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Investor WorkspaceA little clarity for your next decision.
By Jerry Baker
California generally requires annual Form FTB 3840 reporting when a 1031 exchange carries California real estate gain into property outside the state. The gain keeps its California source, and another exchange or a move away does not by itself end the reporting duty. This guide explains how to keep that record accurate from the first exchange through later sales.
The word “clawback” sounds as if California cancels a completed exchange. That is not a useful starting point. A valid exchange can defer qualifying gain while the state keeps track of the portion that came from California property.
The Franchise Tax Board says the source of the gain is determined when it is realized and is preserved even when recognition occurs later. Realized gain is the economic tax gain computed at the exchange. Recognized gain is the portion included in taxable income now. Deferred gain is the amount carried forward under the applicable rules. [1] [2]
The annual form creates a record of that carried amount and the property to which it relates. It is not an annual tax bill for the full deferred gain. It is also not a substitute for the California return required when gain is later recognized.
The authorities here were checked October 7, 2026. The posted 2025 form instructions are used for their reporting framework, not as a source of filing dates for every future year. For broader investment choices, see the separate California DST investor guide.
The FTB’s current reporting page states two conditions: California property is exchanged for property outside California, and some California-source realized gain or loss is not recognized. When both occur, Form FTB 3840 generally begins in the exchange year and continues each year while the amount remains deferred. [1]
California added the specific annual information-return duties in Sections 18032 and 24953 through Assembly Bill 92. The provisions apply to exchanges in taxable years beginning on or after January 1, 2014. The current FTB instructions continue to cite both provisions. [3] [2]
This is not a rule limited to people who move out of California. A lifelong California resident can trigger the form by acquiring out-of-state replacement property. So can a nonresident who sells California investment real estate in a qualifying exchange.
Nor is it triggered by every out-of-state investment. If you buy property with new cash and have no relevant California exchange history, that purchase alone does not satisfy these two conditions. Your other tax and filing duties still need review.
The form instructions cover individuals, estates, trusts, partnerships, corporations, and other listed entities. They make a specific distinction for a disregarded entity: its owner files the form. Confirm the taxpayer that reported the exchange rather than choosing a name from the latest bank statement. [2]
That distinction can matter when property was held in a single-member LLC or a trust. State legal title and federal tax identity do not always look identical. Your CPA should reconcile the return, identification number, title documents, and exchange records before deciding who files.
If the taxpayer otherwise files a California income tax return, the form generally accompanies that return. If no other California return is required, the taxpayer files the information return separately, including the required signature. A lack of current California rental income does not automatically excuse this separate filing.
When a different tax preparer takes over, flag the form by name. A new preparer may see no California property on the current asset list. Without the exchange history, the remaining filing duty can be easy to miss.
The initial form reports the exchange that occurred in the tax year. The instructions direct the filer to complete both sides. Descriptions and dates in Part I come from the federal exchange reporting, while Part II starts with specified federal Form 8824 amounts. [2]
Schedule A then does work that a federal-only record cannot do. It identifies properties given up and received, indicates California locations and ownership percentages, and records California adjusted basis and deferred gain. Where state and federal rules differ, the supporting calculation must show the difference.
Keep the documents that explain those entries: closing statements, the exchange agreement, identification notices, purchase records, basis schedules, and any debt allocations. A form containing a number is stronger when the file shows where that number came from.
Also record who approved the allocation among replacement properties. A later sale may involve only one branch of the exchange. If the first-year file contains just one total gain number, later reporting becomes much harder.
Adjusted basis is the tax amount remaining after the relevant additions and reductions. It is not the mortgage balance, assessed property value, or equity in the building. Depreciation, improvements, credits, and prior exchanges can affect it.
California and federal basis can differ because their tax rules differ. The FTB instructions expressly call for California adjusted basis and an explanation of the California deferred-gain calculation. The current conformity publication lists differences that can require separate records. [2] [4]
Assume a property sells for $1 million with no selling costs in this simplified example. Its federal adjusted basis is $300,000 and its California adjusted basis is $340,000. Before considering exchange treatment or any special gain rules, the gains are $700,000 federally and $660,000 for California.
The $40,000 difference does not disappear because one closing statement serves both returns. If all applicable gain is deferred, the records need to preserve the separate amounts and resulting bases. The example shows arithmetic only; it does not assume why the basis difference arose.
A seller may remember how much money reached the qualified intermediary more readily than the property’s tax basis. Those are different facts. Paying a loan at closing reduces the cash available to reinvest, but the payoff does not by itself reduce realized gain.
For example, investment land worth $1.8 million has a $600,000 California adjusted basis and a $500,000 mortgage. With no selling costs or other adjustments, the realized gain is $1.2 million. Cash after the payoff is $1.3 million. Neither figure should replace the other on the worksheet.
