New job in CA working remotely, live in IL

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Hello,

I have lived in IL for all of 2020. I started a new job in a CA-based company in the latter part of the year. However, I work remotely from IL and have not been to California at all for work. 

My W-2 from the company has both CA and IL listed and I have CA tax withheld.

I know I have to file a non-resident return for CA and a resident return for IL. My question:

Is any of my income last year attributed to California or is it all attributed to IL or part?

Would I have to pay any CA state taxes in addition to IL?

For reference: I haven't worked at all in CA in 2020.

[ErnieS0]

Your employer should not be withholding California income tax if you did not live or work in California. All your income is Illinois income because you lived and worked in IL.

File a nonresident CA return and enter $0 for your CA wages. You should receive all your withholding back. You may want to mail your CA return since your CA wages will not match the W-2. Attach a note explaining that you lived and worked in IL and that your employer withheld CA tax by mistake. Include a copy of your W-2 and your IL return showing you reported all your income to IL. If you mail this, send it by certified mail with proof of delivery so you will have a record that CA received your return.

Give your employer Form DE-4 and check Box 3 “I claim exemption from withholding for 2021, and I certify I meet both of the conditions for exemption”.

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Thank You, @ErnieS0! This is very helpful- really appreciate it.