You can deduct part or all of losses caused by theft, vandalism, fire, or similar causes, as well as corrosive drywall, but the process isn’t always obvious or simple:

• Only deduct losses that are greater than 10% of your adjusted gross income (line 38 of Form 1040).

• Fill out Form 4684, which involves complex calculations for the cost basis and fair market value.  This form gives you the number you need for line 20. 

Bottom line on line 20: If you’ve got extensive losses, it’s best to consult a tax pro. “I wouldn’t do it myself, and I’ve been dealing with taxes for 40 years,” says former IRS official Marti.

This article provides general information about tax laws and consequences, but shouldn’t be relied upon as tax or legal advice applicable to particular transactions or circumstances. Consult a tax professional for such advice; tax laws may vary by jurisdiction.