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 How to Read Your Credit Report Solve a mystery while learning how important your credit report is with this story-driven interactive. Data Thieves from Outer Space Learn about the dangers of internet fraud with this highly educational and fun “pulp” comic. Comparing Mortgage Terms Estimate the total cost in today's dollars of various mortgage alternatives.