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Mahidol University’s Institute for Population and Social Research put Thailand’s total fertility rate at 1.0 in its 2025 Population Gazette, and at 0.86 in the 2026 one.

Replacement — the rate at which a population holds steady — is about 2.1.

In 2024 Thai births fell below 500,000 for the first time. In 2025 they fell again, to 416,574 — the fewest in seventy-five years — against 559,684 deaths, the fifth consecutive year in which more people died than were born. Those are registration counts from the Interior Ministry, not estimates.

Now a caution that this article is going to observe throughout, because the previous version did not.

There is no single Thai fertility number, and the figures in circulation are not competing claims about one quantity — they are different methods. Mahidol’s figures are estimates, built from the Multiple Indicator Cluster Survey, the census, the NESDC’s projections and registration data, and the Institute itself says its Gazette values from different years must not be read as a trend. United Nations World Population Prospects reconstructions, which is what most international databases republish, put 2025 nearer 1.4. Article 129 Have parents when you’re ready of this collection uses the 0.86.

Those are not attempts at the same sum. A survey-and-registration estimate and a model-based reconstruction answer different questions and are not interchangeable. This article uses Mahidol’s estimate and says so every time it appears.

What is not in dispute, on any method, is the direction and the distance from replacement. 416,574 births is a count, not a model.

First, the growth figures, dated

Thailand is forecast to grow between 1.8% and 1.9% in 2026.

The IMF revised its 2026 forecast up by 0.4 points to 1.9% in July 2026, and raised 2027 by 0.1 points to 2.2%. The ADB has 1.8% for 2026 and 2.0% for 2027. An earlier IMF projection, from November 2025, had 1.6%.

Vietnam, on the same July revision, was raised by 0.4 points to 7.5%.

Two things follow, and the second is the one the earlier version of this article got wrong.

Thailand’s growth is slow — roughly a quarter of Vietnam’s — and that is not in dispute. But the forecasts have been revised upward, not downward, and any version of this story built on a single low number was building on a moving figure chosen at its floor.

And Thailand cannot simply be called the slowest in ASEAN. On ADB figures it is not uniquely lowest.

Politics is part of it

The original version of this article argued that Thailand’s slow growth “isn’t really about politics.” That was too strong, and the IMF says so directly.

Its 2025 Article IV assessment identifies external headwinds, constrained credit, tourism weakness and domestic political uncertainty among the current drags on the economy.

Political uncertainty is on that list, from the institution most often cited in support of the structural argument.

What can be said, and is worth saying, is narrower. Politics operates on a different timescale from demography. A government can change the investment climate within a term. Nothing a government does within a term changes how many people were born five years ago.

Both are real. They are not competing explanations, and treating them as rivals was the original article’s basic error.

What 1.0 actually does

At 1.0 births per woman, each generation is roughly half the size of the one before it.

Thailand’s median age is around 40. At the end of 2025 the over-60 population was 14.1 million people — 21.8% of the country, on the Department of Older Persons’ count, having passed the 20% line that formally makes Thailand an aged society in 2023. The NESDC’s projection has that share at 31% — 20.4 million people — by 2040. (Those figures are for 60 and over, not 65 and over.)

The working-age share is moving the other way. On the same NESDC projection, people aged 15 to 59 fall from 43.3 million, 65% of the population, in 2020 to 36.5 million, 56%, in 2040. An earlier version of this article gave a current figure of “around 61%”; it was an interpolation between two published points, not a published figure, and it has been removed.

And here is where the original article overreached, so this version will be careful.

It is not true that an economy cannot grow while its workforce shrinks. Output is workers multiplied by output per worker. If productivity rises faster than the workforce falls, output grows. Japan’s output per worker has risen through decades of demographic decline. Labour-force participation can rise — particularly among women and older workers. Migration can offset it directly.

What is true is narrower and still serious. Every one of those offsets is hard, slow, and currently insufficient in Thailand. Raising productivity needs education, capital and institutions built over decades. Participation is already comparatively high. Migration at the scale required to offset a fertility rate near 1 has not been achieved by any ageing country.

So the honest statement is not “you cannot grow.” It is that Thailand needs unusually strong productivity growth to grow at all, and has not been producing it.

Household debt, and the trend that was missed

Thai household debt stood at 85.9% of GDP in Q1 2026.

It has fallen from a peak of 91.3% and ฿16.39 trillion in Q4 2023, through 87.4% in Q1 2025 and 86.8% in Q2 2025, to 85.9% and ฿16.41 trillion in Q1 2026 — the lowest ratio in six years, on the NESDC’s own description in its report of 24 August 2026. The stock of debt grew 0.5% in a year; the economy grew faster.

