I'm a new immigrant (green card) to US, and not live in California yet. I use my friend's home in CA as the mailing address for receiving my letters, packages, and California ID. I plan to move to California and work there in US next year. I know California taxes on worldwide income, and I do not have any income source from California. So do I need to file tax return in California on my worldwide income or capital gain of 2014 in next year?