Can you deduct car damage on your taxes? The casualty loss rules

Usually not. Since 2018, the federal tax code has allowed an individual to deduct damage to a personal-use car only when a federally declared disaster caused it, and beginning with tax year 2026 a disaster declared by a state governor can also qualify. Even then, the deduction is cut by $100 per event and by 10% of your adjusted gross income, so a single $1,000 deductible almost never produces a tax benefit. A car used in a business follows a different set of rules.

The IRS source for all of this is Publication 547, "Casualties, Disasters, and Thefts." The 2025 edition was last updated by the IRS on April 30, 2026, and the 2026 changes are described on separate IRS pages that this article cites. This is general information, not tax advice: a tax preparer or the IRS can apply the rules to your return.

What the IRS counts as a casualty

For tax purposes, a casualty is damage, destruction or loss of property from an identifiable event that is sudden, unexpected or unusual. Pub. 547 lists car accidents among the events that can qualify, along with storms, floods, fires and similar events. Gradual damage does not count: rust, wear, and progressive deterioration are not casualties, and neither is damage you cause on purpose. The publication says a car accident caused by your willful negligence or a willful act is not deductible.

That definition is only the first gate. After 2017, a personal casualty loss has to pass a second test before it can be deducted at all, and that second test is where most car owners stop.

The disaster-only rule for personal cars

For tax years beginning after 2017, Pub. 547 says casualty and theft losses of personal-use property are deductible only if they are attributable to a federally declared disaster. The IRS calls these "federal casualty losses." A rear-end collision, a hit-and-run, a theft from your driveway or a hailstorm that was not part of a federal declaration does not qualify, no matter how large the repair bill.

There is one narrow exception. If you also had personal casualty gains in the same year, you may deduct non-disaster personal casualty losses up to the amount of those gains. A gain arises when the insurance payment is larger than your tax basis in the property, which is uncommon for a car you bought years ago but possible with replacement-value coverage. For most drivers the exception does not apply.

What changed for 2026

The One Big Beautiful Bill Act (Public Law 119-21) made the personal casualty deduction permanent and widened it. The IRS page "Casualty loss deduction expanded and made permanent" says the deduction is no longer limited solely to federally declared disasters and may include losses from state-declared disasters, as long as the other requirements of Internal Revenue Code section 165 are met. The IRS wildfire-relief FAQ adds the detail that matters for the numbers: beginning in 2026, losses from a disaster declared by a state's governor (or the D.C. mayor) get the same $100 and 10% treatment as federal ones, and they cannot be a "qualified disaster loss," because only the President can declare those.

The 2025 edition of Pub. 547 and the 2025 Form 4684 instructions do not describe the state-declared rule, so for a 2026 loss, check the IRS pages for the current-year forms before relying on the 2025 wording. A storm in November 2026 is a 2026 event, and its deduction generally belongs on the return you file in 2027, unless a disaster-year election described below applies.

The $100 and 10% of AGI reductions

Two subtractions apply to a personal-use loss that qualifies. Pub. 547 sets them out in order:

1. Figure each loss, then subtract insurance and other reimbursements.
2. Subtract $100 for each casualty event. The $100 applies once per event no matter how many items were damaged, and separate events each get their own $100.
3. Add up the remaining losses for the year and subtract 10% of your adjusted gross income (AGI).

For a "qualified disaster loss" from certain major federal disasters declared between January 1, 2020 and September 2, 2025, the rules differ: the 10% reduction does not apply and the per-event reduction rises from $100 to $500, according to Pub. 547. Congress has extended these special rules before, so check IRS.gov for whether a particular disaster qualifies; an ordinary federal or state-declared disaster uses $100 and 10%.

The 10% reduction is what removes most claims. Whether you have a $1,000 deductible or a $5,000 one, you subtract a percentage of your whole income before any deduction appears. A household with $60,000 of AGI has a $6,000 floor; the car loss has to clear it, together with any other qualifying casualty losses that year, before it produces anything.

How the loss is measured, and why insurance matters

The size of the loss is not what you paid for the repair, and it is not the replacement cost. For personal-use property, Pub. 547 says the loss is the smaller of two numbers: your adjusted basis (generally what you paid, adjusted for later changes) or the decrease in fair market value, which is the value just before the casualty minus the value just after. That is then reduced by any insurance or other reimbursement you received or expect to receive.

The decrease in fair market value for a totaled car is close to the car's pre-loss market value, which is why the actual cash value an insurer calculates and the tax loss are cousins but not the same figure. The IRS says to use automobile valuation books adjusted for mileage and condition, and notes that a dealer's trade-in offer is usually not a measure of true value. Replacement cost, sentimental value, the cost of protecting property and the cost of photos or appraisals are not part of the loss.

