From https://www.irs.gov/taxtopics/tc453.html this is what you need to have to be able to take a non-business bad debt (fully worthless, able to show the debt was real, e.g. a promissory note, and steps taken to get paid, e.g. lawsuit, demand letters, etc.
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Nonbusiness bad debts must be totally worthless to be deductible. You can't deduct a partially worthless nonbusiness bad debt.
A debt becomes worthless when the surrounding facts and circumstances indicate there's no reasonable expectation of payment. To show that a debt is worthless, you must establish that you've taken reasonable steps to collect the debt. It's not necessary to go to court if you can show that a judgment from the court would be uncollectible. You may take the deduction only in the year the debt becomes worthless. You don't have to wait until a debt is due to determine that it's worthless.
Report a nonbusiness bad debt as a short-term capital loss on Form 8949 (PDF), Sales and Other Dispositions of Capital Assets, Part 1, line 1. Enter the name of the debtor and "bad debt statement attached" in column (a). Enter your basis in the bad debt in column (e) and enter zero in column (d). Use a separate line for each bad debt. It's subject to the capital loss limitations. A nonbusiness bad debt deduction requires a separate detailed statement attached to your return.
(emphasis added)
This previous answer describes how to enter a non-business bad debt in TT
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