Crossing State Lines with a 1031 Exchange: Multistate Sourcing, the California and Oregon Clawback, and What Happens When You Sell the Replacement Property
A 1031 exchange is a creature of federal law. Internal Revenue Code § 1031 defers federal capital gains tax when you roll the equity from one investment property into another of like kind. But you do not pay tax to the federal government alone. Forty-one states and the District of Columbia impose a broad-based income tax, and each of them has its own view of what happens when a property crosses a state line inside an exchange.
Most investors understand the federal timeline — 45 days to identify, 180 days to close. Far fewer understand that the moment a relinquished property in one state is exchanged for a replacement property in another, a second set of questions opens up: Which state gets to tax the gain? When? And does the deferral you earned federally survive at the state level at all?
This article is about the state side of the interstate exchange. It covers how gain is sourced among states, which states conform to § 1031 and which reach back to collect later, how the California and Oregon clawback regimes actually operate over the life of the replacement property, and — through a detailed case study — what happens to a California exchanger who moves equity into Washington and sells that Washington property years down the road.
A companion article on this site, Exchanging Out of California (or Oregon): The Holdback, the Clawback, and the Filing That Never Ends, walks through the withholding forms and the annual filing mechanics in detail. This article takes a wider lens: the sourcing principles that sit underneath all of it, and the long arc of a single exchange from California into Washington.
First Principles: How States Source a Real Property Gain
Before you can understand the clawback, you have to understand sourcing. "Sourcing" is the tax term for deciding which state a particular item of income belongs to. It is the foundation of every multistate tax question, and for real estate it is remarkably consistent.
Gain from the sale of real property is sourced to the state where the property is located. This is the near-universal rule. It does not matter where you live, where you signed the papers, or where the money lands. If you sell an apartment building in Sacramento, the gain is California-source income — even if you are a lifelong resident of Texas who has never set foot in the building.
This single rule drives two separate taxing claims that every interstate exchanger needs to keep straight:
- The residency claim. The state where you live taxes your entire income, wherever it is earned — your "worldwide" income, in tax parlance. A California resident pays California tax on a gain from selling property in Florida, because California taxes residents on everything.
- The source claim. The state where the property sits taxes the gain regardless of where you live, because the income is sourced there.
When you live in the same state where the property sits, the two claims collapse into one and there is nothing interesting to discuss. The interstate exchange is interesting precisely because it pulls these two claims apart — and, as we will see, because one state has decided that its source claim does not expire just because you deferred the gain and moved the equity somewhere else.
The Credit for Taxes Paid to Other States
When two states both have a legitimate claim on the same dollar of gain — your resident state on worldwide income, and the property's state on source income — the Constitution does not let both of them collect in full. The mechanism that prevents genuine double taxation is the resident credit: your home state gives you a credit for income taxes you actually paid to the other state on the same income.
This matters enormously in the exchange context, and it produces a counterintuitive result later in this article. When a taxpayer eventually owes tax to California on a deferred, California-source gain but lives in a state with no income tax, there is no home-state tax to credit it against — and no home-state tax to shelter the gain either. The taxpayer simply pays California. The credit mechanism only helps when the resident state actually imposes a tax that the source-state payment can offset.
State Conformity to § 1031: Who Honors the Deferral
The next question is whether a state honors the federal deferral at all. If a state does not conform to § 1031, then the exchange that is tax-free federally could be a fully taxable sale for state purposes — a nasty surprise.
The good news for real estate investors is that, as of 2026, every state with a broad-based income tax conforms to § 1031 for real property exchanges. When you defer federally, you defer at the state level too. The federal mechanics — the 45-day identification window, the 180-day exchange period, the qualified intermediary requirement — apply uniformly across the country.
That uniformity is relatively recent. Pennsylvania was the last holdout: for decades it treated a like-kind exchange as a taxable event for personal income tax purposes. That changed with Act 53 of 2022, which brought Pennsylvania into conformity with § 1031 for tax years beginning in 2023. Today the map is clean.
But two important caveats survive that clean map.
First, the Tax Cuts and Jobs Act narrowed § 1031 itself. Since January 1, 2018, § 1031 applies only to real property. Exchanges of personal property — equipment, vehicles, artwork, franchise rights — no longer qualify federally, and therefore do not qualify at the state level either. A state conforming to § 1031 is conforming to the post-2018 version. (For how this reshapes a working farm or ranch sale, see our article Farms, Ranches, and Timberland in a 1031 Exchange.)
