Self-Employed Retirement Plans Estimate the maximum contribution amount for a Self-Employed 401(k), SIMPLE IRA, or SEP. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content All Muni Bonds Are Not Created Equal Gaining a better understanding of municipal bonds makes more sense than ever. Leaving Your Lasting Legacy Want to do more with your wealth? You might want to consider creating a charitable foundation. Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax.