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 Where Is the Market Headed? We all know the stock market can be unpredictable. We all want to know, “What’s next for the financial markets?” Retirement Redefined Around the country, attitudes about retirement are shifting. Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one.