The two sides are scheduled to exchange a written notification Tuesday that they have completed domestic procedures for the implementation of an updated arrangement, the Ministry of Trade, Industry and Energy said.
The move comes after Seoul and Washington carried out negotiations on how to revise their original free trade deal, which went into effect in 2012. The US mainly focused on tackling its deficit in the auto sector.
"The role of the South Korea-US FTA will be to further strengthen the basic framework of the already strong relations," the ministry said.
Under the revised accord, the US will hold onto the 25 percent tariff on Korean-made pickup trucks for another 20 years to 2041.
It also obliges Seoul to double the 25,000-vehicle unit threshold for US car imports that do not have to comply with domestic industry regulations, which would enable 50,000 vehicles to enter South Korea more easily.
Seoul will also apply eased vehicle emission standards for cars shipped from 2021-25 when setting new import regulations. US manufacturers have complained that the environmental regulations act as a non-tariff barrier for their cars.
The ministry has said the new agreement on the investor-state dispute settlement clause, and anti-dumping and countervailing duty proceedings would help improve transparency in dispute settlement processes.
While investors could sue countries through international arbitration bodies for alleged discriminatory practices under the present ISDS provision, the two sides added clauses to prevent potential abuse of the arbitration system by multinational companies and to better safeguard the right of the public. (Yonhap)