Calculating the Casualty Deduction

For losses of trade or business property, or property used to produce rentals or royalties, once you've calculated the amount of your loss and subtracted the amount of your reimbursement, the remainder is your deductible loss (or gain).

For losses of income-producing property that is not described above (for example, investments such as stocks, bonds, gold, silver, and works of art), your casualty losses are added to your itemized miscellaneous deductions. All of these deductions are added together, 2 percent of your adjusted gross income is subtracted, and the remainder is your deductible amount.

Limits on personal losses. For thefts or casualties of personal or family property, your deductible loss is much more strictly limited. After calculating the amount of your loss and subtracting any reimbursements, you must subtract $100 for each casualty, theft, or accident you suffered during the year, regardless of the number of items that were damaged or destroyed during the event.

If you are married filing jointly, a single $100 reduction applies for each event, but if you are filing separately, each spouse who claims a loss must subtract $100, for a total of $200 per event for jointly owned property. If only one spouse owned the property at issue and you are filing separately, that spouse is the only one who can claim a deduction (and must apply the $100 reduction).

After the first $100 is subtracted, you're not in the clear yet. You must again reduce your deductible loss by a full 10 percent of your adjusted gross income as shown on Line 37 of your Form 1040. As a result, small personal casualty losses are unlikely to bring you any tax benefits.

Save Money Generally, nonbusiness casualty losses are deductible for itemizing taxpayers only to the extent they exceed 10 percent of the taxpayer's adjusted gross income (AGI) and a $100 floor. As a result of the Gulf Opportunity Zone Act of 2005, however, casualty losses meeting the following requirements are not subject to these restrictions: those arising in the Hurricane Katrina disaster area on or after August 25, 2005, and which are attributable to Hurricane Katrina (the Hurricane Katrina disaster area is that area declared to be a major disaster area by the President before September 14, 2005, by reason of Hurricane Katrina); those arising in the Hurricane Rita disaster area on or after September 23, 2005, and which are attributable to Hurricane Rita (the Hurricane Rita disaster area is that area declared to be a major disaster area by the President before October 6, 2005, by reason of Hurricane Rita); or those arising in the Hurricane Wilma disaster area on or after October 23, 2005, and which are attributable to Hurricane Wilma (the Hurricane Wilma disaster area is that area declared to be a major disaster area by the President before November 14, 2005, by reason of Hurricane Wilma). Hurricane casualty losses are segregated as a separate deduction from all other casualty losses and are disregarded when computing other casualty losses incurred by the taxpayer. However, casualty losses resulting from factors other than Hurricanes Katrina, Rita or Wilma are still subject to the general casualty loss restrictions -- the 10 percent threshold and the $100 floor. Affected taxpayers can choose either to claim the casualty loss in 2005 or amend their tax returns from 2004 to deduct the loss. If a taxpayer opts to claim the casualty loss on an amended 2004 tax return, the taxpayer may benefit from a quicker use of cash from a refund claim.

Mixed-use property. If you suffered damage to your home, part of which you were using as a home office, or to your car, which you sometimes used for business, you have mixed-use property and your loss must be proportionately divided between the two types of usage. You will actually treat the event as if it were two separate losses. The $100 and 10 percent of AGI reduction applies only to the personal portion of the loss. Some special considerations apply in the case of home offices.