Whenever applicable law permits a governmental unit to issue warrants in anticipation of taxes to be levied or other funds to be received, the governing body of such governmental unit may cause such warrants to have a specified due date reasonably calculated to be after the receipt of the taxes or other revenues anticipated, may designate and so cause such warrants to be general obligation bonds within the meaning of this Act, may provide for refunding warrants or general obligation bonds to refund such warrants should the taxes or other revenues to pay the same be delayed or insufficient to pay the same, and may provide for the separate levy of taxes, without limitation as to rate or amount, on all ad valorem taxable property within the governmental unit, to pay such warrants or refunding warrants or bonds. Nothing herein shall authorize the issuance of warrants in excess of the amount otherwise permitted by applicable law. The county collector shall deposit any amount of tax proceeds pledged to the payment of warrants of any governmental unit, in accordance with the authorization of such governmental unit, directly into a designated escrow account established by the governmental unit. The ordinance authorizing such disposition shall be filed with the county collector or collectors of the county or counties within which taxable property of the governmental unit is located. Warrants initially issued pursuant to this Act shall not be regarded as or included in any computation of indebtedness for the purpose of any statutory provision or limitation. General obligation bonds to refund warrants issued hereunder or refunding warrants may be issued without regard to existing indebtedness but upon being issued shall be included and regarded as indebtedness.