Claiming the Eaton Fire casualty loss on your 2025 return triggers a mandatory basis reduction under IRC §1016 — and that lower basis inflates your §1033 gain in 2027 when Edison settles, potentially past your rebuild cost, creating recognized income that can't be sheltered. Most advisors are not modeling this interaction before recommending the deduction. This post is for Eaton Fire homeowners who have been told to take the loss in 2025 and are planning a §1033 election in 2027.
⚡ Law Updated — March 2026
OBBBA (July 2025): Eaton Fire Is a Qualified Disaster Loss — Federal Floor Eliminated
The One Big Beautiful Bill Act (Pub. L. 119-21, signed July 4, 2025) confirmed the Eaton Fire as a Qualified Disaster Loss. Federal casualty loss rules updated:
• Federal 10% AGI floor: eliminated for qualified disaster losses
• Per-event floor: $500 (down from $100)
• Itemizing not required — casualty loss now available without itemizing
California has NOT conformed to OBBBA. California still applies the 10% AGI floor, the $100 per-event floor, and requires itemizing. Every Eaton Fire client now needs a federal calculation and a California calculation — they will be different numbers.
⚡ Law Updated — March 2026
2026 Payment Cliff: FDTRA Exclusion Expired December 31, 2025
The Federal Disaster Tax Relief Act wildfire payment exclusion expired December 31, 2025 under current law.
2025 payments: FDTRA exclusion may apply — analyze alongside §104 and §1033.
2026+ payments: FDTRA exclusion unavailable. Federal taxability depends entirely on §104 (physical injury allocation) and §1033 (total loss deferral). California payments remain excluded under R&TC §17138.7 through 2029.
The settlement timing decision now has a federal tax dimension it didn't have before. Clients who can settle in 2025 have one more federal tool available. Clients settling in 2026 are working with a shorter federal toolkit — but California is still fully excluded.
These numbers are devastating to you. To us, this is what we do every day.
We make the tax side of this emotionally manageable — so you can focus on rebuilding. One consult. Clear answers. No jargon.
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The day after the fire I heard nothing but cries and saw nothing but tears. Everything was gone. Just gone. Dust. I still can't explain how it got hot enough to melt brick.
Tom didn't come to me first. He had a preparer — someone he'd used for years, trusted completely — and that preparer had filed his 2025 return before Tom and I ever spoke. The preparer had done what felt obvious: Tom lost his home, the tax code allows casualty loss deductions, so he claimed one. Roughly $306,000 deducted. Refund on the way.
Tom called me a few months later because someone in his attorney's office had mentioned the phrase "§1033 election" and he didn't know what it meant. Could I explain it?
I explained it. And then I asked to see the 2025 return.
When I saw the casualty loss claim, I knew we had a problem — two problems, actually. The first was legal: the loss almost certainly wasn't sustained in 2025 while the Edison lawsuit was still active. The second was mechanical, and it's the one that almost nobody talks about.
Taking that $306,000 deduction had reduced Tom's adjusted basis by $306,000 under IRC §1016(a)(1). Which meant his §1033 gain in 2027, when Edison settled, would be $306,000 larger than it should have been. Large enough to spill $26,900 above the rebuild cost — into recognized income the §1033 election couldn't reach.
His preparer had been looking at 2025. I had to show him 2027.
I've started asking every Eaton Fire client the same question in our first meeting: "Did anyone file — or recommend filing — a casualty loss on your 2025 return?" The answers concern me. Some preparers are reflexively recommending the deduction because there was a casualty and the client has a loss on paper. What almost none of them are modeling is what that deduction does to the 2027 §1033 calculation — because the two are connected through your basis, and the connection is mandatory, not optional.
Based on my reading of the code, this is one of the most consequential multi-year planning mistakes in Eaton Fire cases. And it is entirely avoidable.
Does Taking an Eaton Fire Casualty Loss in 2025 Reduce My §1033 Basis in 2027?
Here is where it gets counterintuitive. The answer is yes — and it is not a planning choice. It is a statutory requirement.
Under IRC §1016(a)(1), when you claim a casualty loss deduction, you must reduce your adjusted basis in the property by the amount of the deduction. The IRS does not let you take the loss and keep the full basis. The two are linked. Take the deduction in 2025, your basis drops in 2025. Lower basis in 2025 means lower basis going into the §1033 calculation in 2027.
