On a 1040-X, where does the information on line 16 come from? ("Total amount paid with request for extension of time to file,...")

[Bsch4477]

Line 16—Amount Paid With Extension
or Tax Return
On this line enter the total of the following amounts.
• Any amount paid with your request for an extension on Form 4868, Application for Automatic Extension of Time To File U.S.
Individual Income Tax Return, or Form 2350, Application for Extension of Time To File U.S. Income Tax Return (use the following chart to find the corresponding line). Also include any amount paid electronically in connection with an extension of time to file, but don’t include the convenience fee you were charged.
If you take the additional child tax credit even though you ! aren’t eligible and it’s determined that your error is due
• The amount you paid with your original return, regardless of method. Also include any additional payments you made after it was filed. However, don’t include payments of interest or penalties, or the convenience fee you were charged.

[fanfare]

That has to come from your own records. That's your credit for everything you've sent for that year so far.

[Anonymous]

when you did the original return did you enter the extension payment when you got to that question.  if so that's where it came from on the amended return.   of course if you made an improper entry at that time TT is not going to know it's wrong so that would be an adjustment on the amended return.