When a political subdivision issues a certificate of indebtedness under this chapter, the political subdivision, by resolution authorizing the issuance of the certificate of indebtedness, shall establish a sinking fund for the retirement of the certificate of indebtedness, including interest, on its due date. The resolution must also provide for the regular accumulation of money in the sinking fund from the revenues pledged to the payment of the certificate of indebtedness. Upon the accumulation of sufficient money in the sinking fund to pay the principal and interest which will be due and owing on the maturity date of the certificate of indebtedness, no additional revenues may be credited to the sinking fund.
21-02-08. Percentage of current taxes used to pay delinquent certificates of indebtedness. If sufficient funds are not collected to retire outstanding certificates of indebtedness issued wholly or in part against revenues that consist of uncollected taxes within two months after their due date, there must be set aside monthly from current tax collections, exclusive of tax levies dedicated to the payment of principal of and interest on outstanding evidences of indebtedness, not less than ten percent of the amount of the collections until the past due certificates have been paid.