The Mechanical Chain
Step 1: Claim $306,900 casualty loss on 2025 return
Step 2: §1016(a)(1) reduces adjusted basis by $306,900
Step 3: Edison pays $2M in 2027 — §1033 gain calculated against reduced basis
Step 4: §1033 realized gain is now $306,900 larger than it would have been
Step 5: If the larger gain exceeds the rebuild cost — the excess is recognized and taxable
Let me show you this with real numbers from an Eaton Fire fact pattern I've been working through: $1.03M adjusted basis, $523K insurance, $2M Edison settlement, $1.25M rebuild cost.
| Step | No Loss Taken in 2025 | Loss Taken in 2025 |
|---|
| Starting basis | $1,030,000 | $1,030,000 |
| Casualty deduction (§165) | — | ($306,900) |
| Adjusted basis into 2027 (§1016) | $1,030,000 | $723,100 |
| Edison proceeds (§1033 amount realized) | $2,000,000 | $2,000,000 |
| §1033 realized gain | $970,000 | $1,276,900 |
| Rebuild cost (deferral cap) | $1,250,000 | $1,250,000 |
| Gain recognized (taxable in 2027) | $0 | $26,900 |
Taking the 2025 deduction pushes the §1033 gain from $970,000 to $1,276,900 — which is $26,900 above the rebuild cost. That excess gets recognized as taxable income in 2027. The §1033 election cannot shelter it because the deferral is capped at the rebuild cost.
"Taking the casualty loss in 2025 and doing §1033 in 2027 are not independent decisions. They are connected through your basis. Every dollar of deduction in 2025 becomes a dollar of extra gain in 2027 — and if enough dollars stack up, the gain spills above your rebuild cost and becomes taxable income the §1033 election cannot reach."
If another preparer has already filed the 2025 return with a casualty loss, we need to model the 2027 impact now — not after Edison settles. There may still be time to amend.
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Is It Ever Worth Taking the Eaton Fire Casualty Loss in 2025 If I Plan to Use §1033 in 2027?
What most advisors miss is that the answer is not always no — but it requires modeling both years together, not just looking at 2025 in isolation. Here is the complete two-year picture:
Scenario A — No loss, §1033 clean
2025 taxable income: $200,000
2025 tax: ~$54,000
2027 recognized gain: $0
2027 taxable income: $320,000 (ALE only)
2027 tax: ~$98,000
Total 2025+2027: ~$152,000
Scenario B — Loss in 2025, §1033 in 2027
2025 taxable income: $0 (deduction wipes it out)
2025 tax: $0
2027 recognized gain: $26,900 (spills above rebuild)
2027 taxable income: $346,900
2027 tax: ~$108,000
Total 2025+2027: ~$108,000
The math shows Scenario B is actually about $44,000 cheaper when you look at both years together — because the casualty deduction eliminates all 2025 income, and the $26,900 of recognized gain in 2027 costs less than the 2025 tax it avoided.
But — and this is the critical qualification — this analysis assumes the loss is legally sustainable in 2025. That assumption fails for most Eaton Fire clients.
Why Can't I Take the Eaton Fire Casualty Loss in 2025 If the Edison Lawsuit Is Still Open?
Even if the two-year math favored taking the loss, most Eaton Fire homeowners cannot legally claim it in 2025. The legal gate is the "sustained" standard under IRC §165 and Treas. Reg. §1.165-1(d)(2)(i): a casualty loss is only deductible in the year it is sustained — meaning all claims are settled with no remaining prospect of recovery from any source.
While the Edison lawsuit is active, most Eaton Fire homeowners have a factual prospect of third-party recovery. The code does not require you to have personally retained an attorney or signed a retainer. If you are within the class of potential Edison plaintiffs — and most Eaton Fire property owners are — there is a prospect of recovery that keeps the loss legally open.
Claiming a deduction for a loss that is not yet sustained is an incorrect filing position. If the IRS examines it and the Edison litigation is still active, the deduction is disallowed — and you owe back taxes, interest, and potentially penalties. The basis mechanics we modeled above are not even relevant if the deduction is not legally available in the first place.
This is why I recommend the same posture for most Eaton Fire filers in 2025: an open transaction disclosure. It notifies the IRS that a casualty event occurred, that the matter is not yet concluded, and that you will report the final tax consequence when all proceeds are known. It preserves every option — as detailed in the sustained-loss analysis — without creating an incorrect filing position or a basis problem that compounds in 2027.
Should I Claim the Eaton Fire Casualty Loss on My 2025 Tax Return?
For most Eaton Fire homeowners with a pending Edison settlement: no. Two independent reasons point the same direction.
