Say my father invested 'x' amount of rupees in REC 54 EC bond in 2020. He was the first holder and I was the second holder. There were no other joint holders. My father used to get 'y' amount of interest per year from the said bond and this amount used to get credited in his own bank account (my mother was joint holder in this bank account). My father died in December 2023. Now, if I perform transmission of the said bond in my own name and own bank account number, it is clear that from now onwards, the aforementioned 'y' amount of interest from the bond will start getting credited in my own bank account and I have to pay income tax on that. My question is: On maturity, when the invested principal amount will get credited to my own bank account, will I have to pay income tax on this principal amount?