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 The Sequence of Returns A look at how variable rates of return impact investors over time. Bull and Bear Go To Market Learn about the difference between bulls and bears—markets, that is! What's New for Social Security? There have been a number of changes to Social Security that may affect you, especially if you are nearing retirement.