Solo 401(k) vs SEP IRA: Which Should You Choose?

Written by True Tamplin, BSc, CEPF®

Reviewed by Subject Matter Experts

Updated on February 22, 2024

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What Is a Solo 401(k)?

A solo 401(k) is a retirement plan for someone who owns a business. It can be used instead of a SEP IRA. Solo 401(k)s are very popular because they offer a lot of flexibility.

In 2024, you can contribute up to $69,000 per year (plus an additional $7,500 if you are over 50 years old).

This is much more than you can contribute to a SEP IRA. In the United States, a non-profit organization must be set up in order to establish a Solo 401(k).

The organization can be a trade association, chamber of commerce, or other types of business leagues.

You can find more information about setting up a Solo 401(k) on the IRS website.

Deciding between a Solo 401(k) and a SEP IRA? Click here.

How to Set Up a Solo 401(k)?

There are two ways to set up a Solo 401(k):

  • You can establish an account with an investment firm. This is the easiest way to get started, but you will have less control over your investments.
  • You can establish an account with a self-directed Solo 401(k) provider. This option gives you more freedom because you will be able to choose what types of funds and investments are offered in the plan.

    Some providers even let you invest in alternative assets like real estate, precious metals, private equity, or tax liens.

Pros and Cons of the Solo 401(k)

The Solo 401(k) has the following pros:

  • It can be used by self-employed individuals who do not have employees.
  • It offers more investment options than a SEP IRA because you will be able to choose from any fund or type of investment that is offered in the plan.

The only con in setting up a solo 401(k) is it is only worth it if you want to make large contributions and involve more paperwork.

What Is a SEP IRA?

A SEP IRA is a retirement account for small business owners, sole proprietors, and independent contractors.

You can contribute up to 25% of your income or $69,000 (whichever is less).

This is much less than you can contribute to a Solo 401(k). In order to establish a SEP IRA, you must work with your financial institution.

You will not need to create any new organizations like with the solo 401(k).

How to Set Up a SEP IRA?

You can open an account with nearly all brokerage firms.

This is the easiest way to get started, and you will have a lot of investment options. IRS Form 5305-SEP is a formal written agreement required for you to set up a SEP IRA.

However, most brokerage firms will take care of that.

There are no annual fees and opening fees for most of the firms. SEP IRAs can benefit you by giving tax breaks for a given year if opened on or before April 15th.

SEP IRA accounts usually have more options than 401(k)s, and they're much broader.

However, be aware that these additional benefits come at the cost of reduced flexibility in investing your money and possible trading fees compared to other types of investment products.

Pros and Cons of a SEP IRA

The SEP IRA has the following pros:

  • You can contribute more money than you can with a Solo 401(k).
  • There are no annual fees or opening fees for most firms
  • It is easier to set up than a Solo 401(k).

The SEP IRA has the following cons:

  • You are limited to investing in certain types of funds.
  • SEP IRAs have many of the same restrictions as regular IRA accounts.
  • If you withdraw money before reaching 59.5 years old, it will be taxed as ordinary income plus a 10% penalty for early withdrawal.
  • You will have to start paying required minimum distributions (RMDs) when you turn 70.5 which ensures that the government begins receiving taxes on your savings.

Which Should You Choose? SEP IRA vs Solo 401(k)

Deciding between a SEP IRA and Solo 401(k) will depend on your circumstances.

If you want to make large contributions, then the Solo 401(k) is for you because it offers more investment options than a SEP IRA.

However, this option has many additional rules that must be followed in order to contribute each year maximally.

If you don't want to make large contributions, then the SEP IRA is a better option because there are no annual contribution limits, and it is easier to set up than the Solo 401(k).

However, you will be limited to investing in certain types of funds.

Remember that both accounts offer tax breaks for contributing early, so decide which option is most beneficial for you.

SEP_IRA_vs._Solo_401(k) (1)

Final Thoughts

Both the solo 401(k) and SEP IRA are good accounts to save money in if you want a tax break or have a small business that qualifies as a sole proprietorship.

The Solo 401(k) will benefit those who make large contributions by being able to invest in a wider range of options, but it is more difficult to set up and follow the rules.

The SEP IRA is easier to set up and offers more flexibility than the solo 401(k), but you are limited to investing in certain types of funds.

Make sure you consult with a financial advisor to see which option is right for you.

Solo 401(k) vs SEP IRA FAQs

About the Author

True Tamplin, BSc, CEPF®

True Tamplin is a published author, public speaker, CEO of UpDigital, and founder of Finance Strategists.

True is a Certified Educator in Personal Finance (CEPF®), author of The Handy Financial Ratios Guide, a member of the Society for Advancing Business Editing and Writing, contributes to his financial education site, Finance Strategists, and has spoken to various financial communities such as the CFA Institute, as well as university students like his Alma mater, Biola University, where he received a bachelor of science in business and data analytics.

To learn more about True, visit his personal website or view his author profiles on Amazon, Nasdaq and Forbes.

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