Idaho Semi Annual Report Workers Compensation Premium Tax is a required tax paid by employers in the state of Idaho to the Idaho Industrial Commission (IIC). This tax is based on the amount of workers’ compensation premiums that employers pay to insure their employees against work-related injuries and illnesses. The Idaho Semi Annual Report Workers Compensation Premium Tax must be paid by all employers who are subject to Idaho’s workers’ compensation laws. The tax is paid twice a year, and the report and payment must be submitted by the 15th day of the 6th month after the end of the employer’s semi-annual period. There are two types of Idaho Semi Annual Report Workers Compensation Premium Tax: the regular and the excess tax. The regular tax rate is 3 percent of the total premiums paid during the semi-annual period. The excess tax rate is 4.5 percent of the total premiums paid.