Vietnam's $20.46 billion trade deficit in the first eight months has not translated into a corresponding rise in the USD/VND exchange rate. Disbursed foreign direct investment (FDI), along with other foreign currency inflows, is helping balance dollar supply and demand, but questions remain over the quality of these capital flows and their ability to generate net foreign currency for the economy.
Large trade deficit, but FDI creates a "matching source of dollars"
Vietnam recorded a trade deficit of $20.46 billion in the first eight months of 2026, with imports reaching $395.3 billion, up 35.3%, while exports rose 22.4% to $374.84 billion. In August alone, the trade deficit was just $120 million.
What is notable is that the exchange rate has not moved in the same direction as the trade deficit. According to the National Statistics Office, the U.S. dollar price index rose 1.31% year-on-year on average in the first eight months. In August alone, it fell 0.36% from a year earlier and 0.38% from December 2025.
Meanwhile, according to brokerage MBS, the interbank USD/VND exchange rate stood at 26,083 dong per dollar at the end of August, down 0.8% from the end of July and 0.7% from the start of the year.
Why has the large trade deficit not put corresponding pressure on the exchange rate?
Rong Viet Securities (VDSC) said import and export data do not fully reflect developments in the foreign exchange market. The value of goods crossing borders does not necessarily mean foreign currency payments arise immediately at the same time. Assessing exchange-rate pressure requires looking at actual foreign currency supply and demand.
Dr. Can Van Luc also said the trade deficit has some impact on the foreign currency balance and exchange rate, but not a significant one. He said the foreign currency balance is also supported by the VND-USD interest rate differential, disbursed FDI, remittances and international tourism. These flows help offset foreign currency demand generated by imports, allowing the USD/VND exchange rate to remain within a controlled range.
From this perspective, FDI has become one of the notable sources of foreign currency supply.
In the first eight months, total registered FDI reached $40.63 billion, up 55.4% year-on-year. Disbursed FDI stood at $17.25 billion, up 12% and the highest level for the first eight months in five years.
Notably, the FDI sector still posted a trade surplus of $10.14 billion, while the domestic economic sector recorded a deficit of as much as $30.6 billion. The FDI sector also accounted for 80.1% of total exports, at $300.37 billion.
Thus, in terms of the trade balance, the FDI sector is generating a significant amount of foreign currency through exports, helping offset the economy's foreign currency demand.
But this is only one side of the flow.
In the first eight months, the FDI sector also imported $290.23 billion worth of goods, up 40.1%. The sector is therefore both generating foreign currency revenue from exports and creating substantial dollar demand for imported machinery, components, raw materials and production inputs.
The key issue, therefore, is not just how much FDI flows into Vietnam, but how much net foreign currency this capital generates for the economy.
The FDI sector's $10.14 billion trade surplus has some significance for the foreign currency balance. Meanwhile, 94.1% of the country's imports were production inputs, indicating that most current dollar demand is linked to production, investment and the expansion of economic capacity.
Are FDI dollar inflows sustainable enough to support the dong?
If FDI is one of the important sources of foreign currency supply, the next question is whether these flows are large and stable enough to provide a "buffer" for the exchange rate in the final months of the year.
In reality, FDI is not the only source of foreign currency supporting the market.
Speaking to the media recently, expert Dao Hong Chau said companies increasing their foreign borrowing and selling dollars for dong could increase the supply of foreign currency sold into the market, thereby helping lower the dollar's value.
He said exchange-rate stability also has a positive impact on the ability to attract and retain foreign capital as investors become less concerned about the risk of dong depreciation.
Expert Nguyen The Minh said foreign currency supply is being supported by foreign currency credit, foreign borrowing by companies and banks, and disbursed FDI. A stable exchange rate, he said, helps ease pressure on inflation, macroeconomic balances and foreign currency-denominated debt obligations.
Thus, current exchange-rate movements do not depend solely on the trade balance but are also affected by various foreign currency flows. This is why a widening trade deficit does not necessarily translate into a corresponding rise in the dollar.
However, this should not be viewed as a condition that can automatically persist.
Eight-month data show imports by the FDI sector rose 40.1%, faster than the 26.9% growth in its exports. On the one hand, this reflects expanding production and investment activity; on the other, it shows that foreign currency demand for imported inputs remains substantial.
As disbursed FDI continues to rise and the FDI sector maintains a trade surplus, foreign currency inflows from the sector have a stronger basis for supporting the foreign currency balance. However, the extent of that support will also depend on import trends and other foreign currency flows.
VDSC also noted that exchange-rate pressure only emerges when foreign currency flows actually arise in the market. Therefore, looking only at the headline trade deficit to assess exchange-rate pressure could give an incomplete picture.
At present, foreign currency supply from disbursed FDI, foreign borrowing and other capital flows is creating a buffer for the foreign exchange market. At the same time, movements in the global dollar are also helping ease pressure on the USD/VND exchange rate.
Still, this "buffer" will only be sustainable if FDI continues to translate into production capacity, exports and value added in Vietnam.
In other words, exchange-rate pressure is not determined simply by how large Vietnam's trade deficit is, but, more importantly, by what sources of foreign currency the economy has to offset that deficit and whether those sources are sustainable.
For FDI, the current signals are relatively positive, with capital disbursement at its highest level in five years and the sector still posting a trade surplus of more than $10 billion. But the 40.1% increase in FDI-sector imports also shows that these dollar flows are moving in both directions.
FDI is therefore helping support the exchange rate, but for it to become a long-term anchor, what matters more is the ability to turn foreign capital inflows into a source of net foreign currency generation for Vietnam.