Y*/Y or 16.667/Y
where Y= total number of years of credited service and Y* = total years of credited service if the member were to continue as a school employee until attaining superannuation age, or if the member has attained superannuation age then the number of years of credited service. For purposes of calculating a disability annuity for a member of Class T-G or Class T-H, the standard single life annuity shall equal 2% of the final average salary, multiplied by the total number of years and fractional part of a year of service credited for such class of service. In no event shall the disability annuity plus any cost-of-living increases be less than $100 for each full year of credited service. The member shall be entitled to the election of a joint and survivor annuity on that portion of the disability annuity to which he is entitled under section 8342 (relating to maximum single life annuity).
does not return to school service may file an application with the board for an amount equal to the accumulated deductions, shared-risk member contributions and statutory interest standing to his credit at the effective date of disability less the total payments received on account of his member's annuity.
24 Pa.C.S. § 8344