Transmit Supporting Documents Accompanying a Return
You can attach supporting documents to income tax returns when electronically transmitting returns, to help tax authorities process them.
To attach supporting documents to a T2 or a CO-17 return, proceed in the manner indicated in the topic Attach a file, then select the supporting documents to transmit among the files attached to the return. Supporting documents can also be selected when preparing the return.
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To be able to transmit supporting documents accompanying a T2 return, the T2 return must have been transmitted less than 24 hours ago and must have been accepted.
You can transmit supporting documents separately from the T2 return, provided you comply with the 24-hour period. If this time period is past, the transmission of supporting documents will not be performed.
Supporting documents with the "Eligible" status are displayed by default in the list of attached documents to transmit in the transmission dialog box. The preparer can transmit them without having to select them. If the status of an attached file is "Accepted" or "Rejected" the file will not be listed in the list of files to transmit in the transmission box. The complete list of attached files is presented in the Properties dialog box, under the Attached files tab. The attached documents with a status of "Not Eligible" cannot be transmitted. For more information on the EFILE status of the T2 supporting documents, consult the topic EFILE status of a T2 supporting document.
Note that you cannot electronically transmit the supporting documents using a Web Access Code (WAC) with Corporate Taxprep; an EFILE number must be used to transmit such documents.
Note: The transmission of a supporting document will be available for initial returns and amended returns. However, for amended returns, send the entire T2 return, but only re-send attachments if the attachment information has changed.