Time-Dependent Tax (TDT) is a new functionality that enables customers to create and maintain VAT tax code changes by themselves. Once the TDT functionality is rolled out for a country/region, all the existing customers of that country/region must activate TDT in order to maintain, change or create VAT tax codes. The VAT tax codes for these countries/regions can no longer be created or changed with the help of SAP Expert Configuration team.
For more information about TDT, please refer to this document.
Thanks for sharing! Additionally refer https://go.support.sap.com/roadmapviewer/#/group//roadmap/IMPS4HANACLDENMGMT/node/901B0E6D3F441ED78DE8F084DE1F8E7B as well for configuring taxes and more info...