For a 2025 federal return, most personal casualty and theft losses are deductible only if they are tied to a federally declared disaster. To claim an eligible loss, determine which rules apply to your property and event, subtract insurance and other recoveries, calculate the allowable amount on Form 4684, and report it on the appropriate part of your return. Special rules apply to qualified disaster losses, business or income-producing property, and certain thefts connected with profit-seeking transactions.
This guide reflects the IRS’s 2025 instructions and publications accessed October 8, 2026. Check the instructions for the tax year you are filing; disaster relief rules and forms can change.
First check whether your loss can qualify
The federal tax treatment depends on the kind of property, what happened, where and when it happened, and whether you can recover the loss. A storm, fire, accident, fraud, or theft does not automatically create a deductible personal loss.
Personal-use property
For tax years beginning after 2017, an individual’s personal-use casualty or theft loss is generally deductible only when attributable to a federally declared disaster. A federal declaration is a presidential declaration of a major disaster or emergency under the Stafford Act; a local emergency declaration alone is not enough. The affected location must also fall within the relevant declaration area. Check FEMA’s declaration information for the event and locality, and use the assigned DR or EM number when reporting an eligible disaster loss. The IRS explains these rules in Publication 547 and the 2025 Instructions for Form 4684.
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The IRS describes a casualty as property damage, destruction, or loss caused by an identifiable event that is sudden, unexpected, or unusual. A theft generally means an illegal taking with criminal intent under applicable law; a criminal conviction is not required. Misplacing property, ordinary breakage, and gradual deterioration do not meet the cited IRS definition of a casualty loss.
Business, income-producing, and mixed-use property
Business and income-producing property follow different rules from personal-use property. The post-2017 restriction and the personal-use $100 and 10%-of-AGI reductions discussed below do not simply apply to the business portion. If property had both personal and business or income-producing use, allocate the loss between those uses and calculate each portion under its applicable rules. The IRS’s Form 4684 instructions use Section A for personal-use property and Section B for business or income-producing property.
Personal losses that may still matter without a federal disaster
A personal casualty or theft loss that is not tied to a federal disaster generally cannot be claimed as an individual deduction under the ordinary rules. However, personal casualty losses may offset personal casualty gains to the extent allowed by the rules. Theft losses from a transaction entered into for profit may also remain deductible under separate rules. These exceptions do not make an otherwise ineligible personal loss generally deductible; see Publication 547 and the Form 4684 instructions for the applicable treatment.
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Calculate the loss after accounting for recovery
For each item or event, begin with the applicable tax basis and fair-market-value rules. In general, the casualty loss is measured using the smaller applicable amount based on the property’s adjusted basis or the decrease in fair market value. Then account for salvage value, insurance, and other reimbursements. The result is not necessarily the amount of damage, repair cost, or insurance claim.
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- Track insurance claims, settlements, salvage value, and other possible recoveries. If recovery remains reasonably possible, the uncertain portion may not be treated as sustained until the recovery is resolved with reasonable certainty.
- File a timely insurance claim where appropriate. The IRS says failing to file a timely claim can prevent you from deducting the full unrecovered amount; only the portion not covered under the policy may potentially qualify.
- For a theft, keep the discovery date and any available law-enforcement or recovery records. A pending insurance or other recovery claim can affect when the loss is treated as sustained.
- Record how the property was used, especially if it was mixed-use. A practical recordkeeping aid is IRS Publication 584, the personal-use property casualty, disaster, and theft workbook; IRS Topic No. 515 advises keeping the workbook with tax records.
Safe-harbor valuation methods may be available for certain personal-use residential real property and belongings. Follow the current IRS guidance for the relevant property and event rather than assuming a repair estimate or market-value method is acceptable in every case. See Publication 547 and IRS Topic No. 515.
Apply the correct reduction and AGI rule
After calculating eligible personal-use losses and netting recoveries, determine whether ordinary federal-disaster rules or the special qualified-disaster rules apply. They use different reductions.
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| Personal-loss treatment | Reduction and limit | How it is generally reported |
|---|---|---|
| Ordinary qualifying federal-disaster loss | Reduce each casualty or theft event by $100, then reduce the total eligible losses by 10% of adjusted gross income. The $100 reduction applies once per event, not once per damaged item. | Generally reported on Form 4684 and, if allowable, Schedule A as an itemized deduction. |
| Qualified disaster loss | Use a $500 reduction instead of $100 per event; the 10%-of-AGI reduction does not apply. | May qualify for special treatment that allows a deduction without itemizing, subject to current form instructions. |
Personal casualty gains also affect the calculation: non-federal-disaster personal losses may offset personal casualty gains to the extent allowed, and remaining gains reduce deductible federal-disaster losses. The IRS instructions explain the ordering and computation in Form 4684 and Publication 547.
