Proof of Loss To deduct a casualty or theft loss, you must be able to show thatthere was a casualty or theft. You also must be able to support theamount you take as a deduction. Casualty loss.For a casualty loss, you should be able to show all of thefollowing. The type of casualty (car accident, fire, storm, etc.) andwhen it occurred. Zimmer TartuThat the loss was a direct result of the casualty. That you were the owner of the property, or if you leasedthe property from someone else, that you were contractually liable tothe owner for the damage. Theft loss.ERROR MSGFor a theft loss, you should be able to show all of the following. When you discovered that your property was missing. hotels in YorkThat your property was stolen. That you were the owner of the property. Files: Gdyna hotel roomsIt is important that you have records that will prove yourdeduction. If you do not have the actual records to support yourdeduction, you can use other satisfactory evidence that is sufficientto establish your deduction.