If you filed them both electronically, this does not apply to you. If you mailed your Michigan return, there would be an actual signature on the return.
Form MI-8453 is the declaration and signature document for a State Stand-Alone (unlinked) return. If you e-file your federal and Michigan returns, Michigan will accept the federal signature (PIN). If you e-file a State Stand-Alone return the Electronic Signature Alternative (ESA) or paper Form MI-8453 must be used to sign your return.
