The local economy of Irosin is basically agricultural. About 46% of gainful workers rely on crop production and farm labor for livelihood and sustenance. Agricultural lands comprise 79% of the total land area of the municipality or an approximate area of 11,715 hectares. Coconut occupies about 79% of the total agricultural lands, followed by palay at 18%, while other crops occupies only 3%. The total peso-value of the agricultural crop production in 2013 is estimated to be P 553,384,044.

Palay, the staple food of many Filipinos is the primary crop being produced constituting 39% of the total peso-value of the total agricultural crop production. In 2013, a total of 15,874.93 metric tons of palay was produced where the average yield per hectare per year is 7,640 kilograms. The supply of palay is sufficient enough to meet the demand of the population with surplus being shipped-out and sold to neighboring municipalities and even reaches as the islands of Samar and Masbate.

Coconut, the local commercial export crop, rank second in terms of volume produced. Coconut constitutes 24.94% of the total estimated peso-value of the entire agricultural crops produced and the yield is estimated at 9,202 metric tons of copra in 2013. Banana and pili rank third and fourth in terms of peso-value with 17.84% and 8.04% of the total peso-value of total crop production. The local production of vegetables and legumes is estimated at 6,066 metric tons while the root crop production is at 384 metric tons in 2013.

Various support infrastructures to agriculture are in place catering to the needs of farmers and agricultural workers. Agricultural farms facilities are mostly for palay production. These include hand tractors, sprayers, irrigation system, solar and mechanical dryers, threshers, rice mills and storage facilities, and farm-to-market roads.

Poultry and livestock are secondary sources of income of most farming families in Irosin. Swine and chicken whether native or hybrid is raised by more families compared to the other species of livestock and fowls. Swine are usually grown in the backyard for very small-scale commercial purposes with breeding stocks ranging from 2 to less than 7 breeders. The present cattle population in the municipality is still very miniscule. Carabaos are usually raised and utilized for farm labor as substitute to tractors but there are those who sell carabaos to traders. Native and hybrid chicken are either raised for household consumption or sold in the neighborhood or in the market whenever the family is in need of additional cash. Few families raise goats and other domestic food animals either for commercial or domestic consumptions. The total peso-value of livestock and poultry production in 2013 is estimated at P 37,337,950. There were 3,709 swine, 24,323 chickens, 5,471 ducks, 584 carabaos, 327 goats and 110 cattle produced.