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 Investments You’ve made investments your whole life. Work with us to help make the most of them. Earnings for All Seasons Earnings season can move markets. What is it and why is it important? Estimating the Cost of College This worksheet can help you estimate the costs of a four-year college program.