55 Pa. Stat. § 582
The effectuation of the authorized purposes of any authority created under this act, shall and will be in all respects for the benefit of the people of the Commonwealth, for the increase of their commerce and prosperity, and for the improvement of their health and living conditions; and since the authority will be performing essential government functions in effectuating such purposes, the authority shall not be required to pay any taxes or assessments upon any property acquired or used by it for such purposes, or fee, bridge tolls or other charge imposed or authorized to be imposed by virtue of any law of the Commonwealth of Pennsylvania, except vehicle registration fees, liquid fuels taxes, fuel use taxes, gross receipts taxes imposed as an excise on the use of public highways, and tolls imposed by the Pennsylvania Turnpike Commission. In lieu of taxes or special assessments, the authority may agree to make payments to any municipality. The bonds issued by the authority, their transfer and the income therefrom, including any profits made on the sale therefrom, shall at all times be free from taxation, other than inheritance and estate taxation, within the Commonwealth of Pennsylvania.
55 P.S. § 582