The allowable deduction for business property destroyed in a casualty is usually different from the loss of personal property. If the property is used in a trade or business or other activity conducted for profit, the allowable deduction is the lesser of the property’s adjusted basis (before the casualty) or its decline in value because of the casualty. If business property is completely destroyed, the deduction is the full amount of the property’s adjusted basis, reduced by any insurance recovery, even if the basis exceeded the property’s value before the casualty. If you have disaster-related losses to business assets, you don’t have to worry about the $100 subtraction rule or the 10% of AGI subtraction rule. Instead, you can deduct the full amount of your uninsured loss as a business expense
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