Ark. Code Ann. § 14-90-902

Within forty (40) days after the passage of a municipal improvement district assessment ordinance, unless the time is extended by the city or town council, the city clerk or town recorder shall deliver to the county tax collector a certified copy of the assessment of benefits containing a description of the blocks, lots, and parcels of land in the district and the amount assessed on each, duly extended against each lot, block, or parcel of land and a certified copy of the ordinance fixing the percent to be collected each year.