Tex. Gov't Code § 1501.210
After money has been deposited with the bank where the outstanding district bonds are payable, the district or the municipality may pay off any outstanding district bonds if the money and investments that would remain to the credit of the interest and sinking fund are sufficient to provide for the payment of:
(2) the interest on the remaining outstanding bonds of the district to:
Added by Acts 1999, 76th Leg., ch. 227, Sec. 1, eff. Sept. 1, 1999.