Sec. 53.186.  INTEREST AND SINKING FUND.  (a)  A district shall have an interest and sinking fund.  The board shall credit to this fund all taxes collected for the payment of interest or redemption of district bonds.
(b)  The board shall use money in this fund only:
(1)  to pay interest on district bonds;
(2)  to cancel and surrender district bonds;  and
(3)  to pay the expenses of assessing and collecting the taxes.
Acts 1971, 62nd Leg., p. 418, ch. 58, Sec. 1, eff. Aug. 30, 1971.