Second, conformity to the deferral is not the same as surrendering the source claim. A state can honor your deferral today and still reserve the right to tax the deferred gain when you finally recognize it — even if the replacement property, and you, are long gone from the state. That reservation is the clawback, and only a handful of states enforce it.
The Clawback States
Four states are commonly identified as actively tracking and reclaiming deferred, in-state-source gain: California, Oregon, Massachusetts, and Montana. California and Oregon operate the most developed regimes, with dedicated annual reporting forms and, in California's case, an automated enforcement system. Massachusetts and Montana assert the same underlying authority — the right to tax gain that accrued while the property sat within their borders — but with less formalized tracking machinery.
The balance of this article focuses on California and Oregon, because they are the states a Puget Sound qualified intermediary sees most often on the relinquished side of a westbound exchange.
The California Clawback in Depth
California's regime rests on two statutes enacted by Assembly Bill 92 in 2014: Revenue and Taxation Code § 18032, which applies to individuals and pass-through entities, and § 24953, which applies to corporations. Before AB 92, California-source gain deferred into out-of-state replacement property frequently slipped out of the state's reach entirely. The 2014 legislation closed that gap by imposing a permanent tracking obligation.
The operative idea is simple to state and long-lived in practice: when you exchange California real property for replacement property located outside California, the gain that accrued while the property was in California remains California-source income — indefinitely — until it is recognized in a taxable transaction. The exchange defers the tax. It never erases the source.
To keep track, California requires FTB Form 3840, "California Like-Kind Exchanges," filed in the year of the exchange and in every subsequent year until the deferred gain is recognized. The obligation does not depend on your residency. A taxpayer who exchanges out of California, moves to another state, and has no other California income must still file Form 3840 every year as a standalone information return. Miss it, and the FTB's EDR2 data-matching system — which cross-references your federal Form 8824 against state records — can issue a Notice of Proposed Assessment that assumes the property was sold and demands the full deferred tax, plus interest and penalties. The statutory non-filing penalty runs $50 per month up to $250 per year, but the far larger exposure is the estimated assessment itself.
What Actually Gets Taxed, and to Whom
The most important and most misunderstood question is how much California taxes when the replacement property is finally sold. The answer turns on residency at the moment of that final sale.
If you are a nonresident of California when you sell the replacement property, California taxes only the original deferred gain — the California-source gain that accrued while the property was on California soil. The appreciation that occurred after the exchange, on property located in another state, is not California-source income and is not swept in.
If you are a California resident when you sell, California taxes your entire worldwide gain — the original deferred amount plus every dollar of post-exchange appreciation — because residents are taxed on everything. Moving back to California before the final sale can therefore transform the tax picture dramatically.
California does not offer a preferential rate for long-term capital gains; all capital gains are taxed as ordinary income, with a top marginal rate reaching 13.3 percent on very high incomes. Whatever the rate, it is applied to the deferred gain figure that Form 3840 has been carrying all along.
How the Obligation Finally Ends
The Form 3840 filing — and the deferred California tax — terminates only when one of the following occurs:
- The replacement property is sold in a fully taxable transaction and the California tax is paid.
- The owner dies, and the federal step-up in basis eliminates the deferred gain. (The treatment of the deferred California gain at death is nuanced; heirs should get specific estate-planning advice rather than assume the obligation simply vanishes.)
- The property is contributed to a qualified charity.
- The replacement property is exchanged back into California property, at which point a final Form 3840 with an explanatory statement closes the out-of-state tracking.
And critically: if you keep exchanging — California to Nevada, Nevada to Idaho, Idaho to Washington — the California-source deferred gain rides along the entire chain. Every link requires its own annual Form 3840. The clawback does not care how many exchanges separate you from the original California property.
The Oregon Clawback in Brief
Oregon's regime, codified at ORS 316.738, parallels California's. A taxpayer who exchanges Oregon property for out-of-state replacement property must file Form OR-24 annually until the replacement property is disposed of, and Oregon reclaims its deferred, Oregon-source gain when the replacement property is sold in a taxable transaction. Oregon's top personal income tax rate is 9.9 percent — meaningful, though below California's ceiling. The companion article on this site details Oregon's withholding certificate (Form OR-18-WC) and the seven-business-day pre-closing deadline that governs it.
The conceptual point is identical to California's: conformity to the deferral today, plus a reserved source claim tomorrow, enforced through a filing that follows the property for as long as you own it.
Case Study: California to Washington, and a Sale Years Later
The cleanest way to see how sourcing, conformity, and the clawback interact is to follow a single exchange from start to finish. The figures below are round numbers chosen for illustration; they are not a real transaction, and every actual exchange turns on its own facts.
