ARM 42.23.211. USE OF SEPARATE ACCOUNTING METHOD

(1) In applying the separate accounting method, each item of income is segregated and directly allocated according to its source. Any expense or other deductible items, including a reasonable allowance for general overhead expenses, attributable to the earning of such income are likewise segregated and deducted from such income. Items of nonapportionable income are to be allocated as provided for under 15-31-304, MCA.