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 Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process. What is the Value of Your Business? Ascertaining the value of your business is important for a variety of reasons. How to Appeal Your Property Taxes For homeowners who think their property taxes are too high, there are ways to appeal.