Son out of state at school and has W-2

[dhoydic]

My son and I are Michigan residents, but he went to school in California for 2018, and I have 2 W-2's from California.  Do I need to file state taxes in CA or Michigan?

[TomK]

Yes, you will have to file both.  

You have California source income.

https://www.ftb.ca.gov/individuals/FileRtn/index.shtml

You must file a Michigan return if you file a federal return or your income exceeds your Michigan exemption allowance. A return must be filed even if you do not owe Michigan tax.

https://www.michigan.gov/taxes/0,4676,7-238-75545_43715-153718--,00.html