As of 2015, Key Bank offers 0.10 percent on its six-month certificates of deposit, according to the company. The national average for six-month CDs during the same time period is 0.17 percent, states Bankrate.
A short-term certificate of deposit allows anyone who purchased the security instrument to receive interest up to a specific maturity date, states Investopedia. If the maturity date is six months from the date of purchase, the bearer receives six months of fixed-rate interest when the CD expires. However, holders of CDs cannot withdraw any funds from the CD until the maturity date, and any early withdrawal causes holders to forfeit any interest earned.