
A casualty loss is a type of tax loss that results from a sudden, unexpected, or unusual event, such as a natural disaster, theft, or accident. It is distinct from normal wear and tear or progressive deterioration. To claim a casualty loss deduction, taxpayers must prove ownership of the property and notify the IRS of any anticipated reimbursements, as the deduction only covers unrecoverable losses. Casualty losses are generally claimed as an itemized deduction on Schedule A of Form 1040 and are subject to specific requirements and limitations.
| Characteristics | Values |
|---|---|
| Definition | Casualty loss is a type of tax loss that is a sudden, unexpected, or unusual event. |
| Examples | Flood, hurricane, tornado, fire, earthquake, volcanic eruption, car accidents, extreme weather, and vandalism. |
| Conditions | The loss must be caused by a federally declared disaster. |
| Deduction | The total amount of a claimed casualty loss cannot exceed a taxpayer’s adjusted tax basis in the property damaged. |
| Tax form | Form 4684. |
| Year of deduction | The year in which the loss happened. |
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What You'll Learn

Personal casualty losses
To claim a casualty loss deduction on your federal income tax, you must prove that you are the rightful owner of the property. You must also notify the IRS of any reimbursement you anticipate receiving from an insurance company or a lawsuit that is likely to result in a monetary settlement. The deduction only covers unrecoverable losses, so you must reduce your deductible loss by the amount of any reimbursement or expected reimbursement.
The total amount of a claimed casualty loss cannot exceed a taxpayer's adjusted tax basis in the property damaged. The deductible amount is typically the lesser of the property's tax basis or the decrease in fair market value due to the casualty. If the property is not completely destroyed, the amount of the casualty loss is the lesser of the decrease in the property's value due to the casualty or the taxpayer's adjusted basis in the property.
For tax years 2018 through 2025, personal casualty losses are generally not deductible unless they are caused by a federally declared disaster. If your loss is part of a presidentially declared disaster, you can deduct the loss on your return for the tax year immediately preceding the year of the loss. Individuals may claim their casualty and theft losses as an itemized deduction on Schedule A (Form 1040).
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Federal casualty losses
The process for claiming a federal casualty loss deduction typically involves completing IRS Form 4684, Casualties and Thefts. This form helps taxpayers calculate and report losses caused by casualties, thefts, or other similar events. It is important to note that taxpayers must also notify the IRS about any anticipated reimbursements, including insurance payouts or expected monetary settlements from lawsuits.
The Tax Cuts and Jobs Act (TCJA) has placed some restrictions on claiming federal casualty loss deductions. From 2018 to 2025, casualty losses to personal property are deductible only if they occur due to a federally declared disaster. This includes both major disaster declarations and emergency declarations made by the President. For losses in federally declared disaster areas, taxpayers can claim deductions retroactively by treating the loss as if it occurred in the previous year and filing an amended tax return.
It is worth mentioning that there are exceptions to the TCJA restrictions. Individual taxpayers may claim casualty losses not due to federally declared disasters to offset casualty gains during the specified period. A casualty gain occurs when the insurance proceeds received by a property owner exceed the value of the damaged or destroyed property for tax purposes. By claiming a casualty loss, taxpayers can reduce the tax liability on the casualty gain.
Additionally, the rules for business property casualty losses differ from those for personal property. The old rules continue to apply, and uninsured losses to business property are deductible as long as they are due to a qualifying casualty event. When business property is involved, the casualty event does not need to be associated with a federal disaster declaration.
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Theft loss
To claim a theft loss deduction, taxpayers must first prove the existence of a theft and the amount of the loss. The amount of the theft loss is generally the adjusted basis of the property because the fair market value of the property immediately after the theft is considered to be zero. Taxpayers should have good books and records or other documentary evidence to reflect the basis and fair market value of the property at the time of the theft.
Additionally, taxpayers must notify the IRS of any reimbursement they anticipate receiving from an insurance company or a lawsuit that is likely to result in a monetary settlement. The theft loss deduction is reduced by the amount of any reimbursement or expected reimbursement.
To claim a theft loss deduction on your federal income tax, you must prove to the IRS that you are the rightful owner of the property. This can be done by providing evidence of ownership, such as receipts or purchase records. It is important to note that for tax years 2018 through 2025, a deduction is generally not available for personal casualty losses, which include losses from casualty, disaster, and theft. However, personal casualty losses relating to federally declared disasters, such as floods, hurricanes, and fires, may be deductible.
