Ind. Code § 6-9-20-9
With respect to bonds, leases, or other obligations for which a pledge of revenues of the food and beverage tax imposed under this chapter has been made by the county as set forth in section 8.7 or 8.9 of this chapter, and bonds issued by a lessor that are payable from lease rentals, the general assembly covenants with the county, the most populated municipality in the county, and the purchasers or owners of the bonds or other obligations described in this subdivision that this chapter will not be repealed or amended in any manner that will adversely affect the imposition or collection of the food and beverage tax imposed by this chapter as long as the principal of any bonds, the interest on any bonds, or the lease rentals due under any lease are unpaid.
IC 6-9-20-9