1040-US ELF: Documents attached as PDF files under MeF Program (FAQ)

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MFA required for electronic filing

Effective May 3rd, the 2017 version of UltraTax CS requires multi-factor authentication (MFA) to transmit e-files from CS Connect. Find out more.


What documents can I attach as PDF files under the 1040 Modernized e-File (MeF) Program?


Refer to IRS Publication 4164 for information about binary attachments for electronic files.

Refer to Tax Year 2017 Recommended Names for PDF Files Attached to 1040 MeF Submissions for IRS recommendations for naming PDF files of supporting documents.

Related topic: 1040-US ELF: Electronic filing FAQs

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