Ok figured this out - flag for TurboTax to fix. Form 8911 REQUIRES you to fill in your TENTATIVE MINIMUM TAX (Line 17). Even if you did not fill qualify for AMT you are still required to fill (and file) FORM 6251 for AMT (this is stated in the instructions for form 8911). Unfortunately, TurboTax has not realized this requirement and since you cannot force it to submit form 6251 it has nothing to enter here and ends up messing up Form 8911. This is 100% TurboTax's issue and it needs to be corrected.
