Hey Nathan,
I manually filled out the 8911 form and TurboTax is calculating correctly. I am not paying AMT and have the same circumstance where the EV Vehicle Credit and Child Credits are putting me well below the AMT Tentative Tax.
You can certainly fill out the 8911 manually; It my case Line 18 Calculates to -$390 which means I do not qualify or need to find a way to reduce my Tentative Minimum Tax. You can read the Instructions for Line 17/18 Here: https://www.irs.gov/pub/irs-pdf/i8911.pdf
