For purposes of determining a utility's cost of service in rate-making proceedings, the income tax expense portion shall be calculated on the basis of net income before income taxes. Any difference between income based on the utility's accounting records and income determined in accordance with United States Internal Revenue Service laws and regulations will be accounted for as required by generally accepted accounting principles governing all businesses.
(Code 1933, § 93-307.4, enacted by Ga. L. 1981, p. 121, § 5.)