(1) The payroll factor of the apportionment formula for each trade or business of the taxpayer shall include the total amount paid by the taxpayer in the regular course of its trade or business for compensation during the tax period.

(2) The total amount "paid" to employees is determined upon the basis of the taxpayer's accounting method. If the taxpayer has adopted the accrual method of accounting, all compensation properly accrued shall be deemed to have been paid. Notwithstanding the taxpayer's method of accounting, at the election of the taxpayer, compensation paid to employees may be included in the payroll factor by use of the cash method if the taxpayer is required to report such compensation under such method for unemployment compensation purposes.

(3) The compensation of any employee on account of activities which are connected with the production of nonapportionable income shall be excluded from the factor.

(4) ARM 42.26.202 provides the definitions applicable to this rule.