Deductions & credits

Thank you for responding so quickly. In my case, the tentative minimum tax is less than the regular tax by a larger value than the credit I was expecting I was able to see both the regular tax and the tentative minimum tax by going through the AMT calculation. Could there be another reason for the 0 value?
I have not found where the actual forms are as filled out by TurboTax. I'm using the on-line version. Maybe I need to pay before I see the forms? I'm a bit reluctant to pay if the tax calculation is incorrect.