La. Stat. tit. 33 § 205
The taxes levied or imposed by one of the constituent municipalities, remaining outstanding and unpaid, and all other moneys due and owing such municipality when the consolidation becomes effective shall be collected by the new municipality and shall be applied to the purposes for which raised or owing, and if not raised or owing for a specific purpose, shall be applied to the reduction or payment of the bonded or other indebtedness, if any, of the constituent municipality.
Proceedings pending to endorse the payment or collection of taxes in any of the constituent municipalities shall be carried to completion by the proper officers of the new municipality; and all taxes theretofore levied by any of the constituent municipalities shall be valid and effectual as if originally levied and assessed by the officers of the new municipality. The governing body of the new municipality may perform all necessary acts to confirm and effectuate such levies.
La. R.S. § 33:205