California 1031 Exchange: Form 3840 & the Clawback Rule

If you own rental property in California, a 1031 exchange is one of the most powerful tax tools available to you — arguably more powerful than it is for landlords anywhere else in the country, because California's tax rates are the highest in the country. But California attaches a string to that deferral that surprises a lot of sellers: the state never forgets the gain you deferred.

Exchange a Sacramento duplex for a Texas apartment building and you owe no tax today. But the California-source gain you deferred doesn't disappear — it follows you. When you eventually sell the Texas property in a taxable sale, California expects its cut of the gain that accrued while the money was in California, even if you moved to Texas years ago. Practitioners call this the "clawback" rule, and the Franchise Tax Board enforces it with an annual filing requirement: Form 3840.

This article walks through how the clawback works, who has to file Form 3840 and what happens if you don't, the withholding rules at closing, the stacked tax math that makes deferral so valuable for Californians, and what it all means if you're exchanging into a Delaware Statutory Trust with properties spread across several states.

California Recognizes 1031 Deferral — But Never Forgets

First, the good news: California fully conforms to Section 1031 for real estate. If your exchange qualifies for federal deferral, it qualifies for California deferral too. You don't owe the FTB anything at the time of a properly executed exchange, whether your replacement property is in Fresno or Florida.

The catch is sourcing. Gain that accrued on California real estate is California-source income, and California taxes California-source income regardless of where you live when you recognize it. A 1031 exchange defers gain — it doesn't re-source it. So when you exchange California property for out-of-state property, your deferred California gain rides along inside the new property's basis, waiting.

When the deferral finally ends — you sell the out-of-state replacement property without doing another exchange, or you take boot in a partial exchange — California claws back tax on the deferred California-source portion of the gain. You'd typically report it on a California nonresident return (if you've left the state) or your regular resident return (if you haven't). Your new home state may tax the same sale too; whether you get an offsetting credit depends on the states involved, which is one of several reasons to consult your CPA before the exchange, not after.

One important flip side: this only applies to gain that accrued in California. Exchanges that stay inside California, and exchanges of out-of-state property into California property, don't trigger the clawback regime — there's no deferred California-source gain leaving the state to track.

Form 3840: The FTB's Tracking Mechanism

How does California keep tabs on gain that's now embedded in a building two thousand miles away? With FTB Form 3840, the California Like-Kind Exchanges information return. It's been required for exchanges completed in 2014 and later.

Who has to file

Anyone who exchanges California real property for out-of-state real property and defers gain under Section 1031 must file Form 3840 — and residency is irrelevant. A Nevada resident who sells a California rental in an exchange has the same filing obligation as a lifelong Californian. Individuals, trusts, partnerships, LLCs, and corporations are all covered.

How often, and for how long

This is not a one-time form. You file Form 3840 for the year of the exchange and then every year afterward until the deferred California gain is finally recognized. If you file a California return anyway, it attaches to that return; if you have no other California filing obligation, you file Form 3840 on its own by the return due date. Do another exchange down the road and the obligation continues — the deferred California gain just keeps carrying forward into each new Form 3840.

What happens if you don't file

Skipping Form 3840 is a genuinely bad idea. If you fail to file, the FTB can issue a Notice of Proposed Assessment and assess tax on the deferred gain as if the deferral never happened — potentially years before you'd otherwise owe anything, plus interest and penalties. The FTB knows about your exchange (withholding paperwork and closing records see to that), so silence doesn't make the obligation go away; it just converts a routine information return into an audit problem. Your CPA can typically prepare the annual filing in minutes once the initial exchange-year form is done — there's no good reason to skip it.

Withholding at Closing: Form 593 and the 1031 Exemption

Separate from the clawback, California requires real estate withholding when you sell property in the state — generally 3 1/3% of the gross sales price (or an elected alternative based on the estimated gain), remitted through FTB Form 593, the Real Estate Withholding Statement.

Here's the part that matters for exchangers: a qualifying 1031 exchange is exempt from withholding. You certify the exchange on Form 593 at closing, and no California tax is withheld from your proceeds — which is essential, because in an exchange your full proceeds need to go to the qualified intermediary, not to the FTB. Two caveats:

• Boot is still subject to withholding: If you receive cash or other non-like-kind property at closing, withholding generally applies to that portion.
• A failed exchange unwinds the exemption: If your exchange doesn't complete — you miss the 45-day or 180-day deadline — withholding obligations kick back in on the proceeds you receive. (A failed 1031 exchange has federal consequences too, so the withholding is the least of it.)

Escrow companies handle Form 593 routinely, but make sure your escrow officer and qualified intermediary both know a 1031 exchange is in play before closing day — fixing withholding after the fact means waiting for a refund.

The Stacked Tax Math: Why Deferral Is Worth More in California

California taxes capital gains as ordinary income — there is no preferential state rate — and the top marginal rate is 13.3%. Stack that on top of the federal layers and a California landlord selling outright can face:

Consider a worked example. Say you bought a rental for $500,000, claimed $200,000 of depreciation over the years, and sell for $1,200,000. Your adjusted basis is $300,000, so your total gain is $900,000 — $200,000 of depreciation recapture and $700,000 of appreciation. At top rates, the damage on an outright sale looks roughly like this:

• Federal LTCG: up to 20% of $700,000 = $140,000
• Recapture: up to 25% of $200,000 = $50,000
• NIIT: 3.8% of $900,000 = $34,200
• California: up to 13.3% of $900,000 = $119,700

That's roughly $344,000 — well over a third of the gain — with more than a third of that bill coming from Sacramento alone. Your actual rates depend on your income and filing status (that's your CPA's department), but the shape of the math holds: for high-bracket Californians, the state layer alone can rival what most other states' residents pay in total. Run your own numbers with our capital gains tax calculator for selling rental property to see what a 1031 exchange would defer in your situation.

