You have two options. As you first entered the US in 2012, if you lived in the US in both 2015 and 2016, you are considered as a US resident for tax purposes for the entire calendar year of 2017 by meeting the Substantial Presence Test SPT. You will be filing a Form 1040. However, you can claim to be a dual-status alien for 2017 if you meet the following conditions:
- You are not a U.S. resident during any part of the following year (2018) and
- You establish that, after you left the U.S., your tax home was a foreign country and you had a closer connection to that country.
For more information about dual-status alien, please see Last Year Residency- under Year of Departure
