Indiana Code Title 6. Taxation § 6-3.6-4-3

Sec. 3. If there are bonds or leases outstanding that are payable from a tax imposed under IC 6-3.5-1.1 (before its repeal January 1, 2017), IC 6-3.5-6 (before its repeal January 1, 2017), IC 6-3.5-7 (before its repeal January 1, 2017), IC 6-3.6-6, or IC 6-3.6-7 (but not IC 6-3.6-5), the adopting body may not reduce the tax rate below a rate that would produce one and twenty-five hundredths (1.25) times the total of the highest annual outstanding debt service plus the highest annual lease payments plus any amount required under the agreements for the bonds or leases to be deposited in a sinking fund or other reserve, unless:

pledges all or a part of its share of revenues from the tax imposed under IC 6-3.6-6 or IC 6-3.6-7 (but not IC 6-3.6-5) for the life of the bonds or the term of the lease, in an amount that is sufficient, when combined with the amount pledged by the city, town, or county that issued the bonds, to produce one and twenty-five hundredths (1.25) times the total of the highest annual outstanding debt service plus the highest annual lease payments plus the amount required under the agreements for the bonds or leases to be deposited in a sinking fund or other reserve.