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 Mutual Funds vs. ETFs Exchange-traded funds have some things in common with mutual funds, but there are differences, too. A Decision Not Made Is Still a Decision Investors who put off important investment decisions may face potential consequence to their future financial security. Where Will Your Retirement Money Come From? Retirement income may come from a variety of sources. Here's an overview of the six main sources.