I need to file my taxes as a Non Resident Alien, but I pass the substantial presence test, as I arrived in the US in 2012 on a F1 visa. I filed as a non resident for the years 2012–2016. I am presently still on my F1 visa (OPT) and working.
My company did not withhold FICA taxes on the assumption I am Non-Resident Alien. However, when I started filing my taxes, I realized I am considered Tax resident as I have crossed 5 calendar years in the US.
Under these circumstances, I want to file 1040NR-EZ under the "The Closer Connection Exception to the Substantial Presence Test for Foreign Students" rule of the IRS.
So to file as Non Resident Alien, do I just need to attach form 8843, or do I need to attach any other documents as well?