The Setup
Suppose an investor — call her the taxpayer — owns a small apartment building in Long Beach, California. She bought it years ago for an adjusted basis of $1,000,000, and it is now worth $2,500,000. If she simply sold it, she would face federal capital gains tax and depreciation recapture, plus California tax on the entire $1,500,000 gain at rates up to 13.3 percent.
Instead, she does a properly structured 1031 exchange. She engages a qualified intermediary, sells the Long Beach building, and within her 45-day and 180-day windows acquires a replacement property: a $2,500,000 commercial building in Tacoma, Washington. Because Form 593 was completed with the like-kind exchange box checked before escrow closed, California withholding at closing was avoided. Federally and for California purposes, the entire $1,500,000 gain is deferred. She owes no tax today.
What she now carries with her: a California-source deferred gain of $1,500,000, and an annual FTB Form 3840 filing obligation that will continue every year for as long as she owns the Tacoma building — even though she has now moved to Washington and become a Washington resident.
The Washington Side: A State With No Income Tax on This Gain
Washington is unusual, and it is exactly why this case study is instructive. For its entire history Washington had no broad-based personal income tax. In 2021 it enacted a 7 percent excise tax on certain long-term capital gains (with a 9.9 percent tier on gains above $1 million, and an annual standard deduction indexed for inflation — $278,000 for 2025), and that excise tax contains a categorical, dollar-unlimited exemption: the direct sale of real estate is not subject to the Washington capital gains tax. Not primary residences, not rentals, not commercial buildings, not raw land.
There is one recent development worth stating precisely, because it is no longer accurate to say Washington has no income tax. In 2026 the Legislature enacted the state's first true personal income tax (ESSB 6346) — a 9.9 percent tax on Washington taxable income above $1 million per household, effective January 1, 2028, with the first returns due in 2029 and constitutional litigation already underway. Two features keep it out of this case study. First, it does not take effect until 2028. Second, and more fundamentally, its Section 302 uses a subtract-and-add-back mechanism: all long-term capital gains are first stripped from federal adjusted gross income, and then only those gains that are subject to Washington's capital gains excise tax are added back. Because RCW 82.87.050 exempts the direct sale of real property from that excise tax, a real-property gain is subtracted and never added back — it never reaches Washington taxable income. Between the real-estate exemption from the excise tax and Section 302's mechanism in the income tax, a direct sale of real property in Washington escapes both. (For a dedicated treatment of the new income tax, see our article Washington's Tax Exodus.)
So when our taxpayer eventually sells the Tacoma building directly, Washington imposes:
- No personal income tax on this gain (even after ESSB 6346 takes effect, Section 302 excludes real-property gains from the tax base), and
- No capital gains excise tax (real estate is categorically exempt under RCW 82.87.050).
From Washington's perspective, the sale of the Tacoma building is a non-event for state tax purposes. That is the good news — and it is why so much investment equity flows into Washington real estate. But it is only half of the picture.
The Sale, Years Later
Fast-forward, say, ten years. The Tacoma building has appreciated to $3,300,000. Our taxpayer — still a Washington resident — decides to cash out. She sells the building in a fully taxable transaction. She does not roll the proceeds into another exchange.
This is the recognition event. The California-source gain she deferred a decade earlier is no longer deferred. Here is how each layer of tax falls:
Federal tax. She now recognizes the full gain for federal purposes: her total gain measured from her original $1,000,000 basis (carried over and adjusted through the exchange) up to the $3,300,000 sale price, subject to federal capital gains rates and depreciation recapture. Federal tax was always going to come due on a final, non-exchanged sale; the exchange deferred it, it did not erase it.
Washington tax. None. The sale of the Tacoma building is exempt from Washington's capital gains excise tax (RCW 82.87.050), and even after Washington's new personal income tax takes effect in 2028, that tax's Section 302 subtract-and-add-back mechanism keeps a real-property gain out of Washington taxable income. Her state of residence collects nothing on this sale.
California tax — the clawback fires. This is the crux. California reaches back to the $1,500,000 of gain that accrued while the Long Beach property sat on California soil — the exact figure Form 3840 has been tracking for ten years. Because she is a nonresident of California at the time of this sale, California taxes only that original $1,500,000 of deferred, California-source gain. It does not tax the roughly $800,000 of additional appreciation the Tacoma building earned after the exchange, because that appreciation is Washington-source income earned by a non-Californian. At California's ordinary-income rates for capital gains, the $1,500,000 is taxed up to 13.3 percent.
