Taxable activity occurring on an Indian Reservation must be reported separately. The following Tribal region codes should be used in place of county codes for all business activity occurring on an Arizona Indian Reservation. Activity will continue to be reported by TPT class.
For example, if your business has activity on the Cocopah reservation in Yuma County, and it has taxable retail transactions, that activity should be listed on the TPT-1 return in YMB 017 instead of YMA 017. All transactions not located on an Arizona Indian Reservation should continue to be filed under the specific county code