(1) Bonds for any purpose may not be issued for a longer term than 20 years. (2) For purposes of this section, the term of a bond issue commences on July 1 of the fiscal year in which the city first levies taxes to pay principal and interest on the bonds.
Term Of General Obligation Bonds
Mont. Code Ann. § 7-7-4205, under Municipal General Obligation Bonds.
Mont. Code Ann. § 7-7-4205