Thank you very much for your response!
(a) I was a J-1 student from 2019-2021. After graduating, I returned to Germany and obtained an F-1 visa. I started my new program on F-1 in 2021 and that has been my status since.
(b) I have a research assistantship on campus and get paid for working under my advisor. In the summer of 2024, I completed an internship off campus under CPT.
(c) Nothing was adjusted at the end of 2023. The software my university uses for foreign student tax compliance just notified me that my status will switch to resident alien for tax purposes. After looking into it, I am aware that I can continue to be treated as a non-resident alien if I proof certain facts to the IRS. However, I do not know how easy that will be and I generally do not have an issue with being taxed as a resident. So that is not an avenue I was considering.
(d) The reason for my leaving was that I visited my family in Germany over Christmas/New Year's.
(e) I am still in the US as an F-1 student.
