Get your taxes done using TurboTax

This exact issue still exists in TurboTax 2018. Seems like the only workaround is to break the exercise transactions into multiple smaller amounts. Which means they won't match the Form 3921 the company submitted to the IRS. Hopefully this mismatch doesn't trigger an audit/review (even though the math gives the same result).

The error mentioned by slauer is still there too. You can enter the transaction even though the share # filed is blank. If you don't catch this manually it'll result in a potentially very expensive follow-up from the IRS