@adi47 since you entered the USA with F-1 in 2018, and assuming that there are no other contravening situations, you are an exempt person ( from counting days present in the USA towards SPT) through 12/31/2022. So you filed 1040-NR and form 8843 ( explaining the basis of your excluding days present in the USA ) each and every year when you had earnings to report ( from US sources ).
Since there was a immigration status change in Oct of 2021, your "Exempt" status would have been terminated with the change of visa status, even if you were still a student. In your particular case, you changed to H1-B from F-1 on xx/October /2021. Thus you start counting days present in the USA from the first day present after Visa change. Thus , and if you choose to file a form 1040-NR ( as a Non-Resident Alien ), form 8843 should be submitted covering the period 01/01/2021 through 09/30/2021 ( or the day after when the change in visa status took place ).
Does this make sense ?
Is there more I can do for you ?
