Streamlined Sales Tax - Rates and Boundaries Databases

Merchants are responsible for calculating correct Iowa Sales Tax.

Iowa Department of Revenue provides files containing the Tax Rate and Tax Boundary tables needed by merchant systems to determine the correct tax rate for an Iowa address on a given date. Iowa releases files semi-annually, by June 1 for rates that are effective July 1 and by December 1 for rates that are effective January 1.

Merchants may download these data files from the Streamlined Sales Tax Governing Board Web site.