Iowa Workforce Development- Unemployment Tax 1 Iowa Department of Revenue - Income Tax Withholding 1 Iowa Unemployment Iowa Workforce Development - Unemployment Iowa Income Tax Withholding Iowa Department of Revenue - Income Tax Withholding Wage: US-IA Unemployment WAGE_US_IA_UNEMP ER: US-IA Unemployment ER_US_IA_UNEMP EE: US-IA Income Tax Withholding EE_US_IA_INC_WITHHOLD