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So if I understand, for his individual it's 0, then for the estate I should calculate the amount of each payment I've received since his death that is not towards the principle?

It says on the 1099-INT not to put interest from seller-financed loans in there, should I just put it directly in the 1041 form as interest income?

And while I have you here, because I really do appreciate some feedback, when I distribute the estate within 2021 and the payments come to my bank account, would I again just put it in as interest income on my 1040 for next year's taxes?