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 The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. The Lowdown on Those Free Credit Scores What’s the deal with your yearly free credit report? Medicare At 65+ 65 or older? It may be time to enroll in Medicare. Read to learn if you’re eligible.