Section 180(4) in The Coimbatore City Municipal Corporation Act, 1981
(4)When any part of a sinking fund is invested in Tamil Nadu Municipal debentures, or is applied in paying off any part of a loan before the period fixed for repayment, the interest which would otherwise have been payable on such debentures or on such part of the loan shall be paid into the sinking fund and invested in the manner laid down in sub-section (2).
