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 Stocks Work Understanding how a stock works is key to understanding your investments. Eight Mistakes That Can Upend Your Retirement There are common mistakes you can avoid when saving for retirement. Understanding Equity Compensation Net Unrealized Appreciation and how it affects tax responsibilities.