The September disaster-tax law changes loss deductions and wildfire-payment exclusions: the dates, records and return questions survivors should separate

A September law now controls the new date boundaries

Public Law 119-108, approved September 11, 2026, changes federal tax treatment for certain personal disaster losses and qualifying wildfire relief payments. The law is enacted, rather than a proposal awaiting a vote. For someone preparing or reviewing a return, the most important first step is to identify which provision may be relevant. A casualty-loss deduction, an exclusion for a wildfire payment and a postponed filing deadline are different kinds of relief. They do not share one universal eligibility test.

The new law also creates a source-timing problem. The IRS’s retrieved 2025 Publication 547 and Form 4684 instructions predate the September 2026 changes and still contain older cutoff language. Those publications remain useful for records, basis, reimbursements and procedural context, but their old date limits should not override the enacted statute. This guide uses the statutory text for the new boundaries and labels the IRS references according to the narrower purpose for which they are being used.

The casualty provision focuses on a major disaster’s incident period and the place where the loss arose. The wildfire exclusion focuses on the date of the federal declaration and the character of the payment. Filing postponements come from event-specific IRS relief notices. A person can need to investigate more than one of these routes, but evidence that supports one does not automatically settle the others. For example, having more time to file does not itself prove that every property loss is deductible.

This article is a records-and-questions guide, not an individual tax calculation. It does not know whether a property is within a qualifying area, how the property was used, what insurance may pay or which return has already been filed. The interactive examples use predefined fictional facts. Their purpose is to show which date or document matters next, while preserving uncertainty where a qualified tax professional needs to review the actual case.

Public Law 119-108: enacted statutory text, IRS Topic 515: casualty and disaster-loss mechanics, IRS Publication 547: records and loss calculations, IRS Form 4684 instructions, IRS disaster-relief notices and official event guidance

For the loss provision, check when the incident period began

The new casualty rule defines a qualifying disaster area through a presidential major-disaster declaration under section 401 of the Stafford Act. The incident period for that disaster must begin on or after December 28, 2019 and before January 1, 2027. The incident period is the period specified by FEMA. This is not simply the date a homeowner noticed damage, filed an insurance claim or received a declaration announcement. Obtain the official disaster identification and incident-period information before comparing dates.

The loss must arise in the qualified disaster area on or after the first day of that incident period and be attributable to the disaster. A date inside the window is therefore one part of the test, not a complete determination. A storm name, a nearby county or a general news description does not establish that a particular property and loss meet the statutory requirements. The preparer needs the location, event and connection between the event and the documented loss.

The casualty amendments apply to tax years beginning after December 31, 2024. For a typical calendar-year individual return, that points to 2025 and later tax years, subject to the applicable rules. The event window reaching back to 2019 does not mean every earlier return automatically changes under this new effective-date provision. Keep the incident-period date separate from the tax year on which a loss would be claimed. A prior-year election can make that distinction particularly important.

For qualifying net disaster losses, the special treatment includes a $500 per-event reduction rather than the ordinary personal-casualty floor, removal of the usual 10%-of-adjusted-gross-income limitation for the qualified net loss and a route for eligible nonitemizers to deduct that loss. These are features of a tax calculation with other conditions, including treatment of casualty gains. They are not cash grants. Someone using the standard deduction should investigate the provision rather than assume that not itemizing ends the inquiry.

Public Law 119-108: enacted statutory text, House Ways and Means: enacted-law summary

The tax loss starts with basis and value, not the rebuilding invoice

IRS casualty-loss guidance generally begins a personal-use property calculation with the smaller of the property’s adjusted basis or its decline in fair market value from the casualty. Reimbursements then matter. A repair invoice can be relevant evidence in appropriate circumstances, but it is not automatically the deductible amount. Replacement cost, the amount originally paid and the current market value can all differ. A qualified preparer should explain which figure is being used and what documents support it.

Consider a fictional personal-use item with $30,000 adjusted basis, a $20,000 casualty-related decline in value and $5,000 reimbursement. The smaller starting figure is $20,000. Subtracting the reimbursement leaves $15,000; applying the $500 event reduction leaves $14,500 in this simplified qualifying-loss illustration. It assumes the event and tax year qualify, no casualty gains complicate the calculation and the reimbursement amount is settled. It is a deduction illustration, not a $14,500 refund or a prediction of the tax saved.

Change only the adjusted basis to $12,000 while keeping the same $20,000 value decline and $5,000 reimbursement. The starting figure becomes $12,000, leaving $7,000 before the event reduction and $6,500 afterward. That contrast explains why a large rebuilding bill cannot settle the deduction. The basis limitation can change the result substantially even when the visible damage looks the same. Real calculations can involve multiple items, shared events, gains and other rules omitted from this deliberately narrow teaching example.

