Ind. Code § 6-1.1-22-11

Sec. 11. A holder of a lien of record on any real property on which taxes are delinquent may pay the delinquent taxes, penalties, and cost. The amount so paid is an additional lien on the real property in favor of the lienholder and is collectible, with interest at ten percent (10%) per annum from the time of payment, in the same manner as the original lien.