No, this isn't a TurboTax bug.
Yes, you have to manually enter your cost basis if the imported box 1e is blank.
Since the gain on that stock sale was included as income on your W-2 Box 1 Compensation, to avoid double taxation:
- You will need to change the stock basis on the date of the sale, to the price on the date of sale.
- The result is zero gain or a minor loss due to brokers commission/fees.
- The IRS will expect to see that information on your tax return.
For additional information, see the TurboTax article: Non-Qualified Stock Options.
Additional information: Where do I enter or import a 1099-B?
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