In the past, when a return was amended and mailed in, it was necessary to indicate in the explanation which schedules and/or forms were effected by the amendment and a copy of these corrected forms was attached to 1040-X. When e-filing the amendment, is it necessary to now attach these corrected forms as a pdf?
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All necessary forms should automatically be included, you shouldnt need to attach anything additional.
... unless the diagnostics instruct otherwise.