The most accurate Solo 401(k) calculator for self-employed individuals and small business owners. Powered by 2026 IRS limits.
⬇ Download on the App StoreSelf-Employed Retirement Planner
Up-to-date limits: $24,500 employee deferral + 25% employer profit sharing, combined max $72,000.
Age 50–59 & 64+: $8,000 catch-up. Age 60–63: $11,250 super catch-up contribution.
Supports both Schedule C net profit (×0.9235 IRS formula) and S-Corp W-2 wages.
Compare Traditional vs Roth 401k with federal tax savings, marginal & effective rate breakdown.
Side-by-side comparison of Solo 401k vs SEP-IRA vs SIMPLE IRA to find your best option.
Available in English, Chinese, Japanese, Korean, German, French, Spanish, and more.