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I should have been more clear on this point - I'm assuming and pretty certain my father did not report any interest during his lifetime.  My confusion comes in because one is supposed to report the interest when either of the following happens: One redeems the bond OR it reaches final maturity - whichever comes first.  Because it reached final maturity in 2016 it follows that I should have reported it then - but I didn't know it existed until now.  I guess the question is: Can I reasonably expect to get away with reporting the interest this year when I'll receive the 1099?