Vietnam Forecast to Become Southeast Asia's Second Largest Economy by PPP in 2026–2031

Vietnam Approaches a $2 Trillion Economic Milestone

Vietnam's economy is projected to reach $2.025 trillion in purchasing power parity terms in 2026, putting it on course to become Southeast Asia's second largest economy during 2026–2031, according to the International Monetary Fund. Indonesia would remain the regional leader, with a projected $5.230 trillion economy in 2026.

The outlook, as of April 23, 2026, places Vietnam ahead of Thailand, Malaysia, the Philippines and Singapore on this measure. Vietnam and Indonesia would be the only two economies in the Association of Southeast Asian Nations (ASEAN) to exceed $2 trillion in purchasing power terms.

Thailand's position as the region's longstanding economic runner up is central to the change. In 2006, its economy was more than three times the size of Vietnam's when measured in dollars at prevailing exchange rates. By 2024, the difference had narrowed sharply. The IMF projection now points to Vietnam moving ahead when national output is adjusted for differences in prices.

Vietnam's rise reflects decades of sustained growth that have transformed an economy damaged by war into a major manufacturing and export centre. Its expanding factories, foreign investment and domestic market have increased its economic weight within ASEAN.

The forecast concerns the total size of the economy. Living standards depend on how that output compares with the number of people sharing it, and Thailand still has higher output per person. Understanding both measures explains how Vietnam can become the larger economy while its citizens remain less prosperous on average.

What Purchasing Power Parity Measures

Purchasing power parity, usually shortened to PPP, adjusts economic figures for differences in the prices of goods and services between countries. It asks how much money people need in different places to buy the same basket of products.

Nominal gross domestic product (GDP) measures a country's output and converts its value into dollars using current exchange rates. PPP uses price comparisons to estimate the volume of goods and services that the economy produces. The methodology is developed through the World Bank's International Comparison Program.

A dollar stretches further in Hanoi than in Hong Kong because many everyday purchases cost less. Local services and goods that are not traded internationally can be especially inexpensive in developing economies. PPP accounts for those differences, giving a fuller picture of domestic purchasing capacity than a conversion based only on exchange rates.

Dr. Nguyen Anh Vu, head of the finance faculty at Ho Chi Minh City University of Banking, explains that this approach provides a more accurate picture of domestic economic scale. For a country such as Vietnam, lower living costs mean that the amount people can buy at home is greater than nominal dollar figures suggest.

Nominal GDP remains relevant to a country's capacity to pay for imports or service foreign debt. Those payments depend on money that can be exchanged internationally. PPP is more useful for comparing the actual volume of production and the purchasing power available within national economies.

Vietnam's projected crossing of the $2 trillion PPP threshold therefore points to a substantial domestic market and a large production base. Its economy can rival countries with much larger nominal dollar figures once local prices are taken into account.

How the Regional Ranking Could Change

The IMF outlook covers six major Southeast Asian economies: Indonesia, Malaysia, the Philippines, Singapore, Thailand and Vietnam. By 2031, it projects Indonesia remaining firmly in first place, with Vietnam establishing itself in second.

Vietnam's lead over Thailand is expected to exceed $500 billion in PPP terms by 2031. Its distance from Malaysia and the Philippines would also increase, while Singapore would fall further behind in total economic scale despite remaining the leader in income per person.

Indonesia's projected $5.230 trillion economy in 2026 would still be much larger than Vietnam's $2.025 trillion economy. Vietnam's figure is about 39 percent of Indonesia's. Across the projection period, Vietnam's relative size is expected to rise to 46 percent of Indonesia's, narrowing the proportional gap while Indonesia retains the top position.

Singapore illustrates why a ranking of total output differs from a ranking of prosperity. The city state's advanced economy generates high income per person, but its small population limits total production compared with Vietnam's population of more than 100 million.

Vietnam's momentum also reflects different growth patterns within the region. Manufacturing moving from China, strong foreign direct investment and a young population have supported its expansion. Some neighbouring economies have experienced periods of stagnation or political instability, while Vietnam has maintained relatively steady growth.

Two Decades of Catching Up with Thailand

Thailand's nominal GDP exceeded $220 billion in 2006, compared with Vietnam's $66 billion. That difference reflected Thailand's earlier industrial development, established manufacturing base and tourism infrastructure.

By 2024, Thailand's nominal GDP was nearly $530 billion and Vietnam's nearly $480 billion. Using those approximate figures, Vietnam had grown from around 30 percent of Thailand's size in 2006 to roughly 91 percent in 2024.

The PPP figures for 2024 also show how close the two economies had become. Thailand stood at $1.770 trillion, compared with Vietnam's $1.650 trillion. The projected move ahead would complete a substantial change in their relative positions over two decades.

Dr. Nguyen Anh Vu, head of the finance faculty at Ho Chi Minh City University of Banking, connects the forecast to Vietnam's stronger growth over an extended period:

The IMF's projection that Vietnam will surpass Thailand to become Southeast Asia's second-largest economy by PPP in the 2026-31 period is reasonable. Historically, Thailand's economy was far larger than Vietnam's, but the gap has narrowed significantly as Vietnam has maintained stronger growth over a prolonged period.

The main dates show the progression from a wide economic gap to a projected change in the regional ranking:

• 2006: Thailand's nominal GDP exceeded $220 billion, while Vietnam's was $66 billion.
• 2024: Thailand reached nearly $530 billion in nominal GDP and $1.770 trillion in PPP terms. Vietnam reached nearly $480 billion and $1.650 trillion respectively.
• 2026: Vietnam's PPP GDP is projected at $2.025 trillion, compared with Indonesia's $5.230 trillion.
• 2026–2031: Vietnam is forecast to become Southeast Asia's second largest economy by PPP.
• 2031: Vietnam's projected PPP lead over Thailand exceeds $500 billion.

