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@Ryan Liu wrote:

. I just followed your instructions to manually input the expected credit amount, it works.

I don't think this Form-8936 is not ready as of now since on the one hand no red error box popped out

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Yes, you need to manually input the tentative credit.  The program doesn't know what the vehicle qualifies for, so you need to enter that.

I agree, it should mark that box as a pink error once you start filling out the form.