A financial institution that is part of a unitary business (i.e. the group files franchise and excise taxes with Form FAE174) will not need to submit form FAE 186 unless it is the financial institution that files form FAE174. It is not necessary for non-depository financial institutions that are part of the unitary business and that do not file form FAE174 to individually submit form FAE186.
Reference: Tenn. Code Ann. § 67-4-2017.