Tex. Government Code § 403.102

(a) The federal revenue sharing trust fund exists to receive money authorized under the federal revenue sharing law (31 U.S.C. Section 6701 et seq. (1983)) and money earned by the use of that money. Expenditures from the fund must be authorized by the legislature. The comptroller shall administer the fund and may adopt rules providing for the availability of money for use among the entities funded from the fund. Costs related to salary and wages for employer contributions to the state retirement programs, to the Federal Old Age and Survivors Insurance Program (42 U.S.C. Section 401 et seq. (1983)), and for the unemployment benefit program computed at the maximum contributor rate shall be applied to salaries and wages paid from the fund and credited to the general revenue fund.

(b) To ensure that the state obtains full benefit of the federal revenue sharing trust fund, the comptroller may invest money in the fund that is determined to exceed cash requirements for current expenditures in:

(1) direct obligations of, or obligations the principal and interest of which are guaranteed by, the United States;

(2) direct obligations of or participation certificates guaranteed by the Federal Intermediate Credit Bank, Federal Land Banks, Federal National Mortgage Association, Federal Home Loan Banks, or Banks for Cooperatives;

(3) savings and loan associations insured by the Federal Savings and Loan Insurance Corporation;

(4) certificates of deposit of a bank or trust company the deposits of which are fully secured by a pledge of securities listed in Subdivisions (1)-(3);

(5) other securities made eligible by law for this investment; or

(6) any combination of those investments.