Why Thailand Still Has Higher Output per Person

Thailand's nominal GDP per person was nearly $7,350 in 2024, compared with Vietnam's $4,720. After adjusting for purchasing power, the figures were $24,710 for Thailand and $16,385 for Vietnam.

Vietnam's nominal output per person was therefore about 64 percent of Thailand's, using the stated figures. Its PPP output per person was about 66 percent. Both comparisons show a substantial gap even as the countries approach one another in total economic size.

Vietnam has more than 100 million residents, against Thailand's roughly 70 million. A larger population can help generate a larger economy, but that output must also support more people. GDP per capita divides national output by the population, providing an average rather than a measure of each person's actual income.

Dr. Vu uses a household comparison to explain why population matters when considering living standards:

This is like two families with the same income but different numbers of members. The smaller family would enjoy a higher standard of living.

Vietnam's next development task is to turn its growing economic scale into better living standards for its larger population. That requires attention to the quality and productivity of economic activity as well as the amount of output produced.

Factories and Foreign Investment Drive Expansion

Vietnam has become a major beneficiary of the China plus one strategy, under which multinational manufacturers keep operations in China while adding production elsewhere. The approach spreads their supply chains across more than one country.

Samsung, Apple suppliers and numerous electronics manufacturers have established substantial operations in Vietnamese industrial parks. Their factories bring investment, technology and export revenue, helping explain the country's emergence as a manufacturing centre.

Foreign direct investment has also flowed into real estate and infrastructure. Vietnam has maintained relatively stable inflows compared with regional peers that have experienced greater investment volatility.

Trade agreements supporting Vietnam's international integration include the Comprehensive and Progressive Agreement for Trans-Pacific Partnership and the Regional Comprehensive Economic Partnership. Preferential access to major markets, including Japan, Canada, Australia and the European Union, supports the country's appeal as a production base.

Manufacturing investment and access to overseas markets reinforce one another. Factories create goods for export, while trade connections help producers reach customers abroad. Vietnam's sustained expansion has depended on both its ability to attract production and its place in international supply chains.

A Young Population and Better Connections

Vietnam's population remains young relative to those of Thailand and Singapore, where ageing is more advanced. An expanding workforce can support production and consumption, creating what economists call a demographic dividend: an opportunity for growth when a large share of the population is working.

Ho Chi Minh City and Hanoi are also growing as major metropolitan centres. Rapid urbanisation brings businesses, workers and consumers closer together, concentrating economic activity and enlarging urban markets.

Government investment in highways, ports and digital infrastructure has reduced logistics costs and improved connections. For manufacturers, logistics includes moving materials into factories and finished goods to buyers. Better transport links can make those journeys cheaper and more reliable.

Bureaucratic inefficiencies and corruption remain persistent concerns. Vietnam's growth therefore combines expanding physical infrastructure and a favourable workforce profile with continuing difficulties in administration and governance.

Turning Economic Size into Higher Living Standards

Vietnam's projected second place in PPP terms confirms its emergence as a major centre of production and consumption. Its lower output per person compared with Thailand, Singapore and Malaysia also shows how much work remains in raising average living standards.

The middle income trap is one challenge described in the country's development outlook. It refers to an economy reaching a moderate income level and then struggling to advance further because its earlier sources of growth become less effective.

Vietnam's transition requires moving beyond assembly based on low labour costs toward manufacturing with greater value, more advanced services and innovation. Producing more sophisticated goods and services can increase the value generated by each worker.

Education quality, spending on research and development, and institutional transparency will help determine how far that transition goes. They are central to whether Vietnam follows a route toward advanced economy status, as South Korea did, or stalls at its current development level.

The IMF figures are projections through 2031. No narrower date is given for Vietnam's move into second place within the 2026–2031 period. The forecast describes an expected trajectory, with continued growth and improvements in productivity central to achieving it.

A Larger Economic Role within ASEAN

Vietnam's growing economic footprint could give it greater diplomatic weight within ASEAN. A larger economy can support larger military budgets and make the country more attractive as a partner to major powers, including the United States, China and Japan.

The projected ranking also points to a change in the distribution of economic influence within Southeast Asia. Indonesia would remain the dominant economy, while Vietnam's position would become stronger relative to Thailand and the other major economies covered by the outlook.

Vietnam is likely to remain careful about avoiding friction with China, its much larger northern neighbour, and preserving the balance of cooperation within Southeast Asia. Greater economic weight would sit alongside those existing diplomatic considerations.

The central development is the combination of rising national output and an unfinished task at household level. Vietnam is approaching a major regional milestone, while its larger population means that matching Thailand's average prosperity requires more than overtaking its total GDP.

The Bottom Line

• The IMF projects Vietnam becoming Southeast Asia's second largest economy by PPP during 2026–2031, ahead of Thailand, Malaysia, the Philippines and Singapore.
• Vietnam's PPP GDP is forecast at $2.025 trillion in 2026, compared with Indonesia's $5.230 trillion.
• Vietnam's projected lead over Thailand exceeds $500 billion by 2031.
• Vietnam's economy is expected to rise from about 39 percent to 46 percent of Indonesia's size in PPP terms across the projection period.
• Thailand retains higher output per person: nearly $7,350 nominal and $24,710 PPP in 2024, compared with Vietnam's $4,720 and $16,385.
• PPP adjusts for local prices, while nominal GDP uses prevailing exchange rates.
• Manufacturing, foreign investment, trade access, a young workforce and infrastructure investment support Vietnam's expansion.
• Higher productivity, education, research and transparent institutions are central to translating economic growth into better living standards.