The earlier version of this article quoted 88.2%, undated, and presented it as a fixed weight. It is not fixed. It is falling.

85.9% is still very high — among the highest in the developing world, and high enough to constrain consumption materially. But a ratio that has fallen for two years is a different economic story from a ratio stuck at its peak, and the original told the wrong one.

On composition, the same caution applies. It is well established that much Thai household debt is non-productive — personal loans and credit cards rather than mortgages or business lending — and that this matters, because debt converted into assets and debt converted into consumption have very different consequences.

The original stated “more than 59% is non-productive”, which reads as a share of value. The figure in circulation appears to describe the share of debt ACCOUNTS in a 2023 breakdown, which is not the same thing. This version therefore states the direction and not the percentage.

And the policy conclusion needs the same correction as the demographic one. It is not true that stimulus cannot work. High household debt weakens the transmission of demand stimulus, because a larger share of any additional income services existing obligations. Weakened transmission is not zero transmission, and the original’s “you cannot spend your way out” was an absolute the evidence does not support.

Old before rich

This part survives the rewrite intact, because it is the strongest thing in the original.

Japan and Germany aged too — but they reached high income first, and built pension systems, healthcare funding and household savings before the population got old. Ageing was expensive and affordable.

Thailand is ageing at middle income, with household debt near 86% of GDP and a thin pension system.

The bill arrives as a state with rising obligations to an ageing population, funded by a shrinking working-age tax base, in a country that has not finished getting rich.

And it connects to something this publication has now found repeatedly. Article 92 The first toll established that a universal provision must also be adequate, and article 173 It arrived, and it was not enough showed the shape with figures: ฿181bn of universal healthcare capitation disbursed, and nearly a thousand hospitals still in deficit. That is what an ageing society at middle income looks like at the point of delivery — not an entitlement withdrawn, but an entitlement funded below its cost.

Why this shows up in your life

⚠️ This section is interpretation, and is labelled as such. The policies are facts; the demographic motive attributed to them is this site’s reading.

A state facing a shrinking tax base looks for revenue, and several things residents experience separately are consistent with that.

The 2024 change to foreign income taxation — closing the rule that allowed residents to remit foreign earnings tax-free after a year — is a fact, and is what a country does when it needs to widen its base.

The arrival fee is not yet a fact, and the earlier version of this article was wrong to state it as one. The proposal has changed: from ฿300 on air arrivals and ฿150 by land or sea, to ฿450 a head, charged on air arrivals from the day it takes effect and on land and sea crossings a year later. An earlier version of this paragraph called it a flat ฿450 however a visitor enters; that was corrected on 27 September 2026 from the draft’s public consultation. The National Tourism Policy Committee reviewed it on 14 August 2026 and announced it on 17 August 2026 as a proposal. Its public consultation was set to close on 28 September 2026; it then needs Cabinet approval, and early 2027 is the ministry’s stated aim. A single payment would cover multiple entries within 30 days, with part funding accident and emergency medical insurance for visitors.

Long-stay visa products aimed at wealthy foreigners — the LTR’s foreign-income exemptions, the Privilege tiers — are also facts. Reading them as an immigration policy designed to import taxpayers who arrive pre-aged and pre-funded is an interpretation, and a defensible one, but it is not something any official document says.

On that reading, foreign residents who bring in income, buy healthcare, rent property and draw no Thai pension are close to fiscally ideal. Expect more of these products rather than fewer.

Common misconceptions

“It’s the political instability.” It is a real drag and the IMF lists it. It is also not the whole story, and it operates on a shorter timescale than demography.

“Thailand will grow 1.5% this year.” Current forecasts are 1.8–1.9%, revised upward in July 2026.

“Thailand’s fertility rate is 1.18.” No source was given for it. Mahidol’s registration-based figure for 2024 is 1.0; UN reconstructions for 2025 are nearer 1.4. The figure is method-dependent and must always be attributed.

“You can’t grow with a shrinking workforce.” You can, if productivity rises faster than the workforce falls. The difficulty is that it has to, and in Thailand it has not been.

“Household debt is stuck at 88%.” It has fallen since the end of 2023, to 85.9% in Q1 2026.

“There’s a ฿300 fee to enter Thailand.” There is not. A ฿450 fee is proposed and in consultation.

“Stimulus can’t work here.” High debt weakens transmission. It does not eliminate it.