How Do I Claim Disaster Relief on My Tax Return?

To claim disaster relief on your tax return, you calculate your loss on Form 4684 and carry the deductible amount to your Form 1040. The loss has to come from a federally declared disaster, and before it reduces your taxes it gets trimmed by any insurance you received or expect to receive, a $100 per-event floor, and (for most disasters) 10% of your adjusted gross income. You can claim the loss on the return for the year the disaster happened, or elect to put it on the prior year’s return for a faster refund.

Which Losses Actually Qualify

Since 2018, a personal casualty loss is deductible only when it results from a federally declared disaster.¹ That means the President has formally determined under the Stafford Act that the damage warrants federal assistance beyond what state and local governments can handle.² A storm, flood, wildfire, tornado, or earthquake without a presidential declaration doesn’t qualify. Business property follows separate rules and stays deductible without a declaration.

The damage also has to be sudden. The IRS defines a deductible casualty as property damage from an event that is swift, unexpected, or unusual. Gradual deterioration is out: termite damage, mold from a slow leak, erosion over time, and most drought losses do not qualify because they build up rather than happen at once.³ A narrow exception exists for sudden, unexpected insect infestations, such as a beetle swarm that destroys trees overnight.

Confirm that your specific county sits inside the declaration’s geographic footprint. FEMA lists each declared disaster with its eligible counties. Being in the same state as a declared disaster is not enough.

What You Need Before Opening Form 4684

Pulling records together before you start the form saves rework and reduces the chance of an error that triggers IRS review.

FEMA Declaration Number

Every federally declared disaster has a designation from FEMA: “DR” plus four digits for a major disaster declaration, or “EM” plus four digits for an emergency. You enter this number in the space above Line 1 on Form 4684.⁴ FEMA.gov/Disaster lists the number for each declaration alongside its covered counties.

Cost Basis

Your cost basis is what you paid for the property plus any improvements. For a home, that means the purchase price plus additions like a new roof, remodeled kitchen, or added rooms. Purchase contracts, closing statements, and receipts for major renovations all support the number.⁵ For furniture, electronics, and other belongings, receipts or credit card statements work.

Fair Market Value Before and After

You need what the property was worth immediately before the disaster and immediately after. The difference is the decrease in fair market value and forms the core of the loss calculation.⁶ The IRS generally expects a competent appraisal to support these values, from an appraiser familiar with your property and with comparable sales in the area.³ The appraisal fee itself is not part of the loss; it’s an expense of figuring your taxes.

Safe Harbor Shortcuts

Full appraisals get expensive and hard to schedule when a whole region needs one at the same time. Revenue Procedure 2018-08 offers IRS-approved shortcuts:⁷

Estimated repair cost method: two itemized estimates from separate licensed contractors, using the lower figure. Available for losses of $20,000 or less before applying the floor and AGI threshold.
De minimis method: for losses of $5,000 or less, your own good-faith estimate with documentation of how you got there.
Insurance method: the loss estimate from your homeowner’s or flood insurer’s damage report.
Contractor method (federally declared disasters only): the price in a binding, signed repair contract with a licensed contractor.
Disaster loan appraisal method (federally declared disasters only): the loss estimate from an appraisal prepared for a federal disaster loan application, such as an SBA loan.

Each method requires that estimates cover restoration to pre-disaster condition only. Upgrades that push the property above its pre-disaster value have to be stripped out.

Insurance and Other Reimbursements

Insurance payments, FEMA grants, and other reimbursements that must be used to repair or replace the damaged property reduce your loss dollar for dollar.⁶ Report the total on Line 3 of Form 4684, including amounts you expect even if the claim is still pending. General disaster relief that isn’t tied to specific property, such as food or temporary housing assistance, does not reduce your loss.

Handling a Pending Insurance Claim

This is where taxpayers most often trip up. If you’ve filed an insurance claim and there’s a reasonable chance you’ll be reimbursed, the IRS treats that portion of the loss as not yet sustained. You only deduct the portion you’re reasonably certain won’t be covered.³

If your insurer later pays less than you expected, you claim the unreimbursed portion in the year you learn the claim was denied or reduced, not the disaster year. Deducting the full pre-insurance amount upfront is a common audit trigger.

Filling Out Form 4684

The form has two main sections. Section A covers personal-use property (your home, car, and belongings). Section B covers business and income-producing property and involves depreciation rules.¹ Most disaster-affected individuals use Section A. If part of the damaged property was a rental or home office, you’d split the loss between the two sections.

In Section A, you complete Lines 1 through 12 for each damaged item or group of items:

Line 5: fair market value immediately before the disaster.
Line 6: fair market value immediately after.
Line 7: the decrease in value (Line 5 minus Line 6).
Line 8: the smaller of your cost basis (Line 4) or the decrease in value (Line 7). If the property was completely destroyed, you generally use basis.
Line 9: subtract insurance and reimbursements.

What survives Line 9 still faces two more reductions.

The $100 Per-Event Floor

Each separate casualty event is reduced by $100. If a hurricane damages your roof and a later flood under a different declaration damages your basement, each event gets its own $100 reduction.³ Small in dollar terms, but the form requires it.

The 10% AGI Threshold

After the $100 floor, add up all your personal casualty losses for the year and subtract 10% of your adjusted gross income. Only the amount above that threshold is deductible.³ At $80,000 of AGI, the first $8,000 of net losses produces no deduction. This threshold wipes out smaller claims, which is why the qualified disaster loss rules below matter.

