After you file

But since the 1040X column A must start with the return as corrected by the IRS  if you just start the amendment process before you correct column A then the bottom line will not be correct.  This could give the user the impression that they are going to get a bigger refund then they are entitled to  and  it is unknown at this time if the  IRS  will mail it back for the user to correct   or make the needed changes themselves.