You will enter this in TurboTax with the date acquired as the date of death, and the cost basis as the Fair Market value at Date of Death.
You will also show in TurboTax that this was inherited, so I would suggest just manually entering all of this, and keep the 1099B with the tax records.
IRS should be fine with this, however, if they do check this then you would have to provide proof of death and that it was inherited, and then the audit would result in no tax change.
To enter your Investments sold
Click on Federal Taxes
Click on Wages and Income
Click on I'll choose what I work on
Scroll down to Investments
On Stocks, Bonds, Other, click the start or update button
