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 Earnings for All Seasons Earnings season can move markets. What is it and why is it important? How Big is Money? Learn a little about worldwide currency in this fun infographic 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.