Insurance and other recovery prospects affect both amount and timing. IRS guidance discusses claims and a reasonable prospect of reimbursement; an unresolved claim may prevent treating a number as a final deductible loss. A later recovery can also require additional tax treatment. Keep the claim, insurer correspondence, payments and unresolved amounts together. Do not use the largest possible loss today while ignoring a pending reimbursement merely because the new statute expanded the qualifying event window.

For property covered by insurance, timely claim filing can matter to the deductible-loss analysis. IRS guidance explains that the insured portion generally requires a timely insurance claim; failing to pursue an available recovery is not a shortcut to a larger tax deduction. Ask the insurer about the claim process and the preparer about the tax consequence, since they answer different questions. Preserve proof of the claim and any denial or unresolved coverage issue. The tax-law event window does not replace an insurance-policy deadline.

IRS Topic 515: casualty and disaster-loss mechanics, IRS Publication 547: records and loss calculations, Public Law 119-108: enacted statutory text

For the exclusion, the declaration date and payment character matter

The wildfire provision uses a different date test. A qualifying wildfire disaster is a federally declared disaster resulting from a forest or range fire, declared after December 31, 2014 and before January 1, 2027. The statutory test is the declaration date, not the casualty provision’s incident-period beginning. A guide that uses one shared date picker for both rules can reach the wrong conclusion even when it handles the calendar correctly. The official event record should identify which date is being checked.

The new exclusion applies to payments received in tax years beginning after December 31, 2025. For a typical calendar-year individual, that means 2026 and later. The new section does not include an end date for receiving the payment. December 31, 2026 is the end of the qualifying declaration window, not a universal deadline to receive compensation. Do not import the old publication’s prior receipt cutoff into the new statutory section or assume a later payment is disqualified solely because it arrives after 2026.

Qualifying payments compensate an individual for losses, expenses or damages caused by the qualifying wildfire, but only to the extent those amounts are not compensated by insurance or otherwise. The law lists categories including additional living expenses, certain lost wages, personal injury, death and emotional distress. The label on a settlement or check is not enough to establish that all components qualify. Bring the actual agreement, allocation and payment record to the preparer so each component can be examined under the statute.

The lost-wage language has an important exception: compensation paid by the employer that otherwise would have paid those wages is excluded from the qualifying category. The law also denies duplicate tax benefits for expenditures covered by excluded amounts and prevents an increase in property basis from those excluded amounts. A person should not treat a payment as tax-free and then separately claim the same covered expenditure for a deduction, credit or basis increase. Coordination with insurance, prior deductions and the payment’s allocation needs individual review.

Public Law 119-108: enacted statutory text, House Ways and Means: enacted-law summary, IRS Publication 547: records and loss calculations

Keep property losses and compensation in a traceable record

A useful disaster-tax record separates the event from the property and the recovery. The event file identifies the official disaster, affected area and relevant dates. The property file explains ownership, use, adjusted basis and evidence of the casualty-related value change. The recovery file records insurance claims, settlement documents, other compensation and what remains pending. These are practical categories for discussion with a preparer; they do not replace the specific substantiation rules or establish that every available document is sufficient.

Personal-use property should be separated from rental or business property and from property with mixed use. The simplified ledger in this article is limited to personal-use losses. Different parts of Form 4684 and other tax rules may apply to business or income-producing property. A house with a rental unit, a home business or property held through a separate entity needs more analysis than selecting a single homeowner label. Tell the preparer how each part was actually used rather than treating the entire property as one undifferentiated loss.

For wildfire compensation, preserve the document explaining what the payment covers and when it was received. An agreement can include several categories with different tax questions. Keep any associated information return, correspondence about an allocation and records of overlapping insurance or other assistance. If a tax form appears inconsistent with the intended treatment, ask the preparer how to address that discrepancy. Do not assume either that the form automatically decides the legal result or that it can be ignored without a reporting explanation.

A prior deduction or later reimbursement belongs in the same discussion. The preparer may need an earlier return to understand what was already claimed and whether a later recovery changes the result. Keeping a clear sequence of dates and amounts is more useful than presenting an isolated check or repair receipt. This guide never asks readers to upload those documents. Store them securely and share them only through the professional’s appropriate process, with unrelated sensitive information omitted where possible.

