Use this Form 8879 (Rev. January 2021) to authorize e-file of your Form 1040, 1040-SR, 1040-NR, 1040-SS, or 1040-X, for tax years beginning with 2019. Purpose of Form Form 8879 is the declaration document and signature authorization for an e-filed return filed by an electronic return originator (ERO). Complete Form 8879 when the Practitioner