If you made a nonbusiness loan to someone and the loan is completely worthless, you can take a nonbusiness bad debt deduction. A nonbusiness bad debt is treated as a short-term capital loss. A business bad debt is an ordinary loss. A loan to a friend or made for investment purposes is a nonbusiness bad debt, not a business bad debt.
If, however, you can show that your money was obtained by fraud or similar action that constitutes a crime under state law, you can treat it as a theft loss if you itemize deductions. Theft losses involving a personal transaction (not investment or business) are subject to two reductions: $100 per occurrence during the year and 10% of adjusted gross income for all casualty and theft losses in the year.
Forced disposition of property due to condemnation, theft, or casualty. Tax on gain from involuntary conversions may be deferred if replacement property is purchased.