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 Question Thank you! Oops! Related Content Separating the Signal From the Noise A good professional provides important guidance and insight through the years. Retirement Plan Detectives A couple become Retirement Plan Detectives, searching records from old employers. The Fed and How It Got That Way Here is a quick history of the Federal Reserve and an overview of what it does.