Since the decedent's final tax return has been filed, and it appears the interest and dividends were earned after death report the 1099-INT and 1099-DIV on Form 1041 for estates and trusts if the estate received the income. If the income was directly distributed to beneficiaries, they report it on their personal returns. See the Instructions for Form 1041 and TurboTax's Death in the Family article for more details. The estate will likely have to give a K-1 to each beneficiary. Instructions for Schedule K-1 beneficiary filing can be found here
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