Under current law, only damage attributable to a Federally declared disaster is deductible as a casualty loss (except for business property).
If the damage was to areas that are part of your house, such as the roof and lanai, you can enter "house". For damage to personal property not attached to the house, list those items separately.
Your cost basis is generally what you paid for the house, plus the cost of any improvements to the house; for example, if the damaged roof had been replaced before the casualty.
The insurance reimbursement is the actual amount paid. The deductible is part of what wasn't paid by insurance. You must have applied for any available insurance reimbursement.
The fair market value before the loss is what the house or the item would have sold for on the open market immediately before the casualty. The fair market value after the casualty is what the house or item would have sold for on the open market after the casualty. If an item was completely destroyed or lost, the FMV after the casualty is zero.
For more information, please see IRS Publication 547 and this TurboTax help article.
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