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 Forecast This short video helps explain why markets can be as unpredictable as the weather. How Big is Money? Learn a little about worldwide currency in this fun infographic Retirement Questions That Have Nothing to Do With Money Things to consider before retirement.