They have publications: https://www.irs.gov/e-file-providers/modernized-e-file-mef-user-guides-and-publications https://www.irs.gov/e-file-providers/modernized

They have publications: https://www.irs.gov/e-file-providers/modernized-e-file-mef-user-guides-and-publications https://www.irs.gov/e-file-providers/modernized-e-file-mef-u...