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 Understanding Marginal Income Tax Brackets An inside look at how marginal income tax brackets work. Perception vs. Reality There’s an alarming difference between perception and reality for current and future retirees. Preparing for the Expected You can plan ahead to protect yourself and your family against the financial consequences of deteriorating health.