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 Are Alternative Investments Right for You? With alternative investments, it’s critical to sort through the complexity. Money that Buys Good Health is Never Ill Spent It's important to make sure your retirement strategy anticipates health-care expenses. Social Security: Maximizing Benefits There are other ways to maximize Social Security benefits, in addition to waiting to claim them.