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 9 Facts About Social Security There are things about Social Security that might surprise you. Inflation & Your Money It's important to understand how inflation is reported and how it can affect investments. From Boats to Brokers From the Dutch East India Company to Wall Street, the stock market has a long and storied history.