The Part That Surprises People
Notice what just happened. Our taxpayer moved to a state that imposes no tax on a direct sale of real property. She sold a building in that same state, whose capital gains excise tax exempts real estate and whose new personal income tax excludes real-property gains from its base. And she still wrote a check to California — years after leaving, on a property she no longer owned in a state she no longer lived in.
That is the clawback working exactly as designed. California's claim was never based on where she lived or where the replacement property sat. It was based on where the original gain accrued, and that never changed. Washington's zero-tax environment did nothing to shield the California-source portion — it only protected the post-exchange appreciation, and only because she was a nonresident when she sold.
And here is the resident-credit point from earlier, made concrete: because Washington imposed no tax on the sale, there was no Washington tax against which to claim a credit, and no Washington tax to reduce her overall burden. She simply paid California directly. A taxpayer who had instead moved to a high-tax state and sold from there would have faced a more complex interplay of resident and source taxation, with a credit smoothing out the overlap. In Washington, there is nothing to smooth — just the clean, unavoidable California bill on the original deferred gain.
What Would Have Changed the Outcome
Several variations are worth noting, because they show how sensitive the result is to facts:
- If she had moved back to California before selling, California would have taxed her entire gain — the original $1,500,000 plus the $800,000 of Washington appreciation — because residents are taxed on worldwide income.
- If she had exchanged again — Tacoma into, say, an Arizona property — the California-source $1,500,000 would have continued to defer and continued to ride the Form 3840 filing, link by link, until a final taxable sale.
- If she had died still owning the Tacoma building, the federal step-up in basis would have eliminated the federal gain, and the deferred California gain treatment would turn on nuanced estate-tax questions that warrant dedicated planning.
- If she had sold the building through an entity rather than directly, Washington's real-estate exemption would require a careful look at the capital gains tax's look-through rules for sales of entity interests — a different analysis than the clean direct-sale exemption used here.
Practical Guidance for the Interstate Exchanger
The case study distills into a set of principles that apply well beyond the California-to-Washington route:
The deferral is federal and near-universal; the source claim is local and, in a few states, permanent. Do not assume that leaving a state ends its interest in your gain. In California, Oregon, Massachusetts, and Montana, it does not.
Identify the clawback obligation before you close, not after. The withholding forms have hard pre-closing deadlines, and the annual filing obligation begins in the year of the exchange. A qualified intermediary who handles westbound exchanges should be flagging the Form 3840 or OR-24 requirement as part of setting up the exchange — not leaving you to discover it when the FTB's matching system does.
Track the deferred figure and file every year. The single most common failure is not the tax itself but the lapse in annual filing that triggers an estimated assessment. The deferred gain number is fixed at the exchange; the filing that reports it is not optional and does not end until a recognition event.
Residency at the final sale is a planning variable, not an afterthought. Whether you are a resident or nonresident of the source state when you finally sell can change your bill by hundreds of thousands of dollars. That is a decision to make with your CPA and attorney well before you list the replacement property.
A destination state's own tax regime shelters future appreciation, not the original deferred gain. Washington (whose capital gains excise tax exempts real estate outright, and whose new high-earner income tax deducts long-term capital gains), Nevada, Texas, Florida, and similar low- and no-income-tax states are excellent places to hold replacement property — the appreciation you earn there largely escapes state income tax if you are a nonresident of the source state. But the gain you carried in from California or Oregon comes with strings that the destination state cannot cut.
Interstate 1031 exchanges are among the most powerful tools available to a real estate investor, and moving equity from a high-tax state into Washington is one of the most common and sensible moves a Puget Sound investor can make. But the exchange does not sever the tax history of the property you left behind. The gain that accrued in California or Oregon remains sourced there, tracked there, and taxable there when you finally recognize it — no matter where you have moved or where the replacement property sits.
If you are contemplating an exchange out of a clawback state into Tacoma, Pierce County, or anywhere in the greater Puget Sound region, contact Olympic Exchange Accommodators. As an attorney-led qualified intermediary, we coordinate the state-specific withholding, sourcing, and annual filing obligations alongside the federal exchange mechanics — so the deferral works the way it should, and the surprises are the pleasant kind.
Jeff Helsdon is a Certified Exchange Specialist® who has been facilitating tax-deferred like-kind exchanges since 1990. He is the principal of Olympic Exchange Accommodators in Tacoma, Washington, serving investors throughout Pierce County, the Puget Sound region, and Washington State.
Disclaimer: This article is for informational purposes only and does not constitute legal, tax, or financial advice. Every exchange has unique facts and circumstances, and state tax law changes over time. Consult your own attorney, CPA, and financial advisor before making decisions about your 1031 exchange.
