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 Question Thank you! Oops! Related Content Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card. 9 Facts About Retirement Regardless of how you approach retirement, there are some things about it that might surprise you. A Decision Not Made Is Still a Decision Investors who put off important investment decisions may face potential consequence to their future financial security.