If the loss occurred in 2017 and it’s a personal loss, it may be deductible as a theft loss. The loss is treated as an itemized deduction allowable only to the extent it exceeds 10% of adjusted gross income. Starting in 2018, there is no deduction allowed for personal theft losses. Of course, business losses continue to be deductible.
The amount of gain reportable and subject to tax. On certain tax-free exchanges of property, gain is not recognized in the year it is realized.