these are from the instruction so sometimes the form must be filed even if the AMT tax is zero. see if any apply.
I wouldn't worry even if not required.
Who Must File
Attach Form 6251 to your return if any of the following
statements are true.
1. Form 6251, line 7, is greater than line 10.
2. You claim any general business credit, and either line 6
(in Part I) of Form 3800 or line 25 of Form 3800 is more than
zero.
3. You claim the qualified electric vehicle credit (Form
8834), the personal-use part of the alternative fuel vehicle
refueling property credit (Form 8911), or the credit for prior
year minimum tax (Form 8801).
4. The total of Form 6251, lines 2c through 3, is negative
and line 7 would be greater than line 10 if you didn’t take into
account lines 2c through 3
