There is nothing to mail if you e-file your tax return.
See this - https://ttlc.intuit.com/community/print-and-file/help/do-i-need-to-mail-anything-after-i-ve-e-filed/...
No. When you efile there is nothing to mail. Except maybe a check if you have a tax due. That's one of the big benefits to efile.
