(a) Each pharmaceutical service provider that collected and remitted the supplemental privilege tax on pharmaceutical services pursuant to Article 1A, as it read prior to August 30, 2016, shall be entitled to a refund of the taxes collected in the form of a credit against any future taxes levied pursuant to the privilege tax on pharmaceutical services provided for in this article, due after August 30, 2016. Beginning October 1, 2016, monthly credits shall be allowed to the pharmaceutical service providers that remitted the supplemental privilege tax through September 20, 2018.
(b) On or after October 1, 2018, a pharmaceutical service provider who is entitled to a credit under subsection (a) and has unused credit remaining shall be entitled to a refund of the remaining credit owed to the provider, without interest, upon petition to the department. The petition shall be made no later than October 1, 2020. The department shall establish procedures to implement this subsection.