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Solo 401(k) vs SEP IRA Calculator

Compare contribution limits, tax savings, and retirement projections between Solo 401(k) and SEP IRA for self-employed individuals.

Personal Finance · Reviewed by FreeCalculators Editorial · Updated 2026-09-01

How it works

The Solo 401(k) vs SEP IRA Calculator is designed for self-employed individuals who want to analyze the benefits of two popular retirement savings options. Both the Solo 401(k) and the SEP IRA have distinct contribution limits and tax implications that can significantly impact your retirement savings. For example, with a self-employment income of $150,000 and a tax rate of 24%, the calculator determines the maximum contributions allowed for both accounts. In this scenario, the Solo 401(k) permits contributions up to $61,000, which includes both employee deferrals and employer contributions, while the SEP IRA allows for a maximum contribution of $28,500. To illustrate, if you contribute the maximum amount to a Solo 401(k), your total contributions could potentially grow to approximately $2,400,000 by the time you retire, assuming an annual return of 7% over 20 years. In contrast, the SEP IRA contributions may grow to around $1,200,000 under the same conditions. This stark difference in projected savings underscores the importance of selecting the right retirement plan based on your financial situation and long-term goals. Interpreting the primary output of the calculator is straightforward. It provides not only the maximum contribution limits for each plan but also estimates your potential tax savings based on your contributions. For instance, contributing $61,000 to a Solo 401(k) could save you $14,640 in taxes, while a $28,500 contribution to a SEP IRA might save you $6,840. Understanding these figures can help you make informed decisions about your retirement strategy. A common mistake people make is underestimating their future income or contribution limits. If your income fluctuates significantly, you might find that a SEP IRA offers more flexibility in contribution amounts. It's crucial to consider your income stability and future financial plans when deciding between these two retirement accounts.

Tips

  • Consider your income stability; higher income may favor the Solo 401(k) due to its higher contribution limits.
  • Evaluate your current and future tax situations; Solo 401(k) contributions can reduce your taxable income significantly.
  • Factor in your investment strategy; both plans allow for various investment options, so choose one that aligns with your risk tolerance.
  • Plan for changes in income; if you expect fluctuations, a SEP IRA may offer more flexibility in contribution amounts.

Frequently asked questions

What is the maximum contribution for a Solo 401(k)?
For 2023, the maximum contribution for a Solo 401(k) is $61,000, or $67,500 if you are age 50 or older.
What is the maximum contribution for a SEP IRA?
The maximum contribution for a SEP IRA in 2023 is 25% of your compensation, up to a limit of $66,000.
How does tax savings differ between Solo 401(k) and SEP IRA?
Tax savings depend on your contributions; for example, contributing $61,000 to a Solo 401(k) at a 24% tax rate saves you $14,640 in taxes, compared to $6,840 for a SEP IRA contribution of $28,500.
What are the projected retirement savings for both plans?
With a 7% annual return over 20 years, a Solo 401(k) contribution could grow to approximately $2,400,000, while a SEP IRA could grow to about $1,200,000.