72 Pa. Stat. § 5571j
Any taxpayer may on, or before, December thirty-first, one thousand nine hundred and thirty-eight, pay the entire amount of the unpaid delinquent taxes for the year one thousand nine hundred and thirty-five and all previous years, whereupon the unpaid penalties and interest and all costs imposed, but not actually paid out, on such paid or unpaid delinquent taxes for the year one thousand nine hundred and thirty-four and previous years, and all unpaid penalties and all costs imposed, but not actually paid out, on paid or unpaid delinquent taxes for the year one thousand nine hundred and thirty-five, shall be abated, and all liens filed for such delinquent taxes, interest, penalties or costs, or any portion thereof, shall be satisfied of record.
72 P.S. § 5571j