How much of the return do I send for amendment?
I was notified by TurboTax that the government post-actively extended the tax credit for vehicle charging stations into 2018, and that I should amend my return. I re-opened my 2018 taxes in TT and went through the process for an amendment, and it generated a 1040-X along with 40 pages of documentation.
In the process it seems to have found other credits and deductions that weren't captured in my original filing, in addition to the specific credit I was looking for (e.g., the net change to credits on line 7 is $492, which exceeds the max credit allowable for the charging station, and there is a net increase in the amount of deductions).
I'm not unhappy about this, but I'm wondering how much of the return I need to send. Should I just send the entire 40 page thing? How do I fill out the explanation of changes in Part III if I don't specifically know what other things have changed? Many of the lines in column B are now non-zero...