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You are a resident, for U.S. federal tax purposes, if you are a Lawful Permanent Resident of the United States at any time during the calendar year. This is known as the "green card" test.
If you meet the green card test at anytime during the calendar year, but do not meet the substantial presence test for that year, your residency starting date is the first day on which you are present in the United States as a Lawful Permanent Resident. This would be the August date after Green Card received.
However, an alien who has been present in the United States at any time during a calendar year as a Lawful Permanent Resident may choose to be treated as a resident alien for the entire calendar year.
Was he here in the US in 2015? If he was not in the US for the time required to be a resident alien prior to getting the Green Card then he can claim dual status and not claim the interest. If he was in the US long enough then he has to report it.
You have to look at when he first came to the US and stayed.
A loan would not be reported.