This information is intended to provide general information about the Dewey-Humboldt transaction privilege tax code. The Arizona Department of Revenue (ADOR) administers the Dewey-Humboldt transaction privilege tax (TPT). You will obtain your TPT license, file your TPT returns, and make your tax payments through ADOR. ADOR will process your returns and maintain your TPT accounting records. The ADOR offers an excellent website located at https://azdor.gov/transaction-privilege-tax-tpt from which you can obtain forms and information pertaining to your business taxes.