72 Pa. Stat. § 2241
From and after the passage of this act every incorporated company or limited partnership whatever, whether the same be incorporated, formed or organized under the laws of this or any other state or territory, and doing business within this Commonwealth, and liable to taxation therein, which is not subject to the taxes imposed by the twenty-first or twenty-fourth sections of this act, except incorporated banks and savings institutions having capital stock, and foreign insurance companies, shall annually, upon the fifteenth day of March of each year, make report to the Department of Revenue setting forth the entire amount of net earnings or income received by said company or limited partnership from all sources during the preceding year, and such other information as the department may require; and upon such net earnings or income, the said company, association or limited partnership, as the case may be, shall pay into the State Treasury, through the Department of Revenue, for the use of the Commonwealth, within the time prescribed by law for the payment of State taxes settled by the Department of Revenue, three per centum upon such annual net earnings or income, in addition to any taxes on personal property to which it may be subject under the first section of this act. The penalty for failure to make such report shall be as provided by law: Provided, That this section shall not apply to corporations and limited partnerships chartered or organized for manufacturing purposes, nor to cooperative agricultural associations organized under the laws of this or any other state.
There shall be no liability for tax under the provisions of this act from any cooperative agricultural association doing business in the Commonwealth of Pennsylvania prior to the passage of this amendment.
72 P.S. § 2241