Unless you take steps to establish legal residency in another state (or country), you remain a legal resident of CA and are subject to CA state tax on all your income (wherever it is earned).
What makes you a legal resident of a state (or country)?
Generally, you're a resident of a state (or country) if you intend to either stay there permanently, or return there after a temporary absence. It's where home is – where you come back to after being away on vacation, business trip, overseas or out-of-state employment, or school. Many factors are considered, not the least of which are where you are registered to vote, own homestead property and are licensed to drive.
