.
SIMPLE IRA
- Employee deferrals plus employer match
- Lower limits
- Easier to set up than a 401(k)
SIMPLE IRA Limits (2025 vs 2026)
| Limit Type | 2025 | 2026 |
|---|---|---|
| Employee deferral | $16,500 | $17,000 |
| Catch-up (age 50+) | $3,500 | $4,000 |
Some employers can offer higher SIMPLE limits; check your plan rules.
SEP IRA vs SIMPLE IRA: Side-by-Side Comparison
| Feature | SEP IRA | SIMPLE IRA |
|---|---|---|
| Who contributes | Employer only | Employee + employer match |
| 2025 max contribution | $70,000 (25% of comp) | $16,500 deferral + match |
| 2026 max contribution | $72,000 (25% of comp) | $17,000 deferral + match |
| Catch-up (age 50+) | None | $3,500 (2025), $4,000 (2026) |
| Employer obligation | Contribute same % for all eligible employees | Match up to 3% or flat 2% |
| Setup deadline | Tax filing deadline (with extensions) | October 1 of the plan year |
| Roth option | No | No (generally) |
| Loan provision | No | No |
| Pro-Rata Rule impact | Yes (blocks Backdoor Roth) | Yes (blocks Backdoor Roth) |
Which Plan Should You Choose?
Choose a SEP IRA if:
- You want to make large employer contributions
- You have few or no employees (contributions must be equal percentage for all)
- You want simple administration and late setup flexibility
Choose a SIMPLE IRA if:
- You have employees who want to make their own deferrals
- You want a low-cost plan with mandatory employer contributions
- Your business has 100 or fewer employees
Choose a Solo 401(k) if:
- You have no full-time employees (other than a spouse)
- You want the highest possible contribution limits
- You want Roth contribution options
- You also want to do a Backdoor Roth IRA without triggering the Pro-Rata Rule
When to Consider a Solo 401(k)
If you have no full-time employees, the Solo 401(k) often offers the highest limits and Roth options. At $50,000 of net profit, a Solo 401(k) can shelter roughly $34,500 versus only $10,000 with a SEP IRA. See the Solo 401(k) strategy and our detailed Solo 401(k) vs SEP IRA comparison.
For a broader overview of retirement and tax reduction approaches for the self-employed, including HSA and defined benefit plans, see our self-employed tax strategies guide.
How sharper.tax Helps
When you upload your tax return to sharper.tax, our platform analyzes your self-employment income and identifies which retirement plan would maximize your tax-deferred savings. We compare SEP IRA, SIMPLE IRA, and Solo 401(k) contribution limits based on your actual income and flag unused contribution room. Sophisticated tax planning used to require a high-end CPA --- we make it available for free.
Sources
- IRS Notice 2025-67 (2026 retirement plan limits)
- IRS Publication 560 (2025 small business retirement limits)
The information above is educational and not tax advice.