Primary purpose of this article is to Explain how a Certificate of Deposit Works. How a certificate of deposit works starts using a bank institution or credit union offering you CD quotations that present the amount percentage yield is estimated annually. If you deposit your cash for a certain time frame, there is an expected fixed rate for getting. You must understand that a Certificate of Deposit is a time deposit that is somehow comparable to savings account except that you’re covered by the Fed Deposit Insurance Corporation (FDAC) or even National Credit Union Administration (NCUA) for anyone who is dealing with bank company and credit union, respectively.