A document list can also reveal a disagreement that needs resolution before filing. For example, an insurer’s payment may cover several items while a repair estimate groups them differently, or a settlement may describe a loss category differently from an information return. Ask the preparer which allocation is supported and what clarification is needed. Do not rewrite the underlying documents or invent a convenient allocation to match the desired tax result. The objective is a consistent explanation grounded in the actual records and applicable rules.

IRS Topic 515: casualty and disaster-loss mechanics, IRS Publication 547: records and loss calculations, IRS Form 4684 instructions, Public Law 119-108: enacted statutory text

An unfiled return, an amended return and an election are different decisions

If a relevant return has not been filed, ask the preparer to review the new statute together with the current form instructions and any IRS implementation updates. An older software screen or worksheet may not by itself resolve the newer effective-date rules. The question is how the law applies to the actual event, property and tax year, not simply whether the software offers a disaster checkbox. Keep any approaching filing or payment deadline visible while the calculation is reviewed.

If a return has already been filed, a review may identify whether an amendment is appropriate, but the new law does not mean every survivor should amend automatically. The original treatment, effective tax year, available records, reimbursement status and any applicable limitation period matter. Ask what specific change would be made and why it is permitted. A preparer should be able to explain the connection between the new rule and the filed return before a reader assumes an additional refund is available.

Federal disaster-loss rules can allow an election to claim an eligible loss on the preceding year’s return. IRS guidance generally describes an election deadline six months after the original regular due date for the disaster-year return, without extensions, while event-specific relief may affect relevant deadlines. That is not a universal October 15 deadline for every person or disaster. Confirm the taxpayer’s year, the type of election, any postponement and the current procedural instructions before deciding when action is required.

The September casualty amendments apply to tax years beginning after 2024. A loss elected onto a 2024 return therefore raises a separate effective-date question that this guide does not answer. Do not assume the new 2025-onward treatment follows the loss onto an earlier return unchanged. Have the preparer compare the applicable law and consequences for each potential year, including any prior provisions. Choosing a year can affect the result and the required process; it is not merely a faster way to claim the same number.

Ask the preparer to separate the size of a possible deduction from its actual effect on the return. A deduction reduces the relevant taxable amount under the applicable rules; it is not a check equal to the loss. The result can depend on the rest of the return and on interactions this guide does not model. A useful review explains the statutory treatment, the reporting year and the expected return change separately, with any remaining factual uncertainty identified before a filing decision is made.

Public Law 119-108: enacted statutory text, IRS Topic 515: casualty and disaster-loss mechanics, IRS disaster-victim FAQs: elections and deadlines, IRS Form 4684 instructions

A disaster boundary is not a universal filing deadline

December 31, 2026 appears prominently in the new law’s event windows, but it should not be placed on a calendar as the deadline for every return, insurance claim or wildfire payment. For casualty treatment, the relevant boundary concerns the incident-period beginning. For the wildfire exclusion, it concerns the declaration date. Actual filing and payment postponements depend on the IRS notice for the event and the taxpayer’s circumstances. Read that notice for the affected areas, covered obligations and specified dates.

The IRS disaster-relief hub is the official starting point for those event-specific notices. An announcement about postponing returns or tax payments does not necessarily address every election, information filing or other procedural step a person might have in mind. Ask the preparer to identify the exact obligation and applicable relief. Do not assume that an extension of time to file, a disaster postponement and an election period are interchangeable labels for one deadline.

State tax treatment is a separate check. A federal exclusion or deduction does not by itself establish how a state return conforms to the new federal law. The relevant state, tax year and payment or loss category matter. If a preparer handles both returns, ask for that comparison explicitly. A household that moved after a disaster may need to explain the timing and affected jurisdictions rather than assume the federal answer settles every return it must consider.

Public Law 119-108: enacted statutory text, IRS disaster-relief notices and official event guidance, IRS disaster-victim FAQs: elections and deadlines

Bring a bounded question to the preparer

The note below connects the selected relief question, fictional date example, record status and loss illustration. It deliberately stops short of an eligibility verdict. A date inside a statutory window only identifies one threshold; it does not verify the disaster area, causation, property basis, payment character or reporting year. If the selections mix a casualty incident date with a wildfire declaration test, the guide flags the mismatch rather than silently applying the wrong boundary.

The answer can change when an official date is corrected, insurance is resolved, a payment allocation becomes clear, property use is identified or the relevant return year differs. Sources were checked October 4, 2026. Use the enacted law for the new date rules, current IRS guidance for implementation and a qualified preparer for the actual return. The immediate goal is a complete, traceable question about the right provision, supported by records, rather than a promised deduction or refund.

Public Law 119-108: enacted statutory text, IRS Topic 515: casualty and disaster-loss mechanics, IRS disaster-relief notices and official event guidance