Assume a valid, fully deferred exchange acquires $1.8 million of qualifying replacement real estate using $1.3 million of equity and $500,000 of replacement debt. Under these stated assumptions, the total replacement basis is $600,000. Section 1031 preserves deferred gain through the basis rules. [5]
Real closings need more work. Cash received, debt relief, new debt, nonqualifying property, and expenses can change the result. Do not use this simplified example to decide which closing charges reduce gain or create taxable boot.
The FTB directs taxpayers receiving more than one property to allocate the entire California deferred gain among the properties received, regardless of location, and attach an explanation. The right allocation comes from the applicable tax rules and facts; it is not a free choice of which property should carry the tax history. [2]
Consider a separate, hypothetical land-only exchange. A California property worth $1.8 million has a $600,000 basis. There is no debt, cash received, cost, or special adjustment. A valid exchange receives Property A worth $1.08 million and Property B worth $720,000, both outside California.
Assume the CPA confirms a 60/40 allocation is proper on these simple facts. The $1.2 million deferred gain is divided into $720,000 for A and $480,000 for B. A’s basis is $360,000, and B’s is $240,000. The gain shares total $1.2 million; the bases total $600,000.
| Replacement | Value received | Allocated deferred gain | Basis in this example |
|---|---|---|---|
| Property A | $1,080,000 | $720,000 | $360,000 |
| Property B | $720,000 | $480,000 | $240,000 |
| Total | $1,800,000 | $1,200,000 | $600,000 |
These are tracking figures, not tax bills. They do not mean a 60/40 split is required for every portfolio. Different assets, locations, liabilities, recognized gain, or state adjustments require their own calculation.
If the property remains in place and the gain is still deferred, the annual form keeps the original exchange year visible. The instructions call for both sides to be completed using the initial or most recently amended information. The form is not merely a new statement of current market values. [2]
Do not reduce the deferred-gain entry because a distribution arrived. Rental income, return of capital, basis changes, and recognition of old exchange gain are different tax questions. Your CPA needs the actual investor statement to determine what happened.
Use an annual checklist with four questions: Do we still hold each replacement? Did any property sell or enter another exchange? Were prior figures corrected? Did the taxpayer’s name, address, or filing circumstances change?
Then save the filed form and proof of filing with the prior-year record. The result should be a chain that someone else can follow without guessing. That matters when a hold lasts longer than expected or an investor changes advisers.
Return to the two-property land example. Suppose A later sells in a taxable transaction for $1.2 million. Assume no selling cost, improvement, depreciation, or other basis change. Its gain is $840,000: the $1.2 million price minus the $360,000 basis.
The record also shows $720,000 of original California deferred gain attached to A. The other $120,000 is the increase from A’s original $1.08 million value to its later $1.2 million price. These components help explain the history; they are not a complete state-tax return calculation.
The actual tax result depends on residence, sourcing, current law, and other adjustments. In particular, do not assume the taxpayer’s current state taxes nothing, or that California taxes every dollar in every nonresident case. Have the CPA determine the recognized amounts and where they belong.
The FTB’s published example instructs taxpayers to remove a sold replacement from the tracking form, report the California-source gain, and attach a statement explaining the sale. B’s remaining $480,000 deferred amount does not vanish merely because A sold. [1]
A second exchange extends the chain. It does not cut it. The FTB gives an example in which one of several out-of-state replacements is exchanged again. The taxpayer updates the original form and files a second Form FTB 3840 showing the new exchange and the California gain carried into it. [1]
Use B from the earlier example. Assume its value remains $720,000 and its basis remains $240,000. It still carries $480,000 of deferred gain. A valid full exchange receives new qualifying land worth $900,000, funded with B’s $720,000 value plus $180,000 of outside cash.
With no costs, debt, boot, or other adjustments, the new land’s basis is $420,000: the old $240,000 basis plus $180,000 added cash. Its $900,000 value less that basis still equals $480,000. Adding cash did not erase the old gain.
Keep a reference from B to the new property and from the new property back to the original California exchange. The FTB says the reporting duty continues even if a later replacement returns to California. Do not assume that crossing the state line again closes the record. [1]
The current instructions specifically address Delaware statutory trusts in the property-description fields. They direct the filer to use the DST name and leave the city, state, and ZIP spaces blank in those fields. Use the tax-year instructions rather than forcing a property mailing address into the trust-name entry. [2]
Still retain the underlying property information. A DST name is not evidence that all its real estate is in Delaware, and a blank field does not remove state sourcing. A portfolio trust can require more supporting detail than a single building.
Ask for the exact legal offering name, ownership percentage, acquisition details, state schedules, and any notice of sale or structural change. Match those records with the subscription and closing documents. Similar marketing names can conceal different legal entities.
