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 Tuning Your Social Security Benefit When should you take your Social Security benefit? Earnings for All Seasons Earnings season can move markets. What is it and why is it important? Three Key Questions to Answer Before Taking Social Security When to start? Should I continue to work? How can I maximize my benefit?