Solo 401(k) vs. SEP IRA: Which Retirement Plan Is Right for You?

Aug 4, 2026

By Jared Collum

For self-employed professionals and small business owners, choosing the right retirement plan can make a significant difference in both tax savings today and financial security in retirement. Two of the most popular options are the Solo 401(k) and the SEP IRA. While both offer valuable tax advantages, the right choice depends on your income, business structure, and long-term goals.

Understanding the Solo 401(k)

A Solo 401(k), also known as an Individual 401(k), is designed for business owners with no employees other than a spouse. One of its biggest advantages is that you can contribute as both the employee and the employer, which can create substantial retirement savings opportunities.

Benefits of a Solo 401(k)

  • Higher contribution potential for many self-employed individuals in certain circumstances
  • Roth contribution options available through many plans
  • Catch-up contributions for individuals age 50 and older
  • Some plans allow participant loans

Things to Consider

  • More administrative requirements than a SEP IRA
  • Additional reporting may be required once plan assets reach certain levels
  • Not available if you hire eligible non-spouse employees

Understanding the SEP IRA

A Simplified Employee Pension (SEP) IRA is a retirement plan that allows employers to make contributions on behalf of themselves and eligible employees. It’s known for being easy to establish and maintain while still providing meaningful tax benefits.

Benefits of a SEP IRA

  • Simple setup and administration
  • Flexible contribution amounts from year to year
  • No annual IRS filing requirements for the plan
  • Traditional and Roth contribution options may be available, depending on the financial institution
  • Great option for business owners who value simplicity

Things to Consider

  • Contributions are made only by the employer
  • Roth SEP availability varies by custodian
  • No participant loan feature
  • Employer contributions must generally be made for eligible employees as well

Key Differences

The biggest difference is flexibility. A Solo 401(k) allows both employee and employer contributions, which may result in greater savings potential, especially for individuals with moderate incomes. It also offers features like employee salary deferrals, catch-up contributions, and participant loan provisions that are not available with a SEP IRA.

On the other hand, a SEP IRA shines when it comes to simplicity. There is less paperwork, fewer administrative responsibilities, and more flexibility in deciding how much to contribute each year.

Which Plan Is Right for You?

If your goal is to maximize retirement savings and take advantage of features like employee salary deferrals, catch-up contributions, and potential loan access, a Solo 401(k) is often the stronger choice.

If you prefer a straightforward, easy-to-manage retirement plan with minimal administration, a SEP IRA may be the better fit.

Final Thoughts

Both the Solo 401(k) and SEP IRA can be excellent retirement savings tools for self-employed individuals and small business owners. The Solo 401(k) generally provides greater flexibility and contribution opportunities, while the SEP IRA offers simplicity and ease of use. Evaluating your income, business plans, and retirement goals can help determine which option is the best fit for your financial future.

401(k) plans are long-term retirement savings vehicles. Withdrawal of pre-tax contributions and/or earnings will be subject to ordinary income tax and, if taken prior to age 59 1/2, may be subject to a 10% federal tax penalty.

Contributions to a traditional IRA may be tax-deductible depending on the taxpayer’s income, tax-filing status, and other factors. Withdrawal of pre-tax contributions and/or earnings will be subject to ordinary income tax and, if taken prior to age 59 1/2, may be subject to a 10% federal tax penalty.

Raymond James and its advisors do not offer tax or legal advice. You should discuss any tax or legal matters with the appropriate professional.

 

Jared Collum, AIF®, AAMS

FINANCIAL ADVISOR
Pentas Wealth Management
Private Wealth Advisor
Raymond James

PHONE: 229.715.7151

EMAIL: Fraley.Carlton@RaymondJames.com

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