Limitation on personal casualty and theft losses. Personal casualty and theft losses of an individual, sustained in a tax year beginning after 2017, are deductible only to the extent that the losses are attributable to a federally declared disaster. Personal casualty and theft losses attributable to a federally declared disaster are subject to the $100 per casualty and 10% of your adjusted gross income (AGI) reductions unless they are attributable to a qualified disaster loss. Personal casualty and theft losses attributable to a qualified disaster loss are not subject to the 10% of the AGI reduction and the $100 reduction is increased to $500. An exception to the rule above, limiting the personal casualty and theft loss deduction to losses attributable to a federally declared disaster, applies if you have personal casualty gains for the tax year.