No. Treasury is not issuing Customer Service Numbers (CSN) for MBT e-file.
The CSN issued for Single Business Tax e-file cannot be used for MBT e-file
return submissions.
The signature process for MBT e-file returns is as follows:
Fed/State (Linked) Returns:
Michigan will accept the federal signature (scanned Form 8453 or the
Practitioner PIN option). As long as there is an IRS submission ID that links
the two returns together, it is considered a Fed/State filing. Michigan does not
require any additional signature documentation.
State Stand Alone (Unlinked) Returns:
State Stand Alone returns must be signed using the Michigan Business Tax e-file
Authorization, Form 4665 (MI-8453-MBT). The completed MI-8453-MBT must be
included as a scanned attachment when transmitting the MBT return
electronically.
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