Generally, you may deduct losses to your home, household goods, and motor vehicles on your federal income tax return. However, you may not deduct a casualty or theft loss that is covered by insurance unless you filed a timely insurance claim for reimbursement. Any reimbursement you receive will reduce the loss. If you did not file an insurance claim, you may deduct only the part of the loss that was not covered by insurance.
Determine your cost or other basis in the property before the casualty or theft.
Determine the decrease in fair market value (FMV) of the property as a result of the casualty or theft. (The decrease in FMV is the difference between the property's value immediately before and immediately after the casualty or theft.)
From the smaller of the amounts you determined in (1) and (2), subtract any insurance or other reimbursement you received or expect to receive.