The California Franchise Tax Board (FTB) can come after snowbirds and other people who spend time in California, but maintain a tax residence in other states. For California income tax purposes, nonresidents are only taxed on income earned from California sources. Residents, on the other hand, are taxed on all of their income, even if it was earned outside of California, and even if it was earned outside of the country.
The difference between having a status as a California tax resident or nonresident can therefore amount to tens of thousands of dollars in potential tax liability, and tens of thousands of dollars in additional revenue to The Golden State. The general definition of a resident is an individual who is present in California for other than a transitory or temporary purpose, or someone who is domiciled in California, but it located outside of California other than for a transitory or temporary purpose.
The term “domicile” means the place where you voluntarily establish yourself and family, not merely for a special or limited purpose, but with a present intention of making it your true, fixed, permanent home and principal establishment. Determining whether a visit is temporary or transitory depends on the purpose and length of the visit.