What counts as a qualified disaster loss for 2025
“Qualified disaster loss” is a specific statutory category, not another name for every recent federally declared disaster. The 2025 Form 4684 instructions include listed earlier disasters and certain major disasters declared from January 1, 2020 through September 2, 2025, subject to incident-period conditions: the incident period must have begun on or after December 28, 2019 and on or before July 4, 2025, and ended no later than August 3, 2025. A major disaster declared only by reason of COVID-19 is excluded. Confirm that the named event meets the current definition in the 2025 Form 4684 instructions before using the $500 reduction or non-itemizing treatment.
Report the loss on Form 4684
Form 4684 is the main federal form for reporting casualty and theft gains and losses. Complete the section that matches the property use, attach the form to the return, and follow its transfer instructions for the allowable amount.
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- Identify the event and property. Record the casualty date or theft discovery date, the property affected, and whether it was personal-use, business, income-producing, or mixed-use.
- Verify disaster eligibility. For a potential personal-use disaster loss, confirm the federal declaration and that the locality is included. Note the FEMA DR or EM number and determine whether the event also meets the narrower qualified-disaster definition.
- Establish the amount sustained. Apply the applicable basis and fair-market-value rules, subtract insurance, salvage, and other recoveries, and wait to treat a reasonably possible recovery as final until it is resolved with reasonable certainty.
- Calculate the allowable loss. Apply the correct event reduction, AGI limitation, and personal casualty gain rules. Keep personal-use and business or income-producing portions separate.
- Complete and attach Form 4684. Use Section A for personal-use property and Section B for business or income-producing property. Transfer the result as directed by the form instructions; depending on the case, this may involve Schedule A, Schedule D, or a business form.
- Choose the tax year. A qualifying disaster-area loss may generally be claimed in the disaster year or elected onto the immediately preceding year’s original or amended return. Compare the year-by-year effect and verify the election deadline and any applicable postponement before filing.
For the precise form lines and transfer steps, use the instructions for the return year you are filing. The IRS states the core reporting purpose directly: “Use Form 4684 to report gains and losses from casualties and thefts.” See the 2025 Instructions for Form 4684.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose the year: disaster-year return or prior-year election
A casualty or theft loss is generally claimed in the year it is sustained. For theft, that is generally when the theft is discovered, subject to uncertainty about reimbursement. An eligible disaster-area loss may instead be elected on the immediately preceding year’s return or amended return. This choice can change which tax year receives the deduction; it does not change whether the loss meets the eligibility and calculation rules.
| Choice | What it means | What to check |
|---|---|---|
| Claim in the disaster year | Report the sustained loss on the return for the year the disaster loss occurred. | Confirm the amount is sufficiently established after insurance or other recovery, and apply the correct deduction rules for that year. |
| Elect the immediately preceding year | Claim an eligible disaster-area loss on the prior year’s original return or by amending that return. | Check the statutory election deadline and any disaster-related postponement; compare the prior-year and disaster-year tax effects. |
Under the IRS’s 2025 Publication 547, the election generally must be made by six months after the regular due date, without extensions, for the original return for the disaster year. For a calendar-year taxpayer with a 2025 loss, the publication gives October 15, 2026 as the deadline to amend the 2024 return. Verify the deadline for your circumstances, including any special postponement, in Publication 547.
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Records to keep and when to get help
Keep a file that lets you explain how you owned or used the property, what happened, how you valued the loss, what you recovered or may still recover, and why the event qualifies. Depending on the facts, useful records include:
- Proof of ownership and basis, including purchase records and prior improvements.
- Photos, inventories, repair estimates, and evidence of the property’s condition before and after the event.
- Insurance claims, policy information, settlement statements, salvage amounts, and documentation of other reimbursements.
- For a theft, the discovery date and available incident or law-enforcement details.
- The FEMA declaration number and records showing that the property’s location was included in the designated area.
- Records separating personal use from business or income-producing use.
Not every item is mandatory in every case, but the records should support the figures and eligibility reported on the return. Consult the relevant IRS instructions or a qualified tax professional if you have mixed-use property, disputed valuation, uncertain disaster status, a financial scam or profit-seeking transaction, an amended-return election, or complex insurance and recovery issues. For a return other than 2025, use that year’s IRS materials rather than assuming the thresholds or qualified-disaster definition are unchanged.
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