I went to the US for a 6-month research internship (from August 2013 to February 2014), on a J1 Visa, without permission to work (I think the term is non-working J1 Visa). I lived in Atlanta, GA. I did not have a job nor had any income (besides a scholarship paid abroad and a small lease refund after I left my apartment).
I have been told I had to fill a tax form for both years (since I spent New Year's in the meantime), even if I hadn't any taxable income nor expect any refund.
The thing is, I filled my form late (on December 2014) for the first year, and haven't filled for the second one. (I'm sorry: I'm a disorderly person, and now that I'm back home, my daily duties simply made me postpone that). Now I have a double question for which I have found little, contradicting answers:
What are the consequences (in the US, of course) of not filling my (so-to-say empty) tax form? How may I still fix that?
Thanks in advance,