Mont. Code Ann. § 33-2-110

33-2-110 . Special surplus required. In addition to the minimum paid-in capital stock (stock insurers) or minimum surplus (mutual and reciprocal insurers) required by 33-2-109 , special surplus shall be possessed by insurers as follows:

(1) All stock insurers and mutual and foreign reciprocal insurers which have actively transacted insurance in their state of domicile as an authorized insurer for less than 5 years or, if an alien insurer, have transacted insurance as an authorized insurer in at least one state of the United States for less than 5 years when first authorized to transact insurance in this state shall have a surplus or additional surplus equal to not less than 100% of the paid-in capital stock (if a stock insurer) or surplus (if a mutual or foreign reciprocal) otherwise required under 33-2-109 for the kinds of insurance to be transacted.

(2) Insurers that have actively transacted insurance as authorized insurers in one or more states of the United States for more than 5 years shall possess, when first authorized in this state, surplus or additional surplus equal to not less than 50% of the paid-in capital stock (if a stock insurer) or surplus (if a mutual or foreign reciprocal insurer) otherwise required under 33-2-109 .

(3) Insurers authorized to transact multiple lines of insurance in this state shall at all times have and maintain surplus of not less than $100,000, in addition to the capital (if a stock insurer) or surplus (if a mutual or foreign reciprocal insurer) required by 33-2-109 . The amount of such surplus shall be included within the surplus required of newly authorized insurers pursuant to subsections (1) and (2) of this section.