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 Navigating Retirement Pitfalls Why are they made again and again? Making sense of these errors in judgement. The Fed and How It Got That Way Here is a quick history of the Federal Reserve and an overview of what it does. Estimate Your RMD Help determine the required minimum distribution from an IRA or other qualified retirement plan.