SEP IRA, SIMPLE IRA and Solo 401(k): Choosing the Right Retirement Plan for Small Business Owners in 2026
Compare SEP IRA, SIMPLE IRA, and Solo 401(k) plans for 2026. Learn contribution limits, eligibility rules, and which retirement plan may fit your small business or self-employment income.
By Kendall Maccagnan, CPA, CFP® and Financial Advisor in Tampa, Florida
Key Takeaways
SEP IRAs, SIMPLE IRAs, and Solo 401(k) plans are three common retirement options for small business owners, each with different contribution structures and requirements
SEP IRAs offer simplicity and flexibility, with discretionary employer only contributions
SIMPLE IRAs allow both employer and employee contributions but require annual employer funding
Solo 401(k) plans may allow the highest total contributions for self-employed individuals with no employees
The right plan depends on factors such as business size, income stability, employee structure, and desired contribution flexibility
Introduction
Choosing the right retirement plan is an important decision for small business owners and self-employed individuals. The structure of your plan can impact how much you are able to contribute, how flexible those contributions are, and whether employees can participate. Several retirement plan options are commonly used in small business settings, including SEP IRAs, SIMPLE IRAs, and Solo 401(k) plans. Each has different rules around contributions, eligibility, and administrative requirements. Understanding how these plans compare can help business owners evaluate which approach may align best with their income, workforce, and long-term financial goals.
SEP IRA vs SIMPLE IRA vs Solo 401(k): Which Retirement Plan Is Right for Your Small Business?
What is a SEP IRA?
A Simplified Employee Pension IRA, commonly known as a SEP IRA, is one of the most straightforward retirement plans available to small business owners. Unlike a Solo 401(k) which is generally designed for owner only businesses, a SEP IRA can be implemented in businesses with employees of any size, including self-employed individuals.
SEP IRA contributions are made entirely by the employer and employees generally cannot contribute their own salary to the plan. Contributions are discretionary each year meaning an employer is not required to contribute every year. However when contributions are made they must be made for all eligible employees at the same percentage of compensation. There is generally no annual IRS filing requirement making SEP plan administration straightforward and low cost.
Who a SEP IRA May be Best For
The SEP IRA tends to work well for self-employed individuals and small business owners who want a simple low cost plan with maximum flexibility. It may be particularly well suited for business owners with variable income who want the ability to contribute in profitable years and reduce or skip contributions in leaner ones without the administrative burden of a more complex plan.
Employee Eligibility for a SEP IRA
In a SEP plan, an employer can generally exclude employees with fewer than three years of service but must generally cover all employees who have at least three years of service and have received at least $800 in compensation in 2026. This eligibility structure can make the SEP IRA a cost effective option for businesses with a high proportion of short-term employees. For businesses with many long-term or part-time employees however the requirement to cover all eligible employees at the same contribution percentage may make a different plan more cost effective.
2026 SEP IRA Contribution Limits
For 2026 SEP IRA contributions are generally limited to the lesser of 25% of each employee's compensation or $72,000. The compensation used to calculate contributions is capped at $360,000 for 2026. For self-employed individuals the calculation is based on net self-employment income and follows a special computation effectively resulting in an approximate 20% rate on net earnings, consistent with how sole proprietor contributions are calculated under IRS Publication 560.
What Is a SIMPLE IRA?
A Savings Incentive Match Plan for Employees (SIMPLE) IRA, is a retirement plan designed for small businesses with 100 or fewer employees. Unlike a SEP IRA where only the employer contributes, a SIMPLE IRA allows both the employer and employees to contribute to the plan. This may make it a more competitive retirement benefit for attracting and retaining employees while still offering a lower administrative burden than a traditional 401(k).
Employee Eligibility for a SIMPLE IRA
A SIMPLE IRA plan can generally be established by an employer with 100 or fewer employees who received at least $5,000 in compensation during the prior year, provided the employer does not maintain another retirement plan for the same employees. Employees who received at least $5,000 in compensation during any two preceding years and are reasonably expected to receive at least $5,000 during the current year are generally eligible to participate. An employer can use less restrictive eligibility requirements but not more restrictive ones.
2026 Contribution Limits for a SIMPLE IRA
For 2026 employees may contribute up to $17,000 through salary reduction contributions. Employees age 50 and older may make an additional catch up contribution of $4,000 for a total of $21,000. Employees ages 60 through 63 may contribute an enhanced catch-up of $5,250 under SECURE 2.0 instead of the standard $4,000. Employer contributions are generally required and come in one of two forms. The employer must either match employee contributions dollar for dollar up to 3% of compensation or make a nonelective contribution of 2% of compensation for all eligible employees regardless of whether the employee contributes. The compensation used to calculate the 2% nonelective contribution is capped at $360,000 for 2026.
SIMPLE IRA Important Consideration
Early withdrawals from a SIMPLE IRA within the first two years of participation are subject to a 25% penalty rather than the standard 10% that applies to most retirement accounts. After the two year period the standard 10% early withdrawal penalty applies. This is an important planning consideration for employees who may need access to funds in the early years of the plan.
