I am sorry for your loss.
Since this interest income was earned after his passing and is more than $600, you would need to file an estate return to report this interest income.
IRS Form 1041, U.S. Income Tax Return for Estates and Trusts, is required if the estate generates more than $600 in annual gross income.
Click this link for more information - https://www.irs.gov/businesses/small-businesses-self-employed/deceased-taxpayers-filing-the-estate-i...
