Key facts: Pennsylvania inheritance tax is governed by 20 Pa. C.S. § 3102; tax rates are 0% for surviving spouses, 0% for parents receiving from children under 21, 4.5% for direct descendants, 12% for siblings, and 15% for all other beneficiaries; filing deadline is nine months from death with possible six-month extension; estates with property values below $50,000 may qualify for simplified procedures; interest accrues on unpaid taxes from the due date; and the personal representative bears fiduciary responsibility for compliance.