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 Comparing Mortgage Terms Estimate the total cost in today's dollars of various mortgage alternatives. When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Preparing for the Expected You can plan ahead to protect yourself and your family against the financial consequences of deteriorating health.