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If someone owes you money that you cannot collect, you may have a bad debt. For a discussion of what constitutes a valid debt, refer to Publication 550, Investment Income and Expenses, and Publication 535, Business Expense. To deduct a bad debt, you must have previously included the amount in your income or loaned out your cash. If you are a cash basis taxpayer, you may not take a bad debt deduction for money you expected to receive but did not (for example, for money owed to you for services performed, or rent) because that amount was never included in your income. For a bad debt, you must show that there was an intention at the time of the transaction to make a loan and not a gift. If you lend money to a relative or friend with the understanding that it may not be repaid, it is considered a gift and not a loan.
http://www.irs.gov/taxtopics/tc453.html