If you are trying to make an adjustment to the gain or loss of a transaction (or the cost basis) reported on your 1099-B and you are using the online version of TurboTax Premier, you can enter this information by following the steps below:
- In the Wages and Income section, click Edit/Add next to Stocks, Mutual Funds, Bonds, Other and then Edit next to the Company name.
- Click Continue and the click the "pencil" icon next to the transaction
- Select the box next to "The cost basis is incorrect or missing on my 1099-B"
- Continue until you get to the section "We noticed there's an issue with your cost basis...Let us know if you'd like to make any changes" and answer the questions. TurboTax will enter the correct adjustment code based on your answers to the questions.
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