A high interest rate CD may come from a several different, and perhaps non-conventional, sources. The Certificate of Deposit markets have evolved, much like other financial arrangements, with today’s fast transactions and instant access to information via the Internet. Today, a Certificate of Deposit can be purchased from independent agencies, brokerage firms, and deposit brokers. In days gone by, these investments were only offered through the traditional local banking institution. And, with the changes, getting the highest CD interest rates have become more complex which is where a CD rate interest calculator comes in. The percentage gained through the maturity of a CD is largely dependent upon the type of deposit and the features offered. A review of investment strategies and a look into how the market has changed will help investors know which avenue to journey when considering financial investments