You must claim what insurance covers

This is the rule that catches people who skip a small claim to protect their premium. Pub. 547 says that if your property is covered by insurance, you should file a timely claim. If you do not, you cannot deduct the full unrecovered amount: only the part of the loss that the policy does not cover is deductible. The deductible itself is the part the policy never covers, so it remains eligible. The publication gives a car example: a policy with comprehensive coverage and a $1,000 deductible, a storm, and the $1,000 deductible is deductible subject to the $100 and 10% rules, even if you never file a claim.

The practical reading: you cannot choose not to claim in order to deduct a bigger repair bill on your return. If you will not claim, the most the tax code can ever recognize is the portion your policy would not have paid.

When the other driver's insurer might still pay

Reimbursement timing can push a loss into a later year. Pub. 547 says that if there is a claim with a reasonable prospect of recovery in the year of the casualty, the loss is not sustained until you know with reasonable certainty whether you will be reimbursed. Its example is a personal car destroyed by another driver's negligence, with a reasonable prospect of collecting at year-end; when it later became clear in the next year that the money could not be collected, the loss was treated as sustained that year. Your own insurer can also pursue the at-fault party for the money it paid, which is a separate matter from your tax return.

Worked examples with made-up numbers

The figures below are hypothetical and chosen for arithmetic, not market data.

Example 1: the $1,000 deductible

Say a hailstorm that is part of a federally declared disaster dents your car. Your comprehensive claim is approved and you pay a $1,000 deductible. Your AGI is $60,000.

• Loss after insurance: $1,000 (the deductible, since insurance paid the rest)
• Minus $100 per event: $900
• Minus 10% of AGI ($6,000): below zero, so the deduction is $0

The deductible produces no tax savings, because the 10% reduction is more than six times the loss. If the same driver also lost a roof, a fence and other property in the same disaster, those losses combine with the car for the 10% test, which is how a household with a larger total loss can end up with a deduction.

Example 2: a flooded car with no comprehensive coverage

Say a federally declared flood destroys a car you bought for $22,000 that was worth $14,000 just before the flood and is worth nothing afterward, and you carried only liability insurance. Your AGI is $60,000.

• Smaller of basis ($22,000) or decrease in value ($14,000): $14,000
• Minus insurance: $0, so the loss stays at $14,000
• Minus $100: $13,900
• Minus 10% of AGI ($6,000): $7,900

A $7,900 deduction goes on the return only if you itemize, and it helps only to the extent your itemized deductions beat the standard deduction. The point is the contrast: the large uninsured loss can matter, while the insured driver in Example 1 has nothing.

Example 3: a rear-end crash

An ordinary at-fault or not-at-fault collision with no disaster declaration produces no deduction at all, however large the loss. The right recovery path is insurance, either yours or the other driver's. For how the deductible works in that case, see how the deductible is applied to a repair claim, step by step and claims just above your deductible: the true cost of filing.

Form 4684: the mechanics

Report a casualty or theft on Form 4684. The 2025 Form 4684 instructions split the form into sections. Section A covers personal-use property, Section B business and income-producing property. In Section A, the main entries are:

1. Your cost or other basis (line 2).
2. Insurance or other reimbursement (line 3). The instructions say to include your insurance coverage whether or not you are filing a claim.
3. The fair market value of the property immediately before the casualty (line 5) and immediately after (line 6). The instructions note that replacement cost is not necessarily fair market value.
4. The smaller of basis or decrease in value, less reimbursement, then the $100 and 10% reductions, with the result carried to Schedule A (Form 1040) as an itemized deduction.

Where the insurance payment is more than your basis, the form computes a gain on the reimbursement, and the instructions say not to enter less than zero on that line. The form is filed with your Form 1040. Because it is an itemized deduction, it helps only if your itemized deductions, with the casualty loss included, come to more than your standard deduction; Pub. 547 makes the same point for people amending a return they filed without itemizing.

Claiming a disaster loss on last year's return

For a loss in a federally declared disaster area, Pub. 547 lets you elect to deduct it on the return for the year before the disaster. The election is due on or before the date that is six months after the regular due date of your original return, without extensions. For a calendar-year individual, the publication gives the example that a 2025 disaster loss can be elected on the 2024 return through October 15, 2026. The reason people do this is cash: an amended prior-year return can produce a refund sooner than waiting for next spring.

When the car is used for business

A car used in a business is treated differently. Pub. 547 says losses on business property and income-producing property are not subject to the personal-use rules, which means the $100 and 10% reductions do not apply to them, and the limitation to federally declared disasters (or, from 2026, state-declared ones) does not apply either. A business vehicle damaged in an ordinary collision can produce a deductible loss, reported on Form 4684, Section B.

