Do I send W-7 with federal tax return or with state tax return of both?

Hi, I'm from France and I moved to Los Angeles almost 7 month ago, therefore, that's the first time I have to fill a tax return here. My husband is still in France for his work 'til the end of May. In order to fill my taxes return, I need to ask for a ITIN for him. I filled the W-7 on his behalf, but my question is: Do I send it with my federal tax return, with my state tax return or with both?

Thank you for your help