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 Retirement Redefined Around the country, attitudes about retirement are shifting. How to Make the Tax Code Work for You When you take the time to learn more about how it works, you may be able to put the tax code to work for you. How Will Working Affect Social Security Benefits? Knowing the rules may help you decide when to start benefits.