On January 3, 2023, the Ministry of Labour, War Invalids and Social Affairs issued Circular No. 01/2023/TT-BLDTBXH prescribing the rate for adjusting the monthly salary and income for which social insurance premiums are paid, replacing Circular No. 36/2021/TT-BLDTBXH. Circular 01 takes effect from February 20, 2023, but it applies to the relevant subjects of application from January 1, 2023.