South Korea posted a current account surplus for the third straight month in July, but the surplus plunged as the goods balance turned red for the first time in about 10 years due to fast-rising import costs of energy and other commodities, central bank data showed Wednesday.

The country's current account surplus came to $1.09 billion in July, compared with a surplus of $5.61 billion posted a month earlier, according to the preliminary data from the Bank of Korea (BOK).

The July surplus was also much smaller than the same month a year earlier when the country logged a surplus of $7.71 billion, the data showed.

In the January-July period, the country's cumulative surplus nearly halved to $25.87 billion from a surplus of $49.46 billion tallied the same period a year earlier.

The sharp decline came as the country's import bills mounted at a faster pace than overseas shipments driven by high energy and commodity prices amid the global supply chain disruptions exasperated by the ongoing war in Ukraine.

The country imported $60.23 billion worth of goods in July, up 21.2 percent from a year earlier, while exports grew 6.9 percent on-year to $59.05 billion, the data showed.

Exports in July continued to grow but at a slower pace, affected by such factors as lockdowns in China that led to a decline in demand.

Of inbound shipments, raw material purchases jumped 35.5 percent over the same period, with imports of coal and crude oil surging 110 percent and 99.3 percent, respectively.

As a result, the goods balance that tracks imports and exports posted a deficit of $1.18 billion in July. This marked the first time since April 2012 that the country saw the goods balance turn red.

The BOK said it expected the country could post a current account shortfall in August, considering it recorded an all-time high trade deficit of $9.47 billion in the month.

"The August trade deficit hit a record high, and it will likely have an impact on the goods balance," a BOK official said. "There is a possibility that (the current account balance) could turn to a deficit in August, though we will have to look into service and income accounts."

The service account, which includes outlays by South Koreans on overseas trips and transport earnings, posted a surplus of $340 million in July, compared with a deficit of $490 million the previous month.

The turnaround stemmed in part from high freight rates despite a continued deficit from travel bolstered by eased anti-pandemic restrictions.

The primary income account, which tracks wages of foreign workers and dividend payments overseas, logged a surplus of $2.27 billion in July, down from the previous year's surplus of $2.84 billion, the data showed. (Yonhap)