How Much Can S-Corp Business Owners Contribute To a Solo 401(k) in 2026?
- May 5
- 4 min read
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For many small business owners in Tampa, FL, understanding how to maximize retirement savings is a key part of financial planning. If you run an S-Corporation and want to contribute to a Solo 401(k), knowing the contribution limits and rules for 2026 can help you make the most of your retirement account. This guide breaks down how Solo 401(k) contributions work for S-Corp owners, explains the difference between employee and employer contributions, and clarifies how your W-2 salary affects your retirement savings. Use the free Advanced Retirement Calculator here.
Solo 401(k) Contribution Limits for 2026
The IRS sets annual limits on how much you can contribute to a Solo 401(k). These limits are designed to help you save aggressively for retirement while staying within tax rules.
Here are the key 2026 limits for Solo 401(k) contributions:
Employee Elective Deferral: Up to $24,500. This can be made as pre-tax or Roth contributions.
Employer Nonelective Contribution: Up to 25% of your net self-employment income.
Total Maximum Contribution (Under Age 50): $72,000.
Catch-up Contribution (Ages 50–59 and 64+): Additional $8,000 allowed, making the total $80,000.
Enhanced Catch-up Contribution (Ages 60–63): Up to $11,250 extra, for a total of $83,250.
The employee deferral limit is capped at 100% of your compensation, but no more than $24,500. Employer contributions are calculated based on your net earnings from self-employment, which for S-Corp owners is tied to your W-2 salary. Use the free 401(k) calculator to gameplan your contirbutions.
How Solo 401(k) Contributions Work for S-Corp Owners
If you own an S-Corporation, your Solo 401(k) contributions depend largely on your W-2 wages from the company. Unlike sole proprietors or LLC owners who calculate contributions based on net self-employment income, S-Corp owners must pay themselves a reasonable salary, reported on a W-2, to qualify for contributions.
Employee Contributions come from your W-2 wages. You can defer up to $24,500 of your salary into the Solo 401(k).
Employer Contributions are made by the S-Corp itself and can be up to 25% of your W-2 wages.
This structure means your total Solo 401(k) contribution depends on how much salary you pay yourself through the S-Corp. The higher your W-2 wages, the more you can contribute.
Employee vs Employer Contributions Explained
Understanding the difference between employee and employer contributions is crucial for maximizing your Solo 401(k).
Employee Contributions
These are elective deferrals you choose to make from your paycheck. You decide how much to contribute, up to the IRS limit of $24,500 in 2026. You can make these contributions on a pre-tax basis (traditional Solo 401(k)) or as Roth contributions (after-tax).
Employer Contributions
The S-Corp makes these contributions on your behalf. They are calculated as a percentage of your W-2 wages, up to 25%. Employer contributions are always pre-tax and reduce your taxable income.
Both types of contributions add up to your total Solo 401(k) contribution for the year. The combined total cannot exceed $72,000 for those under 50, or higher limits if you qualify for catch-up contributions.
The Relationship Between W-2 Salary and Retirement Contributions
Your W-2 salary from the S-Corp directly impacts how much you can contribute to your Solo 401(k). Here’s why:
Employee deferrals are limited to the amount of your W-2 wages. You cannot defer more than you earn.
Employer contributions are based on a percentage of your W-2 wages, so a higher salary means a higher potential employer contribution.
This means setting a reasonable salary is important. Paying yourself too low a salary limits your retirement contributions. Paying too high a salary may increase your payroll taxes but allows for larger retirement savings.
Example Scenarios
Scenario 1: Owner Under 50 with $100,000 W-2 Salary
Employee elective deferral: $24,500 (maximum allowed)
Employer contribution: 25% of $100,000 = $25,000
Total contribution: $24,500 + $25,000 = $49,500
In this case, the owner can contribute $49,500 to their Solo 401(k) for 2026. This is below the $72,000 maximum because the employer contribution is limited by the 25% of salary rule.
Scenario 2: Owner Age 52 with $150,000 W-2 Salary
Employee elective deferral: $24,500 + $8,000 catch-up = $32,500
Employer contribution: 25% of $150,000 = $37,500
Total contribution: $32,500 + $37,500 = $70,000
Here, the owner benefits from the catch-up contribution, allowing a higher total contribution. The total is still under the $80,000 maximum for ages 50–59.
Frequently Asked Questions for Small Business Owners
1. Can I contribute to a Solo 401(k) if I have employees?
If you have employees other than your spouse, you may not qualify for a Solo 401(k). Solo 401(k)s are designed for business owners with no full-time employees.
2. How do I determine a reasonable salary for my S-Corp?
A reasonable salary reflects what you would pay someone else to do your job. It should be based on industry standards, your experience, and business profits.
3. Can I make Roth contributions to my Solo 401(k)?
Yes, you can choose to make employee elective deferrals as Roth contributions, which grow tax-free.
4. What happens if I exceed the contribution limits?
Excess contributions may be subject to penalties and taxes. It’s important to track contributions carefully and correct any excess with your plan administrator.
5. How often can I contribute to my Solo 401(k)?
You can make employee deferrals throughout the year, typically through payroll deductions. Employer contributions are usually made by the business’s tax filing deadline.
6. Does my age affect contribution limits?
Yes, if you are 50 or older, you can make catch-up contributions, increasing your total allowable contribution.
7. How does Tampa, FL local tax law affect my Solo 401(k)?
Florida does not have a state income tax, so your Solo 401(k) contributions are not subject to state income tax, which can increase your overall tax savings.
If you want to explore how to optimize your Solo 401(k) contributions or need help with bookkeeping and accounting tailored to Tampa small businesses, the Stronghold Accounting CPASystem™ can provide unlimited guidance for a weekly subscription.
Written by: Alex M. Riccio, CPA | Stronghold Accounting