If a DST’s future plan involves a partnership contribution or another structure, do not treat it as an ordinary property sale or repeat exchange without review. The tax event and the continued state tracking need their own analysis before anyone checks a final-return box.
An amended form corrects an earlier filing. The instructions call for both sides and an attached explanation of the changes. Preserve the old filing as well as the correction so the next preparer can understand why the figures changed. [2]
A final form applies when the relevant California deferred gain or loss has been recognized. The instructions require the original exchange year, the prior information, and a statement explaining how recognition occurred. A sale notice alone is not proof that every branch of a multi-property exchange is finished.
Before closing a file, reconcile all branches to the original amount. Identify what has been recognized, what remains deferred, and where the remaining amount now sits. A zero on one investment’s statement does not necessarily mean zero for the entire exchange history.
Death, gifts, entity changes, and other nonstandard events need advice based on their own rules. This guide does not supply a universal final-filing answer for them. Keep the history available to the people responsible for the next return.
Do not assume a missed form automatically destroys federal exchange treatment. Also do not ignore it. The statute and current FTB instructions describe an assessment power when a taxpayer fails to file the required information return and also fails to file a required tax return. [3] [2]
In that setting, the FTB may estimate net income from available information, including deferred gain, and propose tax, interest, and penalties. That is more precise than saying every missed form creates an automatic tax bill for the whole exchange.
Give your tax professional the years involved, prior returns, exchange records, and any FTB notice. Confirm whether the problem is a missing initial form, missing annual forms, an incorrect allocation, or a sale that was never reported. Each calls for a different repair.
Do not invent numbers to complete an old form quickly. Rebuild the basis and gain from evidence, and respond within any notice deadline. A corrected record is more useful than a neat form that cannot be reconciled to the transaction.
Form FTB 3840 has tax-return filing dates that depend on the taxpayer and year. The posted 2025 instructions, for example, list April 15, 2026 for calendar-year individuals and October 15, 2026 as the extended date. Those dates concern the 2025 reporting year. [2]
Use the proper year’s instructions for a new filing. Partnerships, corporations, trusts, and individuals do not all share one calendar. Confirm extension requirements and whether the form accompanies a return or is filed separately.
The instructions also address weekend and holiday filing dates. Do not transfer that rule to the federal 45-day identification or 180-day exchange period. Those are different deadlines governed by different provisions.
A practical annual reminder should name the form, original exchange year, related investments, preparer, and expected filing date. Add a second reminder to confirm completion. A recurring note that only says “taxes” is too vague when the duty can last through several properties and advisers.
Keep a short cover sheet at the front of the file. List the old property, the exchange year, the gain still tracked, and each current replacement. Name the person who has the full records. That sheet will not replace a tax return, but it gives a new adviser a place to start. Review it when a property sells and when you change firms. A family member who helps with your affairs should know that the file exists, even if the detailed tax work stays with your CPA.
Not merely because Form FTB 3840 is filed. It is an information return that tracks deferred California gain. Current income and later recognized gain are separate matters. Annual reporting preserves the record; it does not turn the whole carried gain into annual taxable income. [1]
A change in residence alone does not end the duty. The instructions apply regardless of residence and provide for filing the form separately when no other California return is required. Keep tracking the relevant deferred gain until the applicable reporting obligation ends. [2]
No. The FTB expressly describes continuing the record into another exchange. Update the original form, report the new exchange as directed, and explain where the carried gain went. The old California source does not disappear with a new property name. [1]
The instructions require a separate form for each qualifying exchange reported for federal purposes that gives up California property for out-of-state property. Multiple properties within an exchange also need proper schedules and allocations. Ask the preparer to distinguish separate exchanges from separate replacement properties. [2]
No. The loan affects cash and the exchange’s debt calculation. Gain depends on amount realized and adjusted basis, with applicable adjustments. Keep equity, debt, gain, and basis as separate figures rather than using the qualified intermediary’s cash balance as a shortcut.
Yes. Differences in basis and other tax rules can change the California calculation. The form instructions require California basis information and supporting adjustments. Keep both sets of schedules, especially after prior exchanges or depreciation differences. [2] [4]
The instructions link final reporting to recognition of the relevant California deferred gain or loss and require an explanation. Review every replacement branch before treating an exchange as finished. One property’s sale does not necessarily end tracking for other properties. [2]
Provide the initial and later forms, federal exchange returns, closing statements, basis and depreciation schedules, allocation explanations, and sale or exchange notices. Include proof of filing where available. The goal is a continuous history from the California property to the assets still carrying its deferred gain.
Educational information, not an offer or a personal tax, legal, or investment recommendation. Examples are hypothetical and omit stated adjustments. Tax treatment depends on your facts and current law. Review your transaction with your CPA, attorney, and qualified intermediary. Real estate investments can lose value and may be illiquid.
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