California Form 3840 and the 1031 Clawback Rule: 2026 Reference for California Residents

Why California Created Form 3840

Until 2014, California-resident investors who 1031 exchanged out of California real estate into out-of-state replacement property simply lost the California tax forever. The federal 1031 deferral preserved the gain for federal purposes; the eventual sale of the out-of-state replacement was outside California’s jurisdiction; California recovered nothing.

California Assembly Bill 92 (2013), effective for tax years beginning January 1, 2014, changed that. AB 92 added Section 18032 to the California Revenue and Taxation Code, requiring annual reporting of out-of-state replacement property acquired in a 1031 exchange and recapturing the deferred California gain when the replacement property is eventually sold or otherwise disposed of in a recognition event.

Form 3840 (“California Like-Kind Exchanges”) is the annual reporting vehicle. The form is filed with the California Franchise Tax Board (FTB) every year the deferred California gain remains outstanding. The reporting obligation continues indefinitely, even after the investor moves out of California, until the recognition event.

This page is a state-specific deep dive. For the federal 1031 framework, see the investment grade 1031 exchange pillar guide. For state tax considerations more broadly, see the CPA’s Guide to Investment Grade 1031 Exchanges.

When Form 3840 Filing Is Required

Form 3840 is required when ALL of the following are true:

• The investor is a California resident or a non-resident with California-source income
• The investor disposed of California real property in a Section 1031 exchange
• The replacement property is located outside California (or is non-real-property in some narrow circumstances)
• The deferred California gain has not yet been recognized

If all four conditions apply, Form 3840 must be filed every year the deferral continues. The first filing is for the tax year of the exchange. Subsequent filings continue annually until the recognition event. The form does not generate any tax liability in the years of filing; it merely reports the deferred amount and confirms the property is still held.

If the investor 1031 exchanges into California replacement property (rather than out of state), Form 3840 is not required because California retains direct jurisdiction over the replacement property. The clawback rule applies only to out-of-state replacements.

The Deferred California Gain Calculation

The deferred California gain is calculated as the realized gain on the relinquished California property, less any portion of the gain recognized as boot at the federal level. The calculation is done on Form 3840 in the year of the exchange and reported on subsequent annual filings.

Example. California-resident investor sells a $4M California property with a $1.5M basis. Realized gain: $2.5M. Investor 1031 exchanges into a $4M Texas NNN property with no boot. Deferred California gain: $2.5M. Form 3840 filed annually starting with the year of the exchange, reporting the $2.5M deferred gain.

If the exchange involves boot (cash boot, mortgage boot, or personal property boot recognized federally), the boot portion is recognized as gain in the year of the exchange and is taxable to California in that year. Only the non-boot portion of the gain becomes deferred California gain subject to Form 3840 reporting.

The Recognition Event

The deferred California gain becomes taxable to California when the replacement property is eventually sold or otherwise disposed of in a recognition event. The recognition event is typically:

• The sale of the replacement property outside a 1031 exchange
• A taxable disposition (foreclosure, deed in lieu, condemnation with cash proceeds)
• Conversion of the property to non-investment use (rare)

If the replacement property is sold in another 1031 exchange (a second-leg deferral), the deferred California gain rolls forward to the next replacement property and Form 3840 reporting continues. The deferral can theoretically continue indefinitely through chained 1031 exchanges, just like the federal deferral.

If the investor dies holding the replacement property, the federal §1014 step-up eliminates the deferred federal gain. California, however, does not necessarily eliminate the deferred California gain. The treatment of deferred California gain at death is a complex area; some practitioners argue California’s clawback effectively dies with the taxpayer, while others note that the heirs may inherit the Form 3840 reporting obligation. Consult California state tax counsel on this specific question.

The Residency-Change Strategy

The most common California strategy is to plan a bona fide residency change to a no-tax state (Texas, Florida, Tennessee, Nevada, Wyoming) before the eventual sale of the replacement property. Because California’s clawback applies based on the source of the original gain (California real property) rather than the residency of the taxpayer at the eventual sale, the residency change does not directly eliminate the clawback. However, several mechanics can reduce or eliminate California’s recovery:

1. Bona fide residency change. The investor must establish bona fide residency in the new state, which California scrutinizes carefully. Indicators include changing voter registration, driver’s license, vehicle registration, primary residence, business operations, and physical presence (more than 183 days per year in the new state). Maintaining significant California ties (a vacation home, business operations, family residence) can defeat the residency change.

2. Continued 1031 deferrals after the move. Once a non-California resident, the investor can continue to 1031 the replacement property without further Form 3840 obligations on subsequent California-source gain (because there is no further California-source gain). The original deferred California gain remains under Form 3840 reporting until ultimate recognition.

3. Buy-exchange-die at non-California domicile. If the investor dies as a non-California resident holding the replacement property, the federal step-up applies and the California treatment depends on detailed estate planning. California has aggressive rules on out-of-state heirs of California-source gain, so estate planning counsel is essential.

