40 Pa. Stat. § 444
Every stock or mutual insurance company, association, or exchange of another State or foreign government, authorized to do business in this Commonwealth, shall make report to the Department of Revenue, on or before March fifteenth of each year, under oath of its president, secretary, or attorney, showing the gross premiums of every character and description received from business transacted in the Commonwealth during the year, or fraction of year, ending with the thirty-first day of December preceding, whether said premiums were received in money or in the form of notes, credits, or any other substitute for money or whether the same were collected in this Commonwealth or elsewhere, and to pay into the State Treasury the requisite tax upon all such premiums. Such companies, associations, and exchanges, in making such report, may deduct, from the gross premiums received, all premiums returned on policies canceled or not taken, and all premiums actually received for reinsurances. Stock companies with participating features, in addition to the aforesaid deductions, may deduct that portion of the premiums returned to the policyholders. Life insurance companies may deduct dividends declared and actually used by policyholders in payment of renewal premiums; and mutual companies, associations, and exchanges may deduct that proportion of the advance premium or deposit returned to members upon the expiration or termination of their contracts. "Gross premiums" are defined to be the amount of dues, fees, and premiums stated in the policy contracts.
40 P.S. § 444