If you meet the green card test and have a Social Security number, you are to file an IRS Form 1040 tax return.
IRS Topic No 851 Resident and Nonresident Aliens states:
Resident Aliens
You're considered a resident alien for a calendar year if you meet the green card test or the substantial presence test for the year.
Green Card Test
You're considered to have met the green card test, and are therefore a resident alien, if at any time during the calendar year you are a lawful permanent resident of the United States according to the immigration laws, and this status hasn't been revoked or administratively or judicially determined to have been abandoned.
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