In this section, “legal holiday” means: the day on which a legal holiday, as defined in § 1–111 of the General Provisions Article, is observed; or a federal legal holiday. Notwithstanding any other law, when under State or local law, the last day to pay a tax, file a tax return or perform any other act that relates to taxes under this article falls on a Saturday, Sunday, or legal holiday, performance of the act is considered timely if the act is performed on the next succeeding day that is not a Saturday, Sunday, or legal holiday. For purposes of this section, the last day to perform an act is the last day of any authorized extension of time.