Why the won stays weak while exports boom — and what September's FX reform changes

Here is a puzzle that has been irritating Korea-watchers for three years. Korea sells the world semiconductors, ships, cars and batteries. It runs a substantial current-account surplus. Its export numbers in the AI cycle have been excellent.

And its currency keeps weakening.

USD/KRW sat around 1,415 on 12 August 2026 — stronger than a month earlier by roughly 5.5%, but still down about 2.6% over twelve months, and comfortably in the range that used to be reserved for crises. On 16 July 2026 the Bank of Korea raised its Base Rate 25bp to 2.75%, its first hike since January 2023. The won barely noticed.

The explanation is not complicated once you look at the right account.

Trade is only half the balance of payments

A country’s currency responds to all cross-border flows, not just goods.

The current account — mostly trade — brings dollars in. Korea’s is comfortably positive.

The financial account — investment flows in both directions — is where Korea’s dollars leave. And they leave in volume, through three channels:

1. Retail portfolio outflow. Korean households have accumulated very large holdings of US equities. Every won-to-dollar conversion to buy them is a won sale. This has become one of the most-discussed features of Korea’s modern balance of payments, and unlike a trade flow it does not reverse when export orders are strong — it is a persistent allocation decision by millions of households.
2. Corporate outward FDI. Korean manufacturers have been building capacity abroad — battery plants in the United States and Europe, chip fabs and assembly outside Korea, automotive plants near end markets. Sensible industrial strategy; sustained won selling.
3. Institutional allocation. Pension funds and insurers holding a rising share of assets overseas.

There is a fourth, more cyclical factor: exporters not repatriating. Korean firms earning dollars can choose to hold them offshore rather than convert. When they expect further won weakness, holding dollars is the rational choice — which weakens the won further. That reflexivity is why currency trends persist longer than fundamentals alone suggest.

Why the rate hike did so little

Textbook logic says a higher policy rate attracts capital and lifts the currency. In practice, a 25bp move to 2.75% did roughly nothing, for two reasons.

The differential is still adverse. What matters is the gap versus the dollar, not the level. A modest narrowing does not flip the carry calculation.

The outflows are not rate-sensitive. A household allocating retirement savings into US technology stocks is not comparing Korean deposit rates. A conglomerate building a plant in Georgia to sit inside a tariff wall is not either. Monetary policy moves the marginal speculative flow; it does not redirect a structural reallocation of national savings.

There is also a constraint most commentary skips. The Bank of Korea is simultaneously worried about household debt and property, which argues for tighter policy, and about growth, which argues for looser. Defending the currency is a third objective competing for the same instrument. It cannot get all three, and the currency is usually the one that gives.

Who wins and who loses

The distributional split is the reason there is no clean policy answer. A weaker won is a transfer from Korean consumers to Korean exporters, and both are constituencies.

September 2026: the structural change

The most consequential development is not a rate decision. New FX market infrastructure launches in September 2026, extending won trading accessibility for international participants.

To see why this matters, consider what the won has historically been. Offshore trading was restricted. Onshore hours were narrow. Non-resident access was limited. For a global institution, that meant awkward hedging, wider spreads, and settlement risk — real deterrents to holding Korean assets at scale, and a longstanding factor in Korea’s difficulties with developed-market index classification.

The reform is aimed squarely at that. Its logic is: make the currency easy to hold and hedge, and the assets become easier to own.

What we’re watching

The won is where three of Korea’s biggest stories collide. Its weakness was one of the reasons foreign investors sold a record ₩148.3tn of Korean equities in the first half of 2026 even as the index nearly doubled — the mechanics of which we covered in the 2026 crash explainer. It is also the reason a strong semiconductor export cycle has not translated into the currency strength you would naively expect from the HBM boom.

If September’s reform lowers the cost of holding Korean assets, one of the three reasons foreigners sold gets meaningfully weaker. That is the thing to watch this autumn.

Rates and figures current as of 12 August 2026 and sourced below. Nothing here is investment or currency advice — see the disclaimer.