California Code
ARTICLE 3 - Refunding Indebtedness
Section 43731.

43731. If the earliest maturity of the refunding bonds is more than one year after the date of issuance, the legislative body shall levy and collect annually a tax sufficient to pay the interest as it falls due and to constitute a sinking fund for payment of the principal on or before maturity.

(Added by Stats. 1949, Ch. 79.)