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 FIRE Retirement This short, informative article teaches the basics of the FIRE movement. Retirement Plan Detectives A couple become Retirement Plan Detectives, searching records from old employers. Deciding When to Take Social Security One of the most common questions people ask about Social Security is when they should start taking benefits.