The measurement also changes. If business or income-producing property is stolen or completely destroyed, the publication says the decrease in fair market value is not considered, and the loss is your adjusted basis, minus any salvage value, minus any insurance or other reimbursement you receive or expect to receive. For a business car, adjusted basis is its cost reduced by the depreciation you have already deducted, so a fully depreciated work truck that is totaled may produce little or no loss even though it had real market value. The Form 4684 instructions add that business gains and losses flow to Schedule D, Form 4797 or Schedule 1 depending on the holding period and depreciation recapture.

Most cars are used both ways. Pub. 547 says that when property is used partly for business and partly for personal purposes, the $100 and 10% rules apply only to the personal-use portion. Allocating the loss between the two uses, keeping mileage records, and deciding what is depreciation recapture are matters for a tax professional. A vehicle you drive as an employee for an employer is a separate question, because the employee's own deductions are limited in other ways; ask the preparer rather than assuming it falls under the business rules.

If a business owner has commercial auto insurance or a business use endorsement, the insurance payment reduces the loss in the same way as for a personal car.

State income tax can differ

State rules are separate from federal rules, and some states do not follow the federal limitation. California is a documented example. The Franchise Tax Board's 2025 Schedule CA (540) instructions say that under federal law the personal casualty and theft loss deduction is suspended, with an exception for personal casualty gains, and that California law does not conform: California allows personal casualty and theft loss and disaster loss deductions, and the filer completes a second federal Form 4684 using California amounts. For tax year 2025, then, a California resident could have a state deduction for a loss the federal return disallows.

New York is another example of divergence by method. The state's itemized deduction guidance says New York itemized deductions are generally computed using the federal rules as they existed before the changes made for tax years after 2017. It does not address casualty losses on that page, and it directs readers to the IT-196 instructions for specifics.

Neither state's treatment says anything about yours. Check your own state revenue department's current instructions, particularly for 2026 returns, because federal law changed in 2026 and states update their conformity on their own schedules.

What to ask a tax preparer

• Was my event covered by a federal or state disaster declaration, and what was the declaration date? (FEMA and the state both publish them.)
• Did my insurer pay, and is any claim still open or any recovery from another driver still possible?
• What is my adjusted basis in the car, and what valuation source will we use for the before and after values?
• Is the car partly used for business, and if so how do we allocate the loss?
• Does my state follow the federal rule? If not, which form do I use?
• Would amending last year's return under the disaster election produce a refund, and what is my deadline?

Common questions

Can I deduct my insurance deductible if I was in an accident?

Not for an ordinary accident. A personal-use car loss is deductible only if a federally declared disaster (and, starting in 2026, a state-declared one) caused it, and even then the $100 and 10% of AGI reductions usually eliminate a loss as small as a deductible. A business car is the main exception to the disaster rule.

Does it matter whether I filed an insurance claim?

Yes. Pub. 547 says that if your property is insured you should file a timely claim, and if you do not, you cannot deduct the full unrecovered amount. Only the part your policy would not pay is deductible. A skipped claim never increases the tax deduction.

Is the insurance payment taxable?

Generally the payment is not income to the extent it reimburses a loss. Pub. 547's flood example says a reimbursement of repair costs is not income when received. If the payment is more than your basis in the property, the Form 4684 instructions have a line for the gain, and a reimbursement larger than you expected after you have already taken a deduction can also be reportable, so a preparer should look at any large payout.

My car was totaled in a flood. What should I keep?

Keep the insurer's total loss valuation and payment letter, the purchase documents showing your basis, and records of the disaster declaration and the date of the event. The related article on flood-damaged cars: total loss decisions and flood title brands covers the insurance side.

Does a state-declared disaster qualify for the $500 floor?

No. The IRS FAQ says losses from state-declared disasters cannot be qualified disaster losses, because only the President can declare those, so the $100 and 10% rules apply to them.

Key takeaways

• For a personal car, damage is deductible only if it arose from a federally declared disaster, or, starting in 2026, a state-declared one; ordinary collisions and thefts are not.
• Even a qualifying loss is reduced by $100 per event and by 10% of AGI, so a typical deductible produces no tax benefit.
• If the car is insured, you must claim what the policy covers; only the uninsured part, including the deductible, can be deducted.
• Business vehicles are exempt from the disaster limit and the $100 and 10% reductions but use adjusted basis, salvage and depreciation recapture, so ask a tax professional.
• State income tax rules differ, and California and New York are examples of states that do not simply copy the federal limit; check your own state for 2026.