In any proceeding before an administrative law judge involving an appeal from a disputed order and notice of assessment or a disputed denial of refund or adjustment, the administrative law judge, after affording the parties a reasonable opportunity for hearing, shall affirm, modify, or set aside the notice of assessment or denial of refund. The parties shall be duly notified of such decision together with the reasons, which shall be deemed to be the final decision unless within thirty days after the date of notification or mailing, whichever is the earlier, of such decision, further appeal is perfected pursuant to the provisions of this title relating to review by the commissioner.