California follows the federal deferral. It does not forget the gain.
California conforms to Section 1031 for real property, so a properly structured exchange defers state tax alongside federal tax. What California adds is a long memory. Exchange a California property for replacement property in another state and the Franchise Tax Board expects an information return every year until the deferred gain is finally recognised — and when it is recognised, California claims the share of the gain that arose here, wherever you happen to live by then. The expensive mistakes we are called in to fix are rarely federal. They are almost always state.
Three Things California Does Differently
None of these decide whether your exchange qualifies. All of them decide what it costs, what you file, and for how long. And because California taxes capital gain as ordinary income — at a top marginal rate above thirteen percent — the state share of the bill is usually larger than owners expect.
Form 3840, every year
Exchange California property for property outside California and the state requires an annual information return.
- Filed for the year of the exchange, then again every year the gain remains deferred
- Required even in years you owe California nothing and file no other California return
- Skip it and the FTB is entitled to estimate the deferred gain and assess tax on its own figures
This is the most commonly missed filing in a California exchange, and the easiest to keep current once somebody owns it.
The clawback
California tracks the gain that arose inside the state and taxes it when the deferral finally ends.
- Applies where California property is exchanged into out-of-state replacement property
- Moving to Nevada, Texas or Florida does not extinguish California-source gain
- Triggered when the replacement property is eventually sold in a taxable transaction, however many exchanges later
Withholding at closing
California withholding is settled in escrow, long before a return is filed.
- Real estate withholding generally runs 3 1/3 percent of the gross sale price unless an exemption or the alternative gain-based calculation applies
- A properly documented exchange can support an exemption — the paperwork has to be correct at closing, not reconstructed later
- Take cash out of the transaction and withholding follows the boot
Withholding is not the tax. It is a deposit against the tax. Getting it wrong can still tie up a six-figure sum until a return is filed and processed.
Where California exchanges come apart.
Three patterns account for most of it. An owner exchanges into an out-of-state property, files Form 3840 once, and stops. An owner takes a modest amount of cash at closing without realising that the mortgage payoff on the property being sold has already created boot — and that California withholding follows it. Or an owner exchanged years ago, changed preparers twice, and no longer holds the carryover basis that both the federal and the California calculation depend on.
Reconstructing basis after the fact is possible. It is slower and more expensive than establishing the number before you list.
What we need to run the California number.
A California exchange takes the same six federal inputs plus three state-specific ones. Most owners already hold all nine between their closing file, their lender and their last return.
- Expected sale price — the contract price, or your broker’s current opinion of value
- Debt on the property being sold — the mortgage payoff balance, plus any second lien, line of credit or seller financing retired at closing. This sets the debt you have to replace to avoid mortgage boot, and it drives the withholding question
- Original purchase price — and the date you acquired it
- Capital improvements — what you have put into the property since purchase
- Depreciation claimed to date — from your depreciation schedule, not an estimate
- How title is held — individual, joint, LLC, partnership or trust, and who the other owners are
- Where the replacement property will sit — inside California, or out of state. This is what determines whether Form 3840 and the clawback come into play
- Any prior Form 3840 filings — if this property came out of an earlier exchange
- Your residency — California resident, part-year, or non-resident owning California property
If you have already exchanged into this property, the carryover basis from the prior exchange is the ninth input — and the one most often lost between preparers. Reconstructing it is part of the work.
California, specifically
I am moving to Nevada. Does that end my California exposure?
Not for gain that arose in California. The state sources the deferred gain to the property that produced it, not to where you live when the deferral ends. Changing residence changes how future income is taxed; it does not erase the California-source gain sitting inside a replacement property you acquired in an exchange out of California.
What is Form 3840 and how long do I have to file it?
It is California’s like-kind exchange information return. It is filed for the year you exchange California property for property outside California, and then annually for as long as the gain remains deferred — potentially for decades, and in years when you have no other California filing obligation. It is an information return, not a tax return, but failing to file it gives the FTB grounds to estimate the deferred gain and assess accordingly.
How much debt do I have to replace on a California sale?
The same rule applies as federally: the mortgage paid off on the property you sell is treated as value you received, so you generally need to replace it with new debt, with cash of your own, or with a combination. California adds a second consequence. Boot created by debt relief is taxable in California too, and it interacts with the withholding calculated at closing. This is why the payoff balance is one of the first figures we ask for.
Will escrow withhold 3 1/3 percent even though I am exchanging?
Not if the exchange is properly documented before closing. Withholding is administered by the escrow or title company on the basis of the certification you provide, so the exemption has to be established at the closing table rather than argued afterwards. If you take boot, expect withholding on the boot.
Do I need a California preparer?
You need someone who files California returns routinely. Enrolled Agent status is a federal credential valid in all fifty states, and the California filings are handled here as a matter of course. Most of our exchange work touches California on one side of the transaction or the other.
I already exchanged out of California and never filed 3840. Now what?
Call. The answer depends on how many years are open, whether the replacement property has since been sold, and what was reported federally. Bringing the filings current voluntarily is a materially better position than waiting for a notice.
Start With the Number
Before you list, before you sign, before the clock starts — find out what is actually at stake.
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This is general information only, not tax advice. Consult a qualified tax professional — including an Enrolled Agent — for guidance specific to your situation. Read the full disclaimer.