Why Thailand stopped growing — and why it isn't really about politics

Thailand’s economy is forecast to grow 1.5% in 2026. The IMF’s number; the ADB says 1.8%, the World Bank has been between 1.3% and 1.8% depending on the month.

Vietnam will grow 7.1%. Indonesia 5%. Malaysia 4.7%. The Philippines 4.1%. Singapore, already rich, 3.5%.

Thailand will be the slowest-growing economy in ASEAN, and on current forecasts this is its weakest expansion in three decades once you exclude crisis years.

The standard explanation is politics — coups, instability, a decade of governments that didn’t last. It’s not wrong, exactly. It’s just much less important than two numbers that almost nobody in the expat conversation ever mentions.

Number one: 1.18

That’s Thailand’s total fertility rate in 2026. Births per woman.

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

At 1.18, each Thai generation is a little over half the size of the one before it. Not declining. Halving, roughly every two generations.

This is not a projection or a warning. It’s the current measured rate, and it has been falling for years.

The consequences are already arriving. Thailand’s median age is 40.1. In 2023 the over-60 population passed 20% — 13.2 million people — formally making Thailand an “aged society.” By 2040 that share is forecast to reach 31%.

And the working-age population, the part that actually generates output and pays tax, is going the other way: 64% in 2021, 61% in 2026, a forecast 56% by 2036.

An eight-point fall in fifteen years. Every point is people who aren’t there to work, spend, or pay income tax.

You cannot grow an economy at 5% while shrinking your workforce. Not with better policy, not with a stable government, not with a stimulus package. The arithmetic doesn’t permit it. This is the single largest fact about Thailand’s economy and it is almost entirely absent from English-language conversation about the country, which prefers to talk about coups.

Number two: 88.2%

Thai household debt as a share of GDP. Seventh highest in the world, and the highest of any developing economy.

Worse than the headline is the composition: more than 59% is non-productive debt — personal loans, credit cards, short-term high-interest borrowing. Not mortgages, not business lending, not investment in anything that generates a return.

That distinction matters enormously. A country where households borrow to buy property or start businesses is a country converting debt into assets. A country where households borrow at high interest to cover consumption is one where a large share of every future pay packet is already committed to a lender.

Which means the standard remedy for slow growth — stimulate domestic demand — doesn’t work here. You cannot spend your way out when the money is already spoken for. Thai households aren’t holding back from consuming; they’re servicing.

Put them together

A shrinking workforce and an indebted consumer base is a genuinely difficult combination. It squeezes from both ends at once.

Thailand can no longer compete on cost. Vietnam is cheaper, younger and growing at nearly five times the rate. Manufacturing that came here in the 1990s has a newer, hungrier option two countries north.

Nor can Thailand yet compete on value. Moving up the chain to high-productivity, high-wage work needs education, R&D and institutional capacity that take decades to build — and the demographic window to build them is closing.

This is the textbook middle-income trap: wealthy enough to have escaped poverty, not wealthy enough to have escaped competition. Thailand has been in the middle-income bracket for over thirty years, and has now watched Vietnam and the Philippines reach upper-middle-income status while it stayed put.

That’s the comparison that should sting. Not that Thailand is poor — it isn’t — but that countries which were considerably poorer within living memory are now passing it.

“Old before rich”

This is the phrase Thai economists use, and it’s precise rather than rhetorical.

Japan and Germany aged too. But they got wealthy first — they reached high-income status and built pension systems, healthcare funding and household savings, and only then did the population get old. Ageing was expensive but affordable.

Thailand is ageing at middle income, with 88% household debt and a thin pension system. As Kasikorn Bank’s chief economist put it: “We’ve become old before we’ve become rich.”

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

Why this shows up in your life

Here’s the part that matters if you live here, and where the abstractions become concrete.

A state facing a shrinking tax base looks for revenue. Which reframes several things you may have experienced as unrelated irritations.

The 2024 change to foreign income taxation — closing the rule that let residents remit foreign earnings tax-free after a year — is what a country does when it needs to widen its base. The ฿300 arrival fee for foreign visitors is the same instinct. So, arguably, is the enthusiasm for long-stay visa products aimed explicitly at wealthy foreigners: the LTR’s foreign-income exemptions and the Privilege tiers are, viewed coldly, an immigration policy designed to import taxpayers and consumers who arrive pre-aged and pre-funded.

Thailand is not being greedy. It is doing what demographics require. Expect more of it, not less.

And it explains the enthusiasm for you. Foreign residents who bring in income, buy healthcare, rent property and don’t draw a Thai pension are, from a fiscal perspective, close to ideal. That’s why long-stay visa products keep proliferating even as immigration enforcement elsewhere tightens.

You are, in policy terms, a demographic patch.

Common misconceptions

“It’s the political instability.” It’s a real drag on investment. But Vietnam is a one-party state and grows at 7.1%. Political stability is neither necessary nor sufficient — demographics are more fundamental.

“Tourism will fix it.” Tourism is roughly a fifth of the economy and is itself under pressure. It’s also low-productivity work, which is precisely the trap — it employs a lot of people at wages that don’t move the country up the income ladder.

“Thailand is poor.” It isn’t. It’s a solidly middle-income country with excellent infrastructure by regional standards. The problem is trajectory, not level.

“The government just needs to spend more.” With 88% household debt and 59% of it non-productive, stimulus lands on balance sheets already committed. Transmission is weak.

“Immigration could fix the demographics.” Arithmetically it could, and Thailand’s long-stay visa products are a cautious step in that direction. But the numbers required to offset a 1.18 fertility rate are politically enormous, and no ageing country has yet managed it at the necessary scale.

What happens next

The realistic path is a Japan-style adjustment: slow growth, an ageing society, high asset prices in desirable areas and weakness elsewhere, and steadily more of the budget going to healthcare and pensions.

That is not catastrophe. Japan is a pleasant, functional, wealthy country with a stagnant economy. But Japan reached that condition with high-income institutions and household savings. Thailand is arriving with middle-income institutions and household debt, which makes the same adjustment considerably harder.

The things that would genuinely change the trajectory are all slow: education reform, productivity, opening to skilled migration, and rebuilding household balance sheets. None deliver inside an electoral cycle, which is exactly why they keep not happening.

For anyone living here, the practical read: expect a soft economy, a state increasingly interested in taxing residents and visitors, and continued official enthusiasm for wealthy foreigners. All three follow from the same two numbers.

Final thoughts

The temptation with Thailand is to explain everything through politics, because politics is dramatic and demographics are not. Coups make headlines. A fertility rate falling from 1.4 to 1.18 makes nothing at all.

But 1.18 will still be shaping this country when every current politician has retired. It determines how many people work, how much they can be taxed, what the state can afford, and whether the young can support the old.

Thailand’s problem isn’t that it’s badly governed, though it has often been. It’s that it grew old before it finished getting rich, and is now trying to solve a fifty-year problem with instruments designed for four-year terms.

Which, if you’re an ageing society yourself — and if you’re reading this from Britain, Italy or Japan, you are — is worth watching closely. Thailand is simply further along the same road, without the cushion.