Irosin is a second-class municipality with a revenue target of Php 78,782,096 in 2012. The two major sources of are local sources and external sources. Local generated income comprises tax which is 4.78% of the total income, non-tax revenues which is 2.27%, and income from economic enterprise which represents 3.22%. Revenues from external sources consist of share from Internal Revenue Allotment which is 89.73 of the total income in 2010.

The budget of expenditures comprises four major expense class namely personal services which accounts for 48% of obligations, maintenance and other operating expenses which is 22%, capital outlay at 1%, and special purpose fund which is 29% of the total expenditures.