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 How Will Working Affect Social Security Benefits? Knowing the rules may help you decide when to start benefits. Insurance Needs Assessment: Married With Children When you’re married and have children, insurance needs will be different. Questions to Ask About Medicare Take the guesswork out of your IEP or SEP with this helpful article.