Reason 1 — Legal: The loss is likely not sustained in 2025 while Edison litigation is active. Claiming it anyway creates audit risk on a position that is hard to defend. If the IRS wins on the sustained-loss argument, the deduction is disallowed and the 2025 return needs to be amended — after the refund has already been spent.
Reason 2 — Mechanical: Even if the legal standard were met, the basis reduction under §1016 inflates the 2027 §1033 gain. With a rebuild cost of $1.25M and a §1033 gain of $970K, there is only $280,000 of margin before the gain spills above the rebuild cost. A $306,900 casualty deduction consumes that margin entirely and creates $26,900 of recognized income in 2027.
The two reasons are independent — either one alone is sufficient to recommend against the deduction. Together, they make the case clearly. The correct 2025 posture for most clients is the open transaction disclosure, not a casualty loss claim. See also the companion post explaining why the Edison settlement may wipe out the casualty loss entirely — which makes the 2025 deduction question moot for many clients in the first place.
Frequently Asked Questions
Does taking an Eaton Fire casualty loss in 2025 reduce my §1033 basis in 2027?
Yes — this is a mandatory adjustment under IRC §1016(a)(1). When you claim a casualty loss deduction, your adjusted basis is reduced by the deduction amount. A lower basis in 2027 means a larger §1033 realized gain when Edison settles. If that larger gain exceeds your rebuild cost, the excess is recognized as taxable income that the §1033 election cannot shelter.
Is it ever worth taking the Eaton Fire casualty loss in 2025 if I plan to use §1033 in 2027?
Sometimes — but only in specific fact patterns where the inflated §1033 gain still falls below the rebuild cost. In that case you keep a time-value benefit. But if the deduction pushes the §1033 gain above the rebuild cost, you create recognized income that wouldn't have existed otherwise. You must model both years with your actual numbers. For most Eaton Fire clients with rebuild costs close to the §1033 gain, the margin is thin enough that the 2025 deduction tips the balance into recognized income.
Why can't I take the Eaton Fire casualty loss in 2025 if the Edison lawsuit is still open?
Under IRC §165, a casualty loss is only deductible when "sustained" — meaning all claims are settled with no reasonable prospect of further recovery. While the Edison lawsuit is active, most Eaton Fire homeowners have a factual prospect of third-party recovery that keeps the loss legally open. Claiming a premature deduction creates audit risk and is likely an incorrect filing position, independent of the basis mechanics.
What is the basis trap in claiming an Eaton Fire casualty loss and then doing a §1033 election?
The trap: (1) you claim a casualty loss deduction in 2025; (2) IRC §1016(a)(1) reduces your adjusted basis by the same amount; (3) in 2027, your §1033 realized gain is that much larger because your basis is lower; (4) if the larger gain exceeds your rebuild cost, the excess is recognized and taxable. The 2025 deduction created taxable income in 2027 that wouldn't have existed if you had held the basis intact.
Should I claim the Eaton Fire casualty loss on my 2025 tax return?
For most Eaton Fire homeowners with a pending Edison settlement: no. Two independent reasons apply. First, the loss is likely not sustained while Edison litigation is active — making the deduction legally premature. Second, the basis reduction under §1016 inflates the 2027 §1033 gain and may create recognized income. The correct approach for most filers is an open transaction disclosure on the 2025 return, preserving all options until Edison settles.
The tax side of this doesn't have to be one more thing that breaks you.
If your 2025 return has already been filed with a casualty loss, the 2027 impact needs to be modeled now — before it's too late to amend. If it hasn't been filed yet, the open transaction disclosure is almost certainly the right posture. One consult maps both years together.
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SALES ASSET ROW:
Problem: My preparer said to take the Eaton Fire casualty loss in 2025 but I'm also planning to use §1033 in 2027 when Edison settles.
Who it's for: Eaton Fire homeowners who have been told by another preparer to claim the casualty loss in 2025 and who have a pending Edison settlement.
Objection destroyed: "My preparer already recommended the deduction so it must be fine" — shows the mandatory basis reduction under §1016 creates a compounding problem in 2027 that most preparers are not modeling.
When to send: Send when a prospect mentions their preparer recommended taking the loss on the 2025 return, or when a client comes in after another preparer has already filed with the deduction.
Email blurb: Most Eaton Fire preparers are recommending the casualty loss deduction in 2025 without modeling what it does to the §1033 calculation in 2027. Taking the deduction triggers a mandatory basis reduction under §1016 — and that lower basis can push the 2027 gain above the rebuild cost, creating taxable income that can't be sheltered. I broke down the two-year math showing exactly what that interaction costs: [link].