Yes, you need to fill in the empty fields either with zeroes, or the information from your records. This is true even when the fields are blank on your 1099-B.
You should go back and review the 1099-B section in TurboTax:
- Select Federal, then Wages & Income.
- Scroll down and look for Investments & Savings.
- Expand the section and find Stocks, Mutual Funds, Bonds, Other and click on Start or Update to the right.
- Click the down arrow to the right of your 1099-B and then click on Edit.
- On the screen Review your (name) sales, look for the incomplete transactions and click Edit, or the pencil icon, to the right.
- Fill in any missing information.
- If your blank field is a date, check your records for the correct date, or enter Various.
- If your blank field is the cost basis, check your records for the actual cost basis. You can enter 0 for cost basis, but that will make the entire proceeds amount taxable.
- Repeat with each transaction that is flagged Needs Review.
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