Indiana Code Title 36. Local Government § 36-9-36-55

Sec. 55. (a) An irregularity or error in making a foreclosure sale under this chapter does not make the sale ineffective, unless the irregularity or error substantially prejudiced the property owner.

(b) A property owner has two (2) years from the date of sale in which to redeem the owner's property.  The property owner may redeem the owner's property by paying the principal, interest, and costs of the judgment, plus interest on the principal, interest, and costs at the rate prescribed by IC 6-1.1-37-9(b).

(c) If the property is not redeemed, the sheriff shall execute a deed to the purchaser.  The deed relates back to the final letting of the contract for the improvement and is superior to all liens, claims, and interests, except liens for taxes.