Get your taxes done using TurboTax

you have to print preview your 1040-X Part III to be sure no text is truncated.

Even if e-Filing, I would not go out to 255 chars per line.

But, what do I know, 

If you  need more space enter "see more on attachment" and file on paper.

IRS says: for 1040-X,  paper and e-File have the same processing time 

 

AMendments are processed in the order received.

 

Refer to the Instructions for what is to be attached to Form 1040-X.

Do not include your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.

 

@bbxrider