I take it your brokerage account is a manual (offline) account and you are not downloading from the brokerage. Is this correct?
If you are downloading, the brokerage should have downloaded a security for the CD and then be downloading transactions to account for interest that is actually paid out prior to maturity. Usually these interest transactions will be deposited to the cash balance (or the "sweep account") of that brokerage account because interest paid out prior to maturity does not change the value of the CD.
CDs that do not pay out interest until the maturity date: On the maturity date there will likely be 2 transactions downloaded…one returning the amount of the origianal purchase price and one that is an interest payment (again, deposited to the brokerage account).
Also, downloaded brokered CDs will have a market value so while the CD is held and prior to maturity the brokerage will download the current market value of the CD.
If you are manually managing the account and these are brokered CDs (these are the kind that brokerages usually sell): It is best to follow the practice of the brokerage.
If you wish to manaully do something different from how the brokerage manages it: I have never seen a CD (and I have a number of them) with a reinvested income transaction that increases the value of the CD. But if you want to do this you could:
Questions? Comments?
Adding monthly interest as just interest, just adds cash to the account and does not increase the value of individual CD.
This is correct behavior. The value of the CD does not increase due to interest payments. It's not a reinvestment.
I have never seen a CD (and I have a number of them) with a reinvested income transaction that increases the value of the CD.
Neither have I. I think you're over-thinking this, @bruciebabe .