The surviving amount goes to Schedule A as an itemized deduction. For 2026, the standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly,⁸ so total itemized deductions have to clear the standard deduction to help you, unless your loss qualifies for the treatment described next.

Qualified Disaster Losses Get Better Treatment

A subset of federally declared disaster losses called “qualified disaster losses” is treated more generously. If your loss qualifies:⁹

The per-event floor rises from $100 to $500, but the 10% AGI threshold disappears.
You can deduct the loss without itemizing. It effectively adds to your standard deduction.

The practical gap is large. Someone with $60,000 AGI and a $15,000 net loss under standard rules loses $6,000 to the AGI threshold and deducts $9,000, and only if they itemize. Under qualified disaster loss rules they deduct $14,500 without itemizing.

“Qualified disaster loss” is a defined term with date limits. Under current law it covers losses from major disasters declared between January 1, 2020, and September 2, 2025, with incident periods that began on or after December 28, 2019, and on or before July 4, 2025. COVID-19 declarations are excluded.³ Congress has expanded these windows before, so check the current Form 4684 instructions and Publication 547 for your disaster.

Electing to Claim the Loss on the Prior Year’s Return

You can elect to deduct a federally declared disaster loss on the return for the year before the disaster. A hurricane in 2026 can go on your 2025 return.¹⁰ The refund arrives faster because you’re amending a return you’ve already filed rather than waiting until you file next year.

To make the election, file Form 1040-X for the prior year and attach Form 4684 showing the loss. Form 1040-X can now be filed electronically for tax years 2021 and later, and e-filed amended returns qualify for direct deposit.¹¹

The Election Deadline

The election must be made within six months after the regular due date (without extensions) of the disaster-year return. For most individuals that puts the deadline at October 15 of the year after the disaster. You can revoke the election within 90 days after that date.¹²

Which Year Is Actually Better

Running the numbers both ways matters. If your prior-year income was higher, the deduction offsets income taxed at a higher rate. If your income dropped after the disaster, the current year may be worth more. The speed of a refund via amendment is real, but not always worth a smaller deduction.

Automatic Filing Extensions for Disaster Areas

When a disaster is declared, the IRS automatically extends filing and payment deadlines for taxpayers in the covered area. There’s nothing to apply for; the IRS uses your address of record. If you’re in the disaster zone but your address on file isn’t, call the IRS disaster hotline at 866-562-5227.

The postponement usually covers individual, corporate, partnership, estate and trust, employment, and excise returns, along with estimated tax payments and IRA or HSA contributions. New deadlines vary by disaster; recent postponements have pushed dates out by several months, and multiple 2025 declarations extended deadlines into early 2026.¹³ The extensions cover filing deadlines, not payments that were already due before the disaster period began.

When Insurance Pays More Than Your Basis

Not every disaster outcome is a loss on paper. If insurance pays more than your adjusted basis in the destroyed property, the excess is a taxable casualty gain unless you reinvest. Section 1033 lets you defer the gain by buying replacement property similar in use within the replacement window.¹⁴

The standard replacement period is two years after the close of the first tax year in which you realize any gain. For property destroyed in a federally declared disaster, the window extends to four years.¹⁴ For a principal residence in a disaster area, insurance proceeds for personal belongings that weren’t separately scheduled on your policy don’t trigger gain at all, and all other proceeds for the residence are treated as received for a single item, so you reinvest the total rather than tracing each item. This situation comes up more often than owners expect on homes bought decades ago at low basis but insured at current replacement cost.

Processing Times and Records to Keep

Amended returns generally take 8 to 12 weeks, and the IRS warns some take up to 16.¹⁵ Track status with the IRS “Where’s My Amended Return?” tool or by calling 866-464-2050.

Hold onto your disaster documentation. The general statute of limitations runs three years from filing, but the IRS recommends keeping property-related records until the limitations period expires for the year you dispose of the property.¹⁶ Appraisals, contractor estimates, insurance correspondence, and photos of the damage are worth keeping for at least seven years, particularly for large deductions that are more likely to draw scrutiny.

1
Internal Revenue Service. Form 4684, Casualties and Thefts
2
eCFR. 44 CFR Part 206 – Federal Disaster Assistance
3
Internal Revenue Service. Publication 547 (2025), Casualties, Disasters, and Thefts
4
Internal Revenue Service. Instructions for Form 4684 (2025)
5
Internal Revenue Service. Publication 551 (12/2025), Basis of Assets
6
Internal Revenue Service. 2025 Instructions for Form 4684 – Casualties and Thefts
7
Internal Revenue Service. Revenue Procedure 2018-08
8
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
9
Internal Revenue Service. Topic No. 515, Casualty, Disaster, and Theft Losses
10
Office of the Law Revision Counsel. 26 USC 165 – Losses
11
Internal Revenue Service. Instructions for Form 1040-X
12
eCFR. 26 CFR 1.165-11 – Election to Take Disaster Loss Deduction for Preceding Year
13
Internal Revenue Service. IRS Announces Tax Relief for Taxpayers Impacted by Severe Storms in Texas
14
Office of the Law Revision Counsel. 26 USC 1033 – Involuntary Conversions
15
Internal Revenue Service. Where’s My Amended Return?
16
Internal Revenue Service. How Long Should I Keep Records?