Storm and flood damage: casualty losses after a federal disaster declaration

Storm damage to a home is deductible only when it comes from a federally declared disaster. Even then the deduction is smaller than most people expect, because insurance, a per-event floor and a share of your income all come off first.

The gate: a federally declared disaster

Start here, because most storm damage does not get through. Damage to property you hold for your own use reaches a return only where a federally declared disaster caused it, and only where your state was one of those the declaration covered.

An ordinary bad storm that flooded a street and was never declared produces no deduction, whatever the repairs cost. FEMA publishes the declarations, each with the counties covered and its incident period, and that record is where you check your own address and dates first.

The two kinds of loss

There are two routes, and they are not close in value. A federal casualty loss is the ordinary rule: it applies to any federally declared disaster, each loss is reduced by $100, the total is then reduced by 10% of your adjusted gross income, and you have to itemize on Schedule A to claim anything.

A qualified disaster loss belongs to a defined set of declarations and is treated much better. Each loss is reduced by $500 instead, the reduction for a share of income does not apply at all, and you can claim it without itemizing your other deductions.

Which one is yours: the three-date test

For the most recent category of qualified disaster loss, three conditions all have to hold at once. The disaster must have been declared by the President inside the declaration window; its incident period must have begun inside the incident window; and that incident period must have ended by the closing date.

A disaster declared only by reason of COVID-19 is excluded from the definition. If any of the three conditions fails, the ordinary federal casualty loss rule generally applies instead. The declaration number, the counties and the incident period dates are all on the FEMA declaration for your own county, so this is a test you can settle yourself rather than guess at.

The older categories, in one paragraph

The word "generally" above is doing real work. Publication 547 also lists several named earlier categories that are qualified disaster losses without meeting the three-date test, and Hurricane Harvey and Tropical Storm Harvey are both on that list, which matters for older Houston claims. If your loss is from an earlier year, read the definition in Publication 547 rather than applying the window.

How the number is built

Work through it in order, once. The loss starts as the smaller of two numbers: your adjusted basis in the property, which is usually what you paid plus improvements, or the drop in its fair market value caused by the event.

From that, subtract any insurance or other reimbursement you received or reasonably expect to receive. Then subtract the per-event floor for the kind of loss you have. Then, if you are on the ordinary route, subtract the share of your adjusted gross income above. What survives is the deduction, and for a well-insured house there is often nothing left.

Insurance and FEMA money

Two separate points live here, and they are easy to run together.

The first is that the money is generally not income. Where a declared disaster left you with expenses and a qualified disaster relief payment covered them, that payment is not taxed to you, and a Stafford Act disaster relief grant is generally kept out of income as well. One payment under the same Act breaks the pattern, and it is the one readers trip over: unemployment assistance is taxable, and it lands on the return as unemployment compensation.

The second is that the money still reduces the deduction, but only where it specifically reimburses the loss. Housing, medical, transportation, personal property and funeral needs are what these grants are paid to meet, and the grant itself is untaxed; what you give up is the deduction for whichever losses or medical costs it specifically covered. Receiving assistance does not by itself shrink an unrelated loss.

One more turn: a settlement above your adjusted basis produces a gain, not a loss, which surprises owners of older homes and cars. Replacement rules can postpone it, and they are worth a preparer.

The election to claim it a year early

By default the loss belongs to the disaster year. Where the disaster struck an area warranting public assistance, individual assistance or both, an election lets you take it a year earlier instead: it goes onto the return for the year before the disaster year, original or amended, and the loss is then dated to that earlier year for tax purposes.

So a 2025 Houston loss goes on the 2024 return. If that return has not gone in yet, it goes on the original. If it has, it goes on an amended one, which for an individual is Form 1040-X. The election has to be made within six months after the regular due date, without extensions, of the original return for the disaster year, so a calendar-year taxpayer with a 2025 loss has until October 15, 2026 to amend the 2024 return.

The reason to bother is timing. The earlier year may produce a refund now instead of next spring, and it may be a year in which your income made the deduction worth more. Form 1040-X covers how the amendment itself works.

Records to keep, starting today

Photograph everything before repairs begin, and keep the adjuster's report, every repair receipt, the purchase records that establish your basis, and the FEMA paperwork. Reconstructed numbers are what fail here.

The deduction itself is figured on Form 4684 and carried to Schedule A when you are itemizing, so whether you itemize at all matters to the ordinary route. Standard deduction or itemizing is the check to run first.