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 Understanding Equity Compensation Net Unrealized Appreciation and how it affects tax responsibilities. Women on the Rise Explore the growing influence women wield over the economy with this handy 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.