If you are on J-1 visa, you are considered as a non resident in 2018 and 2019. Starting from January 1st, 2020, if you stay more than 183 days or meet the Substantial Presence Test SPT, you are considered as a resident.
If you are on H-1b visa, you will be considered as a resident for tax purposes if passing SPT starting from day one when you enter the US.
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