(a) For out-of-state service credit, military service credit, work experience service credit purchased under Government Code §823.404, USERRA service credit, developmental leave service credit, and unreported service credit, a member may choose to purchase fewer years of service credit than the total years of service credit which the member is eligible to purchase. The years of credit shall be purchased and credited in the order in which they appear on the TRS bill for the purchase.     
      (b) For military service and work experience service credit purchased under Government Code §823.404, the member must complete payment for the number of years of credit that the member has chosen to purchase before purchasing additional years of the same kind of service credit by either lump sum payment or by additional installment payments. A member purchasing USERRA service credit must purchase the service credit by paying the cost of the additional year(s) in a lump sum payment and may not purchase the service credit using the installment payment method. Until August 31, 2013, a member purchasing out-of-state service credit, developmental leave service credit, or unreported service credit under an installment purchase agreement may enter into a second installment purchase agreement for the same type of service credit or may pay the lump sum cost of the additional service credit before completing the purchase of the same type of service credit under the initial installment purchase agreement.     
      (c) A member must purchase all withdrawn service credit and may not choose to purchase this type of service credit in yearly increments. A member will not receive any credit for withdrawn service until the entire balance due and all fees have been paid.     
     Source Note:        The provisions of this §25.182 adopted to be effective September 1, 1992, 17 TexReg 5120; amended to be effective June 1, 1995, 20 TexReg 3733; amended to be effective March 12, 2003, 28 TexReg 2100; amended to be effective April 1, 2011, 36 TexReg 1839; amended to be effective January 5, 2012, 36 TexReg 9341; amended to be effective January 1, 2016, 40 TexReg 9727