53 Pa. C.S. § 8223
The treasurer of each local government unit shall deposit into the applicable sinking fund or other fund the moneys to be deposited therein pursuant to the pledge or covenant made or adopted by the local government unit at the times and in the amounts provided in the pledge or covenant or, if no pledge or covenant has been made or adopted, as provided in the appropriations made by the governing body. If no appropriation of moneys has been made or if it appears that, as a result of other expenditures, the appropriated revenues will not be received in sufficient amounts in time to make either the deposits required to be made for the payment of the taxes assumed and the interest on and principal of general obligation bonds and notes or the amount due on a guaranty of guaranteed revenue bonds or notes or on a guaranty of any authority or other local government unit obligation, the treasurer shall pay into the applicable sinking fund or other fund that portion of each receipt of tax moneys and other available revenues, subject, in the case of a limited guaranty, to the terms thereof, as will result in the deposit of sufficient moneys in the sinking fund or other fund to pay the taxes assumed and the principal of the interest on the bonds or notes or to meet the guaranty obligation of the local government unit as and when they become due and payable. The governing body of a local government unit may issue its tax anticipation notes under Subchapter B of Chapter 81 (relating to tax anticipation notes and funding debt) to provide all or any part of any moneys needed for deposit in the sinking funds or other funds.
53 Pa.C.S. § 8223