The form is now calculating correctly. You need to keep $7500 listed regardless of purchase date and TurboTax then calculates your ACTUAL credit based on delivery date. I took delivery of my Model 3 at end of November ($1875).
I entered $7500 in the box on the software, the federal credit went up by $1875. Then if you check the PDF of what they are actually filing it also shows $1875.
I just refiled today so we'll see if it goes through. Assuming it does Turbotax MUST update the form to better explain to folks how this works as it is very misleading and many of us have spent too much time trying to figure it out.
