The amount of each purchase shall be not less than one year of creditable nonintervening military service.
The salary deduction amortization plans agreed to by members and the board may include a deferral of payment amounts and statutory interest until the termination of school service or state service as the board in its sole discretion decides to allow. The board may limit salary deduction amortization plans to such terms as the board in its sole discretion determines. In the case of an eligible school employee who is an active member of the public school employees' retirement system, the agreed upon salary deductions shall be remitted to the public school employees' retirement board, which shall certify and transfer to the board the amounts paid.
The earliest possible superannuation age shall be the age at which the member becomes first eligible for superannuation retirement assuming continued full-time service and credit for the amount of service which the member has elected to purchase, or the current attained age of the member, whichever is later. The full actuarial cost of the increased benefit attributable to the purchased service shall be the actuarial present value of a deferred annuity equal to the amount of the increased benefit determined above, beginning at the earliest possible superannuation age and payable for life, calculated using a preretirement interest assumption of 1.5%, a postretirement interest assumption of 4%, no preretirement mortality assumption and standard postretirement mortality assumptions. The purchase payment shall be made in lump sum by the member within 30 days of certification by the board of the required purchase amount or may be amortized through salary deductions in amounts agreed upon by the member and the board with interest payable on the unpaid balance at the rate applicable to the most recently issued 30-year bonds of the United States Treasury Department.
71 Pa.C.S. § 5505