72 Pa. Stat. § 5568a
All penalties and interest imposed on delinquent county, city (except city of the first class), borough, town, township, school district (except school district of the first class), and poor district taxes, for the tax year one thousand nine hundred and thirty-four and all previous years, assessed against any real estate, shall be abated by the authority levying the tax, if said delinquent taxes are paid as hereinafter provided.
In order to receive the benefits of this act, twenty per centum of the delinquent taxes due for the tax year one thousand nine hundred and thirty-four and for all previous years shall be paid on, or before, the first day of November, one thousand nine hundred and thirty-five; twenty per centum on, or before, the first day of November, one thousand nine hundred and thirty-six; twenty per centum on, or before, the first day of November, one thousand nine hundred and thirty-seven; twenty per centum on, or before, the first day of November, one thousand nine hundred and thirty-eight; and the final twenty per centum on, or before, the first day of November, one thousand nine hundred and thirty-nine: And provided, That the respective current taxes for the years during such installment periods shall be paid before they become delinquent; and if such current taxes are not paid before they become delinquent, then any penalties and interest, abated on any installment of delinquent taxes theretofore paid, shall be added to the remaining installments of unpaid delinquent taxes: Provided further, That where any tax for the year one thousand nine hundred and thirty-five became delinquent prior to the effective date of the act to which this is an amendment, or becomes delinquent at any time within thirty days after the effective date of the act to which this is an amendment, such tax and any penalties due thereon shall be paid at any time on, or before, November first, one thousand nine hundred and thirty-five, in order to receive the benefits of this act.
If any taxpayer, availing himself of the provisions of this act, shall fail to pay any installment of taxes, as hereinbefore provided, for the tax year one thousand nine hundred and thirty-four and all previous years, as hereinbefore provided; then the penalties and interest due on such unpaid installment or installments shall not be abated.
Any taxpayer may anticipate the payment of such delinquent taxes for the tax year one thousand nine hundred and thirty-four and previous years at any time on, or before, November first, one thousand nine hundred and thirty-five, and receive the benefit of this act, and in such cases payment of current taxes shall not be required.
This act shall be construed to apply to all taxes whether, or not, liens for such taxes have been returned for nonpayment, or have been filed in the office of the prothonotary of the county, or proceedings for the collection of such taxes have been instituted in any court in said county, or where real property has been sold to a county, city, borough, town, township, school district, or poor district at a tax sale or on a tax lien, and the period of redemption has not expired; but this act shall not be construed to apply to cases where real property has been sold other than to a county, city, borough, town, township, school district, or poor district at a tax sale or on a tax lien, and where the period of redemption has not expired.
The benefits of this act shall extend to and accrue to any grantee, transferee, mortgagee, or other party in interest in the real estate against which the above mentioned taxes have been assessed and levied.
For the purposes of this act, a tax shall be deemed to become delinquent on the date when a penalty attaches to the tax.
72 P.S. § 5568a