I believe you mean that you purchased stock and the stock became worthless in 2020. If so, you would report this as a sale of an investment in TurboTax as follows:
- Income and expenses
- Investment income
- Stocks, Mutual Funds, Bonds, Other
- Indicate the you didn't receive a 1099-B form
- Choose the I'll enter one sale at a time option
- Enter a description, date acquired, date sold, sale proceeds as $0 and the cost basis as the amount you paid for the stock
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