@pagenplant , based on your post - (a) your exempt period lasts from 2016 through 2020 and therefore absent any change of status you would be Non-Resident Alien; (b) your status change was affected on 10/01/2019 and therefore your exempt status ended on that date --- you start counting days towards substantial presence test; (c) during 2019 you had only 92 days of countable presence and therefore you would still be Non-Resident Alien for 2019 and file a form 1040-NR.
If you do have the option of requesting to be treated as a resident for 2019 ( it may or may not help you taxwise though ) --- if you meet (1) you were not a Resident/ Resident for Tax purposes in 2018 ; (2) for the test period of 10/01/2019 you have been present in the USA for at least 31 days and you you were present for at least 75% of the days in the test period and (3) you will meet the substantial presence test in 2020. I think based on your post you would qualify. However you cannot request this treatment till you have met the substantial Presence Test in 2020.
Does this help or do you need more help ?
