@ruby25zgheng , Should I assume that you are a US person ( citizen / GreenCard ) ?
Generally CA taxes both Non-Resident ( on California sourced income ) and Residents ( on world income).
Unlike some other states CA does not use a number of days present to determine residency -- instead it uses a number of factors to determine of one is resident ( domiciled ) ---- I would refer you to FTB instructions/discussions -- see page 5 of this --->
2023 FTB Publication 1031 Guidelines for Determining Resident Status
If I assume that you were never a CA resident and just came to the US / CA and stayed here from Jan through May of 2023 , worked / trained . and then went back to your home country ( China ) then your period of stay may qualify you for being a Non-Resident. This would mean that you will pay CA taxes ONKLY for the period that you lived and worked in CA.
There is also a possibility that you were a resident of CA and then took a job abroad, then you are a resident for the first part of the year and then a Non-Resident for the rest of the year -- the referred document also covers this case.
Is there more I can do for you ?
