Under the agreement, the import tax on automobiles from ASEAN members to Vietnam would fall from 50% to 40% by 2016, to 30% by 2017 and 0% by 2018.
Vietnam's special consumption tax on cars will fall to 40% from 45% on July 1.
Thailand has become the leading exporter of automobiles to Vietnam in the first four months of this year, with 10,155 units, accounting for 35% of total car imports, according to the Vietnamese Ministry of Industry and Trade.
Under the agreement, the import tax on automobiles from ASEAN members to Vietnam would fall from 50% to 40% by 2016, to 30% by 2017 and 0% by 2018.
Vietnam's special consumption tax on cars will fall to 40% from 45% on July 1.