The strategy is not foolproof. California has audited and challenged residency changes that lack substance, and the FTB has won most of these cases. The residency change must be real and well-documented.

Other Clawback States

California is the most aggressive, but not the only state with 1031 clawback or non-conformity rules.

Oregon. Oregon adopted similar clawback rules in 2018, requiring annual reporting on Schedule 1031 OR for out-of-state replacement property. The mechanics mirror California’s: the deferred Oregon gain follows the investor until the eventual taxable sale.

Massachusetts. Massachusetts has clawback-style rules for non-conforming 1031 exchanges, with annual reporting requirements similar to California’s. Massachusetts residency rules are also aggressive on the residency-change strategy.

Pennsylvania. Pennsylvania does not recognize 1031 deferral for individual income tax purposes (it does for corporate). Individual Pennsylvania residents owe state tax on the gain in the year of the relinquished sale even if a federal 1031 is completed. There is no clawback to track because the tax is paid up front.

Other states. Most states defer state capital gains tax in parallel with federal deferral. Florida, Texas, Tennessee, Nevada, Washington, Wyoming, and Alaska have no state income tax, so the question does not arise. New York, New Jersey, Illinois, and most other high-tax states conform to federal 1031 deferral without clawback.

Form 3840 Filing Mechanics

Form 3840 is filed with the California Franchise Tax Board annually. Specific mechanics:

• First filing. The year of the exchange. Includes details of the relinquished California property, the out-of-state replacement, the realized gain, the deferred California gain.
• Subsequent filings. Every year the deferred gain remains outstanding. Each filing confirms the property is still held and re-states the deferred amount.
• Penalty for non-filing. $50 per month per missed filing, up to $250 per year. The penalty is small but compounds over years; multi-year non-filing can produce material liabilities.
• Filing deadline. The same as the California state income tax return (April 15 of the following year, or with extensions).
• E-filing. Form 3840 is e-fileable through the California FTB e-file system or through tax preparation software that supports California state filings.

The CPA who handles the federal 1031 documentation typically also handles the California Form 3840. CPAs unfamiliar with the California clawback often miss the annual filing requirement, which creates accumulating penalty exposure.

Common California 1031 Mistakes

1. Failing to file Form 3840 annually. The annual filing is mandatory. Penalty exposure compounds.
2. Assuming residency change eliminates the clawback. The clawback follows the original California-source gain, not the taxpayer’s residency at the eventual sale. Residency change reduces but does not always eliminate the obligation.
3. Treating the deferred California gain as eliminated at death without estate counsel. California’s treatment of deferred gain at death is complex. Estate planning must specifically address this.
4. Forgetting Form 3840 when chaining 1031 exchanges. Each subsequent 1031 must update the Form 3840 to reflect the new replacement property.
5. Underestimating CPA cost over time. Annual Form 3840 filings add CPA cost for the indefinite life of the deferral. Factor this into the long-term economics of an out-of-state 1031.

For California Owners Considering a Sale: Pre-Listing Strategy

Investment Grade Income Property, LP represents investors on both acquisitions and dispositions of investment grade NNN nationally. Through Broker of Record co-listing partnerships in all 50 states, we list properties on behalf of sellers, source qualified 1031 capital, and represent owners across the full lifecycle of a transaction.

For California owners contemplating a sale, the most valuable conversation happens before the listing agreement is signed. We model the disposition scenarios on your specific property (sell outright, 1031 into California, 1031 out of state with Form 3840 implications, refinance, contribute to UPREIT) and project the after-tax proceeds under each path including California state tax. Where the analysis points to an out-of-state 1031, we coordinate with the client’s CPA on Form 3840 setup and represent on both legs of the exchange under one engagement: listing the relinquished California property and sourcing the out-of-state replacement.

For California sellers planning a residency change, we coordinate the timing of the move, the relinquished sale, and the replacement acquisition to maximize the after-tax outcome. There is no fee for the initial scenario analysis. See contact Investment Grade.

Frequently Asked Questions: California Form 3840

Related Resources

• Investment Grade 1031 Exchange: The Complete 2026 Guide
• The 1031 Exchange 45-Day Rule
• The 1031 Exchange 180-Day Rule
• 1031 Exchange vs Qualified Opportunity Zone 2.0
• Boot in a 1031 Exchange Explained
• How to Choose a Qualified Intermediary
• The CPA’s Guide to Investment Grade 1031 Exchanges
• Contact Investment Grade: Acquisitions and Dispositions

This page is a comprehensive educational reference on California Form 3840 and the California 1031 clawback rule, current as of 2026. It is not legal, tax, or investment advice. California state tax counsel is essential for any 1031 exchange involving California real estate, residency changes, or estate planning. Investment Grade Income Property, LP represents real estate investors on both acquisitions and dispositions and is not a tax advisor, qualified intermediary, or law firm.