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 Bridging the Confidence Gap In the world of finance, the effects of the "confidence gap" can be especially apparent. A Meal for All Generations When it comes to generational differences, knowing the facts can be difficult. 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.