for 2018, you are indeed a Resident Alien for Tax purposes and because there is no tax treaty between US and Saudi Arabia ( No income tax in SA ), you are pretty much like any other student in the USA. You will need a tax id to file the return. You will not have to pay the FICA taxes ( Social Security & Medicare ) because you are on F-1. So you have to prepare your return using TubroTax -- use a dummy SSN like 99-998-8000 to satisfy the software. PRINT the return, sign and date, snopake out the dummy SSN entered and hand write "NRA". Now download the W-7 form and instructions from the <a rel="nofollow" target="_blank" href="
http://www.irs.gov">www.irs.gov</a> site, fill it out, include copies of all the documents it asks for. sign and date as required. Mail the whole thing in along with and check if you owe amounts . This will result in human intervention and the issuance of ITIN retrospectively for the year 2018.
Good Luck
