Industries in Irosin are primarily agriculture-based. In 2009, there are only 14 registered establishments belong to the secondary sector where nine are rice mills, two are engaged in construction, an organic fertilizer center, a furniture manufacturer and a coco-fiber stitching plant. A number of home-based food and meat processors producing pili nut candies, local sausages and meat preserves are also noted. Most of the existing local industries are light and generate non-hazardous wastes. Few handicraft producers still thrive while a number already closed shop due to a significant decrease in foreign demand, economic slowdown and the scarcity of raw materials.
There are 285 registered businesses from the tertiary sector in 2009 which are engaged in trade, transportation, finance and business service, and community, social and personal services. Majority of these establishments are wholesale and retail stores selling various kinds of merchandise. Meat, fish and vegetable dealers rank second in terms of number. There are also service shops, eateries, bakeries, food processors, drugstores, and amusement centers and video shops. Buying stations are found along M. L. Quezon Street where copra, palay and abaca are traded. Agricultural supplies, automotive parts dealers, appliance dealers and gasoline/refilling stations are also thriving.
Trading and business transaction in Irosin are concentrated mainly at the Central Business District (CBD) in the town center. The highlights of CBD are the Irosin Public Market, Municipal Hall, Public Auditorium and the line of commercial establishments where commodity trading stations, wholesale and retail variety stores, banks and service shops are found. Presently, a commercial strip is growing from the corner of J. P. Rizal and M. L. Quezon Streets stretching all the way to the Maharlika Highway.
The financial institutions in Irosin are the Rural Bank of Irosin (RBI), a branch of Land Bank of the Philippines (LBP), Camalig Rural Bank, Guinobatan Rural Bank, Cebuana Lhuiller Pawnshop, Tambunting Pawnshop, and Irosin Market Vendors and Farmers Development Cooperative (IMVEFADECO). The Land Bank of the Philippines-Irosin Branch caters to a wide range of customers from local government units, cooperatives as well as commercial and industrial establishments from micro to large enterprises. The bank likewise accept savings, current and time deposits and foreign currency exchange particularly dollar and serves as a collecting agency of the Bureau of Internal Revenue (BIR), Social Security System (SSS) and Philippine Health Insurance. The Rural Bank of Irosin on the other hand offers production loan to farmers and livestock raiser, business financing to market vendors, retailers and service enterprises it also accepts savings and time deposit.
The increasing population in the rural barangays led to the setting up of barangays centers where public markets, chapel, health centers, barangay halls and multi-purpose pavements are normally clustered. Such centers are located in the barangays of Gabao, Batang, Monbon, Patag and Gulang-Gulang. Of the convergence areas Gabao is the most progressive.