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 Data Thieves from Outer Space Learn about the dangers of internet fraud with this highly educational and fun “pulp” comic. A Bucket Plan to Go with Your Bucket List A bucket plan can help you be better prepared for a comfortable retirement. Retirement Traps to Avoid Beware of these traps that could upend your retirement.