Who a SIMPLE IRA May Be Best For
The SIMPLE IRA tends to work well for small businesses with up to 100 employees who want to offer employees a meaningful retirement benefit without the administrative complexity of a traditional 401(k). It may be a good fit for businesses that want employees to have the ability to contribute their own salary toward retirement and where the employer is comfortable with a required annual contribution obligation.
What is a Solo 401(k)?
The Solo 401(k), also known as a One-Participant 401(k), is a retirement plan designed specifically for self-employed individuals and business owners with no common law employees other than a spouse. Because the owner contributes as both the employee and the employer, total annual contributions for 2026 can reach up to $72,000 or more if you include catch up contributions (depending on age), making it one of the highest contribution vehicles available to self-employed individuals. The plan also offers a Roth contribution option, no nondiscrimination testing, and meaningful flexibility around contribution timing.
For a full breakdown of contribution limits, SECURE 2.0 updates, key rules, and deadlines, see the dedicated article on Solo 401(k) plans in 2026.
Other Plans to Consider
What are Defined Benefit Plans and How Can They Be Used for Small Business Owners?
For high income business owners who have maximized contributions to other plan types or who want to shelter significantly more than the Solo 401(k) limit of $72,000 per year from taxes, a defined benefit plan may be worth exploring. For 2026 the annual benefit limit for a defined benefit plan is $290,000. These plans can also be combined with other plans such as a Solo 401(k) for even greater combined contributions in certain situations. The tradeoff is cost and complexity. Defined benefit plans require an actuary to calculate annual contributions, generally require consistent annual funding regardless of business performance, and carry higher administrative costs than the IRA based plans covered in this article. They tend to be most appropriate for older high income business owners with stable income and few or no employees.
Traditional and Roth IRAs as a Supplemental Option for Small Business Owners
While not a business specific retirement plan, Traditional and Roth IRAs are worth mentioning as a supplemental savings option alongside any of the plans discussed above. For 2026 the IRA contribution limit is $7,500 with an additional $1,100 catch-up contribution available for those age 50 and older. Keep in mind that Roth IRA contributions are subject to phase out ranges making them unavailable to some higher income business owners. The IRA is generally not a replacement for a business retirement plan given its significantly lower contribution limits but can serve as an additional savings vehicle for business owners who have already maximized contributions to their primary plan.
Comparison of SEP IRA, SIMPLE IRA, and Solo 401(k)
2026 Retirement Plan Comparison for Small Business Owners | |||
SEP IRA | SIMPLE IRA | Solo 401(k) | |
Who Can Establish | Any business size including self-employed | Businesses with 100 or fewer employees | Owner only businesses with no common law employees other than a spouse |
Employer Contribution Required | Yes when contributions are made | Yes | No fixed employer contribution requirement |
Employee Contributions Allowed | No | Yes | Yes |
Roth Option Available | May be available | May be available | May be available |
Annual IRS Filing Required | Generally no | Generally no | Yes, 5500-EZ required once assets exceed $250,000 |
Administrative Complexity | Very Low | Low | Low to Medium |
Best For | Simplicity and contribution flexibility | Businesses wanting to offer employees a retirement benefit | Owner only businesses wanting maximum contributions |
How to choose between plans?
While individual circumstances may vary, the following general examples may help guide small business owners toward the most appropriate plan for their situation.
If you are a solopreneur looking to maximize contributions and do not mind a bit of plan setup and maintenance, a Solo 401(k) may be worth considering.
If you are self-employed or run a small business and want the simplest possible plan with no annual IRS filing requirement, a SEP IRA may be a good starting point.
If your income varies significantly from year to year, a SEP IRA may offer useful flexibility since contributions are discretionary and do not need to be made every year.
If you have employees and want to offer them the ability to contribute their own salary toward retirement without the complexity of a traditional 401(k), a SIMPLE IRA may be worth exploring.
If you have employees and anticipate a high proportion of short-term workers, a SEP IRA may be more cost effective given the three year service eligibility requirement for employee coverage.
If you are a high income business owner who has already maximized contributions to other plan types and wants to shelter significantly more from taxes, a defined benefit plan may be worth a conversation with a qualified tax advisor.
If you are unsure which plan is the right fit for your business, a qualified CPA or financial advisor can help you evaluate your options based on your specific business structure, income level, and retirement goals.
This content is provided for educational and informational purposes only and should not be construed as investment, tax, or legal advice. It is not intended as a solicitation or offer to provide advisory services in any jurisdiction where Off The Bay Wealth, LLC is not properly registered or otherwise permitted to operate. Information presented is based on sources believed to be reliable; however, accuracy and completeness are not guaranteed. This material is not intended to be a comprehensive analysis of all topics discussed. IRS provisions are subject to ongoing guidance and regulatory updates. Any financial decisions should be made in consideration of your individual circumstances, including your goals, risk tolerance, and time horizon. Investing involves risk, including the potential loss of principal.
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