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. Volunteering in Retirement For many, retirement includes contributing their time and talents to an organization in need. The Most Overlooked Item of Any Home Improvement The item most homeowners forget on their home improvement project checklist is insurance.