South Korea government bond clock speeds up the countdown: In 2030, it may approach 60% of GDP, and fiscal pressure continues to rise

South Korea’s national debt is accelerating upward. According to reports, in the 2025 Fiscal Year National Settlement Report released by the South Korean government, the country’s national debt (D1) is provisionally estimated to reach 1,304.5 trillion won in 2025, up by 129.4 trillion won from the previous year. Not only does this set the largest year-over-year increase on record, it also lifts the ratio of government bonds to gross domestic product (GDP) from 46.0% in 2024 to 49.0% in one jump, marking the biggest increase in nearly five years.

South Korea’s national debt will increase by 121 trillion won every year

Looking at historical trends, since South Korea’s national debt total began being tracked under the current standards in 1997, there has never been a year-on-year decline in the total amount; the overall figure keeps rewriting new highs year after year. In the past, an increase of more than 100 trillion won in a single year occurred only in three years: 2020, 2021, and 2025. The year-over-year growth rate of national debt in 2025 is about 11%, which is also the fastest pace in four years after 2021’s 14.7%. This indicates that the speed of fiscal deterioration is once again heating up.

So-called national debt (D1) refers to definite debts that the government is directly obligated to repay, including the combined total of central government debt and local government net debt. As the scale of debt continues to balloon, South Korea’s ratio of government bonds is also rising rapidly. During the COVID-19 shock period in 2020, that ratio surged by 5.7 percentage points. Then from 2021 to 2023, the increase narrowed year by year; in 2024 it even dipped slightly by 0.8 percentage points at one point, but in 2025 it bounced back clearly again, suggesting that pressure on the fiscal structure has reappeared.

What’s even more worth关注 is that the prospect of a year-over-year increase of 100 trillion won may no longer be a special case, but instead could become a “new normal” in the coming years. South Korea’s government, in the 《2025 to 2029 National Fiscal Operations Plan》 submitted to the National Assembly in September last year, estimated that national debt would rise to 1,415.2 trillion won in 2026, to 1,532.5 trillion won in 2027, to 1,664.3 trillion won in 2028, and again to 1,788.9 trillion won in 2029. From this year through 2029, South Korea’s national debt is expected to increase by an average of about 121 trillion won per year.

South Korea’s government bond debt-to-GDP ratio in 2030 may exceed 60%

South Korea’s government bond debt-to-GDP ratio will also continue to be pushed higher. Official estimates show that the national debt ratio will rise from 51.6% in 2026 steadily to 53.8% in 2027, 56.2% in 2028, and then 58.0% in 2029. If it continues further, the risk of approaching and even crossing the 60% threshold in 2030 is rapidly increasing.

The problem is that South Korea’s official fiscal projections themselves are also continuing to worsen. For example, take the national debt ratio for 2028: the government originally projected it at about 50.5% in 2024, but by 2025 it had significantly revised the estimate upward to 56.2%, increasing by 5.7 percentage points in just one year. This also reflects that the original assumptions about fiscal conditions and the economy are becoming increasingly difficult to maintain, and that the trajectory of debt in the future may further deteriorate.

Uncertainty in the external environment further compounds the issue. The report notes that higher energy prices and supply chain pressures brought by the Middle East war are casting a shadow over the global economy. If South Korea’s fiscal spending expands due to external risks, or if GDP growth—serving as the denominator—falls short of expectations, the pace at which the national debt ratio rises could accelerate even further.

The Organisation for Economic Co-operation and Development (OECD) has recently already lowered its forecast for South Korea’s economic growth. It reduced this year’s growth rate by 0.4 percentage points from the level projected in last December to 1.7%. The OECD said that South Korea and Japan have a high dependence on Middle East energy imports. If fighting in the Middle East leads to energy supply becoming tight, it will put pressure on production activities. The Bank of Korea also said in its April 10 monetary policy statement that, affected by rising energy prices and supply disruptions, South Korea’s economic growth rate this year could be lower than the 2.0% forecast made in February.

Academic circles have also begun issuing warnings. Kim Woo-cheol, president of the Korea Institute of Public Finance and a professor in the Department of Taxation at the University of Seoul, said that general government debt (D2) directly affects sovereign credit ratings. Once the D2-to-GDP ratio exceeds 60%, the three major international credit rating agencies may start monitoring when South Korea’s national credit rating might be downgraded. For South Korea, this is not only a bookkeeping fiscal figures problem; it could further affect government financing costs, stability in financial markets, and future room for policy actions.

Overall, South Korea’s national debt clock is clearly speeding up. From the 129.4 trillion won surge in 2025 alone, to an additional increase of more than 120 trillion won per year on average over the next four years, and then to the IMF’s estimate that in 2030 general government debt will reach 64.3% of GDP—all of this shows that South Korea’s fiscal situation is at a critical turning point. If economic growth continues to slow, geopolitical risks continue to rise, and government spending cannot be brought under control, South Korea may face pressure from all three fronts—fiscal discipline, economic growth, and credit ratings—earlier than expected.

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