Start to work in US since 02/01/2007 under L-1 visa. Before this, working in Taiwan from 07/01/2005, but frequently on business trips to US (less than 100 days in US).
For Y2007's tax, understand I need to report whole year income (including January's from Taiwan). How does this work together with Taiwan's tax return (in Y2007)? How about CA state tax?
P.s. I'm With UK Nationality, and residence (spouse and children) in Netherlands.