22 U.S. Code § 4071f - Government contributions
(a) Each agency employing any participant shall contribute to the Fund the amount computed in a manner similar to that used under section 8423 (a) of title 5 pursuant to determinations of the normal cost percentage for the Foreign Service Pension System by the Secretary of State.
(1) The Secretary of State shall compute the amount of the supplemental liability of the Fund as of the close of each fiscal year beginning after September 30, 1987. The amount of any such supplemental liability shall be amortized in 30 equal annual installments with interest computed at the rate used in the most recent valuation of the System.
(2) At the end of each fiscal year, the Secretary of State shall notify the Secretary of the Treasury of the amount of the installment computed under this subsection for such year.