Southeast Asian Economic Outlook Deteriorates Across the Board

Economic growth forecasts for Southeast Asia are being downgraded across the region amid escalating Middle East tensions and concerns over the Strait of Hormuz blockade. Maybank Research has lowered its 2026 GDP growth forecast for ASEAN-6 (Indonesia, Malaysia, Philippines, Singapore, Thailand, and Vietnam) from 4.8% to 4.5%, a reduction of 0.3 percentage points.

The countries expected to suffer the most severe impact are the Philippines and Vietnam. Both nations saw their growth forecasts cut by 0.4 percentage points each, while Thailand's outlook was lowered by 0.3 percentage points. Singapore's 2026 growth forecast stands at 3.4%.

Stagflation Concerns Triggered by Soaring Oil Prices

Capital Economics analyzes that oil prices exceeding $100 per barrel are delivering a double blow to regional economies. High oil prices increase inflationary pressure while simultaneously expanding fiscal deficits, limiting governments' capacity for economic stimulus.

The Philippines in particular has seen Capital Economics slash its 2026 growth forecast from 4.5% to 3.8%, a significant downward revision of 0.7 percentage points—the largest adjustment in the region. The Philippines has a structure particularly vulnerable to oil price increases due to its heavy dependence on petroleum imports.

Nomura has warned of a regional "stagflation shock," raising the possibility of simultaneous price increases and growth slowdown. Fitch Ratings has also pointed out that India and the Philippines face the greatest risks.

Complex Crisis Created by Hormuz Strait Blockade

The direct cause of these downward revisions is the prolonged U.S.-Israel war with Iran and the effective blockade of the Strait of Hormuz. Disruptions to this strait, through which approximately 20% of global oil shipments pass, have immediate impacts on the global supply chain.

Southeast Asia has many manufacturing-based economies, meaning rising energy prices directly translate into increased production costs. This is compounded by economic slowdowns in major export markets China and the United States, further darkening export prospects.

Maybank Research has also slightly lowered its 2027 forecast from 4.8% to 4.7%. This reflects expectations that the energy crisis will not be resolved in the short term.

Impact on South Korea [AI Analysis]

The Southeast Asian economic slowdown is likely to deliver a direct blow to Korean exports. ASEAN is South Korea's second-largest export destination, accounting for approximately 16% of total exports as of 2024.

Korean flagship export products such as semiconductors, displays, and automobiles are particularly dependent on intermediate goods demand from Southeast Asian manufacturers. Analysis suggests that a 0.3 percentage point decline in regional growth could reduce Korean exports to ASEAN by 1-2%.

A bigger concern is that global supply chain restructuring may be delayed. Korean companies have been relocating production bases to Vietnam, Thailand and other countries to diversify China risks, but growing economic uncertainty in these nations is expected to affect investment decisions.

Rising oil prices also create inflationary pressure for South Korea. With oil import dependence exceeding 95%, a $10 per barrel increase is estimated to worsen the trade balance by approximately $5 billion. Like Southeast Asia, the possibility of exposure to stagflation risks cannot be ruled out.