State tax on the gain
California taxes capital gains as ordinary income — no discounted rate — with brackets reaching 13.3% at the top. On a large gain, the state layer alone can approach half the size of the federal bill, which makes deferral proportionally more valuable in California than almost anywhere else.
Does California recognize 1031 deferral?
Yes. California generally conforms to Section 1031 for real property, so a valid federal exchange defers California tax too. The state's caveat isn't whether you can defer — it's how carefully it tracks the deferred gain afterward.
Withholding at closing
California normally requires 3⅓% of the sale price withheld at closing on investment property sales. In a 1031 exchange, you can claim an exemption from withholding on Form 593 by certifying the sale is part of an exchange — your escrow officer handles the form, but you need to flag the exchange before closing. If the exchange later fails or produces boot, withholding applies to the taxable portion.
Exchanging into another state
This is the famous one. Exchange California property into another state, and California asserts that the deferred gain remains California-source income forever. You must file Form 3840 with the state every single year you hold the replacement property — miss the filing and the Franchise Tax Board can assess the deferred tax immediately. When you eventually sell in a taxable sale, even decades later in Texas, California expects its share of the originally deferred gain.
State tax rules change and have exceptions this page can't cover. Confirm current rates and filing requirements with a tax professional licensed in California.