This is a TurboTax bug, and is simple to replicate. Go to Schedule A, line 5a, and then click on "goto supporting form". This takes me to the Tax and Interest Deduction Worksheet" but highlight...
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This is a TurboTax bug, and is simple to replicate. Go to Schedule A, line 5a, and then click on "goto supporting form". This takes me to the Tax and Interest Deduction Worksheet" but highlights line 1a(1). Looking further on the "Tax and Interest Deduction Worksheet" line 1i is '0.00', since lines 1b through 1h are all blank. Line 1i is then supposed to populate Schedule A, line 5a. But it doesn't. Schedule A, line 5a is blank, when it should be zero! This causes Schedule A, line 7 to also be blank. This then causes AMT form 6251, line 2a to use my standard deduction value when it should be getting the value from Schedule A, line 7. I then override a blank field with '0', on Schedule A, line 5a. This is not the source of any problem. Changing a blank deduction field to zero shouldn't change anything. Yet it fixes the issue with the wrong value being used in the AMT form 6251, line 2a. It now contains '0.00' instead of my standard deduction amount.