For the 3-year CD that won't automatically renew, you only have to send a notice (under Reg. DD §
230.5(c)) of the maturity date and whether interest will continue to be paid after maturity. This notice has to go out at least 10 days before maturity.
If the 3-year CD will automatically renew, §230.5(b) applies. The notice goes out 30 days before maturity (but if there is a grace period, 20 days before the end of the grace period). The notice has to include (on or with the notice) all of the information disclosed for a new account of the term for which the account would be renewed, plus the maturity date. If the interest rate and APY for the renewed term are unknown, the notice needs to include the date by which the rates will be known, and a telephone number the customer can call to learn the interest rate and APY.
There is no need for an annual notice under Regulation DD. The only annual notice for a 3-year CD is the 1099-INT.