Nobody needs reminding that California is a high income tax state. Most people know there can be tax benefits from changing residency or maintaining nonresidency status where California is involved. With a top bracket rate of 13.3%, California residency at the time of a large capital gains event (such as a startup sale or IPO, for instance), can result in millions of dollars of state income taxes, while across the border in Nevada, the tax would be zero. But details matter. The amount of tax savings, if any, achievable through strategic residency tax planning depends on various moving parts: sources of income, types of compensation, connections people want to or must maintain with California, community property rules (for married couples), the cost and inconvenience of acquiring nonresident status, to name a few. The refrain found everywhere on the internet that huge tax savings beckon every resident to flee the state is simplistic at best. Accordingly, considerable forethought, usually with CPA assistance, is advisable before committing to a residency plan. This article discusses why.
How California Taxes Residents vs. Nonresidents
First the basics.
California residents are subject to California state income tax on all their taxable income regardless of the source. It doesn’t matter if the income comes from the moon, if it is taxable, then California tax system claims jurisdiction. It’s possible a California resident to qualify for a credit for taxes paid in another state for out-of-state income, and some income types are exempt on their face in California (such as social security retirement benefits), but the default rule remains: a resident’s worldwide income is subject to California income tax. Period.