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 Question Thank you! Oops! Related Content Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process. Succeeding at Business Succession There are a number of reasons for business owners to consider a business succession plan sooner rather than later. The Fed and How It Got That Way Here is a quick history of the Federal Reserve and an overview of what it does.