Employer contribution rates In Iowa can range from 0.0% to 9.0% depending on an individual employer's benefit experience and the rate table in effect. This dataset summarizes UI contribution rate data for both private experienced rated employers and firms receiving a new employer rate by rate year. Data is based on a snapshot of the IWD contribution rate notice database. Data includes private experience rated employers and private employers receiving new employer contribution rates. Reimbursable employers and government contributory employers are excluded.