A recent Tax Court case dealt with a familiar topic: Theft losses. I.R.C. section 165 has historically allowed taxpayers to deduct three types of losses: those incurred in a trade or business, those incurred in a transaction entered into for profit, or losses arising from other causes, such as theft. (Note, however, that due to certain changes pursuant to the Tax Cuts & Jobs Act of 2017, individuals may be prevented from taking certain theft losses.)