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Casualty loss deductions
A casualty loss is a type of tax loss that results from a sudden, unexpected, or unusual event. This includes damage or destruction of property from natural disasters, theft, or accidents. To be eligible for a casualty loss deduction, the loss must not be compensated by insurance or other means, and you must be able to prove ownership of the property.
To claim a casualty loss deduction on your federal income tax return, you must notify the IRS of any anticipated reimbursement from insurance companies or lawsuits. You must also reduce your deductible loss by the expected reimbursement amount, as the deduction only covers unrecoverable losses. The IRS requires you to use the smaller of the property's tax basis or the decrease in fair market value to determine the deductible amount.
For example, if you purchased a vehicle for $25,000, and two years later it is worth $15,000, and you are in an accident that renders the car worthless, your actual loss is the purchase price of $25,000. However, for tax purposes, the loss is only $15,000 since this is the car's fair market value on the day of the accident.
To calculate your casualty loss deduction, you need to determine the adjusted basis of the property before the casualty and subtract any insurance or other reimbursement received or expected. You will also need to provide proof of the casualty or theft, such as reports from media sources or other documentation showing proof of damage or loss.
It is important to note that casualty losses are generally claimed as an itemized deduction on Schedule A of Form 1040. However, there are special provisions for certain types of losses, such as qualified disaster distributions from eligible retirement plans. Additionally, for tax years 2018 to 2025, deductions for personal casualty losses are generally limited to losses within federally declared disaster areas.
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Calculating casualty loss
A casualty loss is a type of tax loss that is sudden, unexpected, or unusual. It can result from the damage, destruction, or loss of property from events such as natural disasters (e.g., flood, hurricane, tornado, fire, earthquake), accidents, or theft. To calculate and claim a casualty loss deduction, there are several steps and considerations to keep in mind:
Proving Ownership and Loss
To claim a casualty loss deduction, you must prove that you are the rightful owner of the property in question. This can be done by providing appropriate documentation and reports that show proof of ownership, damage, or loss.
Reporting and Forms
Casualty and theft losses are reported using IRS Form 4684, which helps determine the amount of deductible loss. This form is then attached to your tax return, typically on Schedule A of Form 1040. For tax years 2018 through 2025, personal casualty and theft losses are generally not deductible unless they are caused by a federally declared disaster.
Adjusted Basis and Fair Market Value
To calculate the deductible amount, you need to determine the adjusted basis of the property before the casualty or theft. The adjusted basis is usually the amount you originally paid for the property. Then, you must figure out the decrease in the fair market value (FMV) of the property resulting from the casualty or theft. The deductible amount is the smaller of these two values.
Insurance and Reimbursements
Any insurance or other reimbursements expected or received must be subtracted from the casualty loss amount. This is because the deduction only covers unrecoverable losses. If your reimbursement exceeds the cost or adjusted basis of the property, you may have a capital gain that needs to be included in your income.
Reductions and Limitations
There are additional reductions and limitations to consider. You must subtract $100 from each casualty or theft event, and the total casualty loss for the year is further reduced by 10% of your adjusted gross income. For personal casualty losses, the deduction is limited to the amount that exceeds personal casualty gains plus 10% of your adjusted gross income.
Timing and Tax Year
Typically, you can deduct losses in the tax year in which they occurred. However, if your loss is part of a presidentially declared disaster, you can deduct it on your return for the tax year immediately preceding the loss. Additionally, if you paid for repairs due to casualty, you can treat those repair amounts as a casualty loss in the year of payment.
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Frequently asked questions
A casualty loss is a type of tax loss that is a sudden, unexpected, or unusual event. This includes damage, destruction, or loss of property.
A casualty loss can result from damage, destruction, or loss of property from a natural disaster (e.g. fire, flood, hurricane), theft, or accident. For tax years 2018-2025, personal casualty losses are not deductible unless caused by a federally declared disaster.
To claim a casualty loss deduction, you must prove ownership of the property and notify the IRS of any anticipated reimbursements. You must also complete IRS Form 4684 and may need to provide additional documentation showing proof of damage or loss.





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