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 Retiring Wild: National Parks and You Get ready to enjoy America’s national park system with this helpful article. How Income Taxes Work A quick look at how federal income taxes work. How to Effectively Budget as a Couple Be sure that you agree on how to go about combining your finances as a couple before discussing how you'll handle expenses.