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@JOHNNYCPA wrote:

What years can I amend electonically.?

Do I go to the proseries tax return software application year to amend? for example, to amend 2018 tax return, do I use 2018 or  2020 proseries program ?

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Youd use the 2018 program to amend a 2018 return, and no, you cannot Efile a 2018 amendment.