Picture the investor who did everything by the book. Sold a rental in San Diego, ran a clean 1031 exchange, and rolled the gain into a larger property in Texas, a state with no income tax. They moved to Texas too. As far as they are concerned, they have left California, and California's tax, firmly in the rearview mirror.
They have not. California is still tracking that deferred gain, still expects a form from them every single year, and will still send a bill when they eventually sell the Texas property. This is the California clawback, and it surprises more out-of-state exchangers than almost any other rule we deal with.
What the clawback actually does
When you exchange California real estate into a replacement property located outside California, the state does not forgive the gain that built up while the property sat in California. It defers it, like the federal government does, but it never lets go of its claim. The California-source portion of your gain stays on California's books, and when you finally recognize that gain, in a later taxable sale, California taxes it. It does not matter that you now live in Florida or Texas. It does not matter that the property you sell is in another state. The gain originated in California, so California's claim follows the gain wherever it goes.
That is the whole idea in one sentence: the gain leaves the state, but California's right to tax it does not.
The form you'll be filing for years: FTB 3840
California enforces this through an annual information return, FTB Form 3840, "California Like-Kind Exchanges." Here is what catches people off guard about it:
- You file it every year. Not once. Every year that the deferred California gain remains deferred, Form 3840 is due, tracking that gain for the Franchise Tax Board.
- It applies whether or not you're a California resident. Residents and nonresidents alike must file if they exchanged California property into an out-of-state replacement.
- You file it even when you file nothing else in California. This is the real trap. An investor who moved away and no longer has any California filing obligation for any other reason still has to file Form 3840, year after year, purely to keep the deferred gain reported.
Miss it, and the FTB can estimate the deferred gain and assess the tax on its own terms, which is never the terms you would have chosen. Keeping the annual filing current is not optional housekeeping; it is how you keep control of your own number.
A rough sense of what's at stake
Say your California property carried $600,000 of deferred California-source gain when you exchanged out of state. Every year, Form 3840 keeps that $600,000 on California's radar. Years later, when you sell the out-of-state replacement in a taxable sale, California taxes its share of that gain at rates that can reach the low double digits as a percentage, entirely separate from the federal and destination-state tax you will also owe. On a large gain, the California slice alone can run well into six figures. Your CPA determines the exact figure; the point is that it is real money, and it does not evaporate just because you crossed a state line.
When the clawback quietly disappears
There is a genuinely good ending to this story, and it is the same one we describe in swap 'til you drop. The clawback bites when the gain is recognized in a taxable sale. If you never take that taxable sale, if you keep exchanging, or hold the replacement property until death, the step-up in basis your heirs receive can eliminate the deferred gain, and California's clawed-back claim generally goes with it. Defer, keep filing the 3840, and let the step-up do its work, and the California gain can resolve the same way the federal gain does: not with a check, but with a reset. As always, your CPA and estate attorney determine how this applies to you.
California isn't the only one, but it's the loudest
A handful of other states run their own versions of gain-tracking or clawback rules for like-kind exchanges. California is simply the most aggressive and the most likely to affect the owners we work with, given how much appreciated property sits in the state. If you are exchanging out of California, or out of any high-tax state, into another jurisdiction, the ongoing state-level reporting belongs in the plan from day one, not discovered years later when a notice arrives. It is one more reason we map the full picture, federal and state, before a relinquished property ever closes, as part of our exchange process.
Frequently asked questions about the California clawback
Do I have to file FTB Form 3840 every year?
Yes. As long as the California-source gain remains deferred in an out-of-state replacement property, Form 3840 is due annually, even in years you have no other California filing requirement.
Does the clawback apply if I've moved out of California?
Yes. It applies to residents and nonresidents alike. Leaving the state does not end the obligation; the deferred California gain and its annual reporting follow you.
When does California actually collect the tax?
When you recognize the deferred gain, typically by selling the out-of-state replacement property in a taxable transaction. At that point California taxes its share of the original California-source gain.
Can the California clawback ever be eliminated?
Potentially, yes. Because the clawback applies when the gain is recognized, continuing to exchange or holding the property until death, where a step-up in basis applies, can eliminate the deferred gain and California's claim along with it. Confirm the specifics with your CPA.
What happens if I don't file Form 3840?
The Franchise Tax Board can estimate your deferred gain and assess tax and penalties on its own terms. Staying current with the annual filing keeps the reported gain accurate and under your control.