According to the IRD announcement,VAT Registration of persons of whose taxable supply has never exceeded Rs.75 million for any taxable period ended prior to December 31, 2019, will be inactivated with effect from January 01, 2020

if any any one who entire above condition,such persons will also be inactivated with effect from January 01, 2020

According to this notice, IRD separetly adivice how to deal with RIS and what should do to SVAT credit vouchers what they used before inactivation.

For more details please follow below link