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 Avoiding Cognitive Decline Try these activities to keep your brain sharp. Protection Against Uninsured Drivers You’re hit by an uninsured driver. Now what? Are you protected against financial losses? When Should You Take Social Security Monthly Social Security payments differ substantially depending on when you start receiving benefits.