Solo 401(k) Calculator
Calculate your maximum Solo 401(k) contribution limits for 2025
As a self-employed individual, you can contribute to your Solo 401(k) in two ways: as both an employee and an employer. For 2025, you can contribute up to $23,500 as an employee across ALL your 401(k) accounts combined - this includes both traditional employer 401(k)s and your Solo 401(k). For example, if you've already contributed $15,000 to your day job's 401(k), you can only contribute $8,500 as an employee to your Solo 401(k).
On top of your employee contribution, you can also make employer contributions of up to 25% of your net self-employment earnings (your business income minus half of your self-employment tax and your business expenses). This employer contribution is completely separate from your employee contribution limit, allowing you to potentially save significantly more for retirement.
The calculator factors in your self-employment tax (15.3% of net earnings) when determining your maximum contribution limits, as this affects your net income and thus your employer contribution capacity. The total combined limit for both employee and employer contributions for 2025 is $70,000 (or $77,500 if you're 50 or older).
Your Information
Your total business revenue before expenses
Total deductible business expenses
Your Results
$0
Your business income after expenses and SE tax deduction
$0
Maximum available for any 401(k)s (solo and w2 combined) after IRA contributions + se tax deduction
$0
Your maximum employee contribution (reduced by any W2 401k contributions)
$0
Maximum employer contribution (adjusted for SE tax)
$0
Combined employee and employer contributions
Pro Tip: Maximize Your Contributions
Consider establishing your Solo 401(k) through Solo401k.com to access additional benefits like Roth options, checkbook control, and the ability to invest in alternative assets like real estate.
Important Notes
- • The 2025 employee contribution limit is $23,500 ($31,000 if age 50 or older)
- • Employer contributions are limited to 25% of net business income after self-employment tax deduction
- • Total contributions cannot exceed $70,000 ($77,500 if age 50 or older) for 2025
- • Total retirement contributions (IRA + Solo 401k) cannot exceed your earned income
- • The 2025 IRA contribution limit is $7,000 ($8,000 if age 50 or older)
- • W2 401(k) contributions reduce your available employee contribution limit
- • You must have a Solo 401(k) plan established before making contributions
- • This calculator is for educational purposes only - consult a tax professional for specific advice
Need help calculating your business expenses?
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Solo 401(k) Calculator for Self-Employed Individuals
Calculate your maximum Solo 401(k) contribution as a self-employed individual or small business owner. For 2024, you can contribute up to $69,000 ($76,500 if age 50+) combining employee deferrals ($23,000) and employer profit-sharing contributions (up to 25% of net self-employment income). Solo 401(k) plans, also known as Individual 401(k) or Self-Employed 401(k), offer the highest contribution limits of any retirement account for freelancers and independent contractors.