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 Question Thank you! Oops! Related Content Social Security: Five Facts You Need to Know Here are five facts about Social Security that are important to keep in mind. Estimate Your RMD Help determine the required minimum distribution from an IRA or other qualified retirement plan. Please Leave Home Without It Concerns over identity theft continue to grow, especially with data breaches at major companies and financial institutions.