S.C. Code § 12-6-2295
2018 Act No. 265, Section 7.B, provides as follows:
"B. This SECTION takes effect upon approval by the Governor and applies to all open tax periods excluding assessments under judicial review as of the date of the Governor's approval."
2019 Act No. 49, Section 2, provides as follows:
"SECTION 2. This act takes effect upon approval by the Governor and applies to all open tax periods excluding assessments under judicial review as of the date of the Governor's approval."