The Bank of Korea (BOK) forecast that this year's current account surplus will amount to $84 billion, compared with a record high of $79.9 billion set in 2013.
In September alone, the surplus totaled $7.62 billion, up $420 million from the previous month.
However, BOK officials raised concerns about what they called "a surplus stemming from a decrease in imports caused by sluggish domestic consumption."
Imports in the January-September period inched down 0.3 percent from a year earlier, while exports rose 2.4 percent over the cited period, according to the BOK.