Minnesota Constitution Art. XI, § 6. Certificates of indebtedness

Sec. 6. As authorized by law certificates of indebtedness may be issued during a biennium, commencing on July 1 in each odd-numbered year and ending on and including June 30 in the next odd-numbered year, in anticipation of the collection of taxes levied for and other revenues appropriated to any fund of the state for expenditure during that biennium.

No certificates shall be issued in an amount which with interest thereon to maturity, added to the then outstanding certificates against a fund and interest thereon to maturity, will exceed the then unexpended balance of all money which will be credited to that fund during the biennium under existing laws. The maturities of certificates may be extended by refunding to a date not later than December 1 of the first full calendar year following the biennium in which the certificates were issued. If money on hand in any fund is not sufficient to pay all non-refunding certificates of indebtedness issued on a fund during any biennium and all certificates refunding the same, plus interest thereon, which are outstanding on December 1 immediately following the close of the biennium, the state auditor shall levy upon all taxable property in the state a tax collectible in the ensuing year sufficient to pay the same on or before December 1 of the ensuing year with interest to the date or dates of payment.