The St. Landry Parish Assessor is responsible for discovery, listing, and valuing all property in St. Landry Parish for ad valorem tax purposes. This property includes all Real Estate, all Business Movable Property (Personal Property), and all Oil & Gas Property and Equipment. The Assessor is responsible to the citizens of St. Landry Parish to ensure all property is assessed in a fair and equitable manner. At the same time, the Assessor is responsible for ensuring that the assessments are calculated according to the Constitution of the State of Louisiana and the Revised Statutes that are passed by the Legislature. The Assessor is also responsible for filing the annual Tax Roll with the Louisiana Tax Commission. In addition, the Assessor must maintain the legal description of each property parcel, as well as maintain the ownership inventory of each parcel.

The St. Landry Parish Tax Collector, which is the St. Landry Parish Sheriff, is responsible for sending tax bills and collecting taxes based on the assessments and the millage rates. The annual parish tax bills are sent out in the latter part of the year and are due by December 31 of that year.

The different governing bodies within the parish set millage rates for the parish. These governing bodies include the St. Landry Parish School Board, St. Landry Parish Council, St. Landry Parish Sheriff, St. Landry Health Unit and others. Also there are additional millages set for the Individual Fire Districts, Roads, Library, Drainage, etc. St. Landry Parish has 8 Parish wide taxing districts, 33 special taxing districts, and 10 municipal taxing districts. These millages depend upon the location of the property.