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The OECD moved Korea's 2026 growth forecast two points in six months
Semiconductor exports and chip investment took the OECD's 2026 forecast for South Korea from 1.7% in March to 3.7%, the largest upgrade in the G20. Korea's own institutions sit half a point lower, at 3.2%.
The Investor · Invest desk
What happened
- The OECD put South Korea's 2026 growth at 3.7% on the 23rd, up 1.1 percentage points from the 2.6% it forecast in June and the largest upward revision among the G20 economies.
- Measured against the 1.7% the OECD projected for Korea back in March, the forecast has travelled two full percentage points in six months.
- The Asian Development Bank raised its 2026 Korea forecast the same day to 3.2% from 2.6%, citing firm manufacturing indicators and AI chip demand feeding through to export growth.
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Why it matters
- contradiction Half a point separates the OECD from the ADB and the KDI on the same calendar year, so anyone quoting 3.7% as the consensus for Korea is quoting the outlier of the four.
- decision A planner sizing capacity or a sovereign trade off 3.7% is sizing off a single year, because the same OECD table has Korea at 2.6% in 2027 while the world runs 3.0%.
- exposure Korea's upgraded export line depends on capital budgets at AI companies whose profitability and leverage the OECD itself named as the thing to watch.
- cost Households face 3.0% inflation this year, four tenths of a point more than the OECD assumed in June, before any of the chip revenue reaches wages.
Four forecasters moved the same way and ended at different levels. The OECD's 3.7% for 2026 sits half a point above the 3.2% that both the Asian Development Bank and the Korea Development Institute now carry [1][6][7][1]. It is 0.4 above the Bank of Korea's 3.3% [8][5]. The size of the moves differs too: 1.1 points at the OECD, against 0.6 at the ADB and 0.7 at each of the BOK and the KDI [4]. All four are above 3%, and the OECD alone is above 3.5% [8].
The institutions disagree about how long the cycle lasts. The OECD has Korea at 2.6% in 2027, against a world at 3.0% [2][5]. An economy running 0.8 points ahead of global growth this year runs 0.4 points behind it next year. That is a swing of 1.2 points [2]. The implied deceleration from 3.7% to 2.6% is 1.1 points, the same size as the upgrade just delivered [3]. The Bank of Korea sits 0.3 above the OECD for 2027, at 2.9%, on the judgment that the semiconductor cycle will run into next year [8][6].
The OECD attributed this year's expansion to strong export and output growth, with exports leading again next year and consumption recovering gradually [15]. It said the spread of AI is supporting investment, output and trade worldwide, Korea included [9]. It judged that economies are showing considerable resilience to external shocks such as the war in the Middle East while AI-related investment continues [16]. Korea's export growth here depends on capital spending decided inside other companies' budgets. In the same set of forecasts, the OECD said concerns about the profitability of AI-related companies and their heavy reliance on leverage bear watching [12].
Prices are where the two same-day forecasts split. The OECD raised Korea's 2026 inflation projection to 3.0% from 2.6% and its 2027 projection to 2.7% from 2.2%. It cited the sharply higher growth outlook and higher international energy prices than it assumed in June [10]. The ADB left this year at 2.7% and expects about 2.2% next year as energy pressure eases and tighter monetary policy comes through [14]. Three tenths of a point separates them on what households pay [7]. Korea's projected inflation stays below the G20 averages of 4.1% and 3.6% for the two years [11].
If AI capacity is being built across several years, the revisions that come next are to 2027, and the BOK is already there at 2.9% [8]. The weaker part of the chips-move-GDP reading is the composition of the upgrades. The ADB also cited expansionary fiscal policy and a gradual recovery in private consumption on the back of improved corporate earnings [17], so some of the 0.6 points it added is domestic demand [4]. The OECD's named downside risks are energy prices climbing further, supply shocks from adverse weather such as El Nino, and higher long-term government bond yields. Its upside is an early end to the war in the Middle East [13].
What to watch
- Whether the Bank of Korea's 2.9% for 2027 survives its next round or converges toward the OECD's 2.6%.
- Whether the ADB and KDI mark 2026 up from 3.2% toward the OECD's 3.7% at their next revisions.
- Whether energy prices stabilize from the fourth quarter as the OECD assumed, since its inflation mark-up rests on that path.