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. Related Content How to Conquer the World - 5 Financial Strategies for Savvy Learn more about women taking control of their finances with this infographic. Important Birthdays Over 50 Here's a look at several birthdays and “half-birthdays” that have implications regarding your retirement income. Finding the Balance The sandwich generation faces unique challenges. For many, meeting needs is a matter of finding a balance.