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 From Boats to Brokers From the Dutch East India Company to Wall Street, the stock market has a long and storied history. Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable. A Look at Whole Life Insurance Whole life insurance remains in force as long as you remain current with premiums. Here's how it works.