After rounds of failed negotiations, chief delegates from the two countries last month agreed on Seoul paying about 1.04 trillion won ($924 million) in 2019 for the U.S. military presence, up from about $830 million last year.
President Donald Trump earlier pressured Seoul to increase its share, triggering worries in South Korea that he might withdraw some of the 28,500 U.S. troops here if Seoul refused to accept his demand.
South Korean Foreign Minister Kang Kyung-wha and U.S.
Ambassador Harry Harris signed the new cost-sharing deal on Friday.
The deal requires parliamentary approval in South Korea.