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. Related Content The Power of Compound Interest Learn how to harness the power of compound interest for your investments. Extended Care: A Patchwork of Possibilities What is your plan for health care during retirement? How to Read Your Credit Report Solve a mystery while learning how important your credit report is with this story-driven interactive.