34 Tex. Admin. Code § 25.82
(a) The cost of establishing out-of-state service is 12% per year of the full annual salary rate for the first year of service in Texas which is both after the out-of-state service and after September 1, 1956. Annual salary is limited to $8,400 for years prior to September 1, 1969, and $25,000 for years after September 1969 but before September 1, 1979. No limit exists for years after September 1, 1979. In addition a crediting fee of 8.0% compounded annually of the amount of deposits due and paid shall be charged from the end of the school year in which the member was first eligible to purchase credit for such service until payment for the credit is received. The date of first eligibility to purchase credit for any year of out-of-state service shall be the latest of the following dates:
Source Note:The provisions of this §25.82 adopted to be effective January 1, 1976; amended to be effective September 26, 1979, 4 TexReg 3305; amended to be effective October 1, 1982, 7 TexReg 3367.