Solo 401(k) Calculator (2026)
Estimate solo 401(k) employee deferral, employer contribution and tax savings.
United States Calculator
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Move the sliders or type exact numbers. Results update instantly.
Instant Estimate
Your Results
Total Solo 401(k) Contribution
$59,000
Based on your selected solo 401(k) calculator assumptions. Try different sliders to compare scenarios.
Employer Contribution
$36,000
Estimated Tax Savings
$14,160
These calculations are financial projections and planning estimates, not tax, legal or licensed financial advice. 2026 IRS thresholds and mortgage lender rates vary by location.
How to Use the Solo 401(k) Calculator
Enter your initial figures
Input your primary values into the Solo 401(k) Calculator using the numeric fields or sliders.
Set your timeframe and rates
Configure interest rates, terms, contribution percentages, or tax assumptions.
Review instant calculations
Review the instant calculation breakdown to evaluate your financial planning scenario.
Formula & Calculation Methodology
Solo 401(k) Contribution = Employee deferral + employer profit-sharingThis calculator uses standard United States financial formulas, IRS thresholds, and amortization schedules. All results compute instantly in your browser with zero data stored or transmitted.
Calculation Examples & Scenarios
Baseline Planning Scenario
Standard United States planning inputs with default rates and values.
Key Benefits
- Instant, accurate estimates based on standard United States financial formulas
- Browser-based calculations with 100% data privacy and no signup required
- Scenario comparison by adjusting variables one at a time
Common Use Cases
- Monthly budgeting and goal planning for United States residents
- Comparing alternative financial decisions before committing funds
- Understanding the compound effect of rates and time horizons
Planning Guidance for Solo 401(k) Calculator
When making financial decisions involving solo 401(k) calculator, having accurate numbers is critical. Small changes in interest rates, contribution schedules, or fee structures can yield significant differences over time.
Use this calculator to test conservative and optimistic scenarios before signing contracts or reallocating investment capital. Review current local guidelines and speak with a qualified advisor for personalized strategies.
Frequently Asked Questions
For 2026, the combined Solo 401(k) limit is $70,000 (or $77,500+ with age 50+ catch-up), composed of up to $23,500 in employee salary deferral plus up to 25% employer profit sharing.
You must have self-employment business income and zero full-time W-2 employees other than yourself and your spouse.
Yes. If your spouse earns legitimate compensation from the business, they can contribute their own employee deferral ($23,500) plus employer profit sharing, potentially doubling household contributions to $140,000+.
Yes. Unlike traditional SEP IRAs, Solo 401(k) plans can be structured to accept designated Roth employee salary deferrals, allowing massive tax-free retirement accumulation.
Yes. Most Solo 401(k) plan documents permit participant loans up to 50% of the total account balance or a maximum of $50,000, repaid with interest back to your own account.
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