This is why the clawback, annoying as the paperwork is, shouldn't scare you off an exchange. Deferring a $344,000 tax bill — keeping that capital invested and compounding for years or decades — is worth an annual information return many times over. The clawback doesn't add tax; it just preserves a liability you were always going to owe if you sold without exchanging.

The DST Wrinkle: One Exchange, Several States

Many California landlords doing a 1031 exchange into a DST end up in a diversified portfolio — a single DST (or several) holding properties in, say, Texas, Arizona, Georgia, and Tennessee. Because DST investors own fractional interests in the underlying real estate, slices of your exchange effectively land in each of those states.

For Form 3840 purposes, nothing fundamental changes: you exchanged California property for out-of-state property, so you file, and you keep filing annually until the deferred gain is recognized. The form asks you to identify the replacement properties and allocate the deferred gain among them, so a multi-property DST means a longer schedule — tedious, but your DST sponsor provides the property-level detail and any competent CPA can handle it.

The multi-state footprint also matters beyond California. States where the DST properties sit may tax your share of rental income and eventual sale gain, which can mean nonresident return obligations in several states (some sponsors' structures and some states' filing thresholds soften this in practice — ask before you invest). And when a DST sells its property, you face the same fork in the road as any seller: exchange again and keep deferring (Form 3840 continues), or cash out and recognize everything — including California's deferred slice. Our guide to how DST distributions are taxed covers the year-to-year reporting side.

Swap Till You Drop: The Exit That Beats the Clawback

There is one clean way out of the clawback, and it's the same one that eliminates the federal deferred tax: don't sell. Under the "swap till you drop" strategy, you keep exchanging — property to property, or property to DST to DST — until death. At that point, your heirs receive a stepped-up basis equal to fair market value, and the deferred gain is wiped out for federal purposes.

Critically, the step-up eliminates the deferred California gain too. California's clawback reaches deferred gain that is eventually recognized — and with a basis step-up at death, it never is. No recognition, no clawback, and the Form 3840 filing obligation ends with it. For a Californian carrying decades of appreciation and depreciation, that's the difference between heirs inheriting the full value of the portfolio and heirs inheriting it minus a six-figure tax bill. The mechanics of running this play with DSTs — including the eventual option of a 721 exchange into a REIT's operating partnership — are laid out in our DST 1031 strategy guide.

Should You Just Buy a California DST Instead?

Some DSTs hold California properties, and exchanging into one sidesteps the clawback machinery entirely: California property for California property means no Form 3840, no annual tracking, and no multi-state sourcing puzzle for that gain. But avoiding paperwork is a weak reason to pick an investment. The real trade-offs:

• Simplicity favors California DSTs: No 3840, and your income and eventual gain stay in the state where you likely already file.
• Economics often favor other states: Sponsors gravitate toward Sunbelt markets for their growth, landlord-friendly law, and cap rates. Limiting yourself to California inventory shrinks your menu considerably.
• Ongoing state tax favors leaving: Income from California DST property is California-source income taxed at up to 13.3% every year. Income from property in a no-income-tax state isn't taxed by that state — and if you later move out of California, it may escape state tax entirely. The clawback only preserves tax on the pre-exchange gain; everything the replacement property earns and appreciates afterward is sourced to its own state.
• Diversification argues against concentration: If your entire net worth already rode on one California property, one goal of a DST exchange is usually to spread it out — by geography as well as by property type.

For most investors, an annual information return is a small price for a better and more diversified portfolio. Weigh it the way you'd weigh any of the pros and cons of DSTs — as one factor, not the deciding one.

A note on other states

California's regime is the most formalized, but it isn't unique in spirit. Several states assert the right to tax gain sourced to property within their borders when it's eventually recognized, and most states with an income tax expect nonresident returns from out-of-state owners of in-state rental property. Pennsylvania, notably, only began recognizing 1031 deferral for personal income tax in 2023. Wherever your replacement properties land, have your CPA map the state filing picture before you close — not at tax time.

Conclusion

The California clawback rule sounds ominous, but understood properly it's just bookkeeping: California honors your 1031 deferral in full, tracks the deferred gain with an annual Form 3840, and collects only if and when you recognize that gain — which, with continued exchanging and a basis step-up at death, may be never. File the form every year, certify your exchange on Form 593 at closing, and the FTB has no reason to bother you.

Meanwhile, the same brutal tax stack that makes the clawback feel threatening — up to 13.3% state, up to 20% federal, 3.8% NIIT, up to 25% recapture — is exactly what makes exchanging instead of selling so valuable for Californians. If you're worn out on midnight maintenance calls and Sacramento's landlord regulations but can't stomach handing a third of your equity to tax authorities, a 1031 exchange into passive DST ownership solves both problems at once. Start with our guide for the tired landlord ready to exit the rental business.