The Board of Aldermen has calculated property tax bills for fiscal 2013, which will result in a 2.3 percent increase for homeowners and a 4.7 percent increase for commercial/industrial property owners. On average, homeowner’s tax bills will increase by $119.01, to $5,212.39, and business owner’s bills will go up by $443.92, to an average of $9,728.55, according to data prepared by the city assessor’s office.