An application for a deduction from the current year’s value must be filed by Dec. 31 for property that is destroyed or damaged in the first nine months of the year. For property damaged in the last three months of the year, the filing deadline is Jan. 31 of the following year. This form should be filed with the county auditor of the county in which the property is located. Any deduction from value approved will affect the tax bills due the following year. The amount of the deduction equals a percentage of the reduction in value caused by the damage or destruction. That percentage is determined by the calendar quarter in which the damage occurred.  See the back of the destruction form for the filing deadline and percentage deduction allowed for each calendar quarter.