The 'so what'

For three years, Chinese EV makers used Thailand and Indonesia as a duty-free bridgehead into Southeast Asia: ship finished cars in, pay little or no tariff, promise to build factories later. That bridge is now being dismantled on schedule. Indonesia ended its completely-built-up import tax break on December 31, 2025, and Thailand's incentive scheme now requires two locally assembled EVs for every one imported in 2026, rising to three-to-one in 2027 1 6. The policies were written years ago, but 2026 is when they start to bite — and the results are already dividing the region's Chinese entrants into two camps: those with real factories running, and those with neither the cash nor the cars to keep up.

The window closes on schedule

Thailand's Board of Investment revised its EV3.5 package this year, confirming the production-offset ratio steps to 2:1 in 2026 and 3:1 in 2027, while also letting each exported BEV count as 1.5 units toward a manufacturer's local-production obligation — a concession clearly aimed at helping compliant automakers use export volume to hit their targets 1 2. Investment in Thailand's EV supply chain has already topped 137 billion baht under the scheme, spanning batteries, assembly and components 2. In Indonesia, the rules are blunter: any manufacturer that took advantage of 2024–2025 duty exemptions on imported EVs must now produce domestically in the same volume it previously imported, and Jakarta requires completely-knocked-down local content to gradually exceed 40 percent 6.

Neither government designed this as a surprise. Both told automakers years in advance that duty-free importing was a bridge, not a destination. What is new in 2026 is that the bridge has actually been retracted, and balance sheets are now the thing being tested rather than production plans on paper.

BYD cleared the bar early

BYD is the clearest evidence the mandate can be met profitably. Its Rayong, Thailand plant, with roughly 150,000 units of annual capacity, has been operating and supplying both the domestic Thai market and regional exports 7. In Indonesia, BYD's roughly $1 billion Subang, West Java facility — also rated near 150,000 units a year — was on track to start production in 2026, with the company indicating a localization rate of 50 to 60 percent that management says cuts total vehicle cost by more than 30 percent 7. That is the arithmetic regulators were hoping for: local content high enough to blunt the loss of duty-free importing, at a cost structure that still lets a Chinese brand undercut legacy Japanese and Korean models on price.

Neta's bill comes due

Neta is the counter-example. Its parent, Hozon New Energy Automobile, entered court-supervised bankruptcy reorganization in China on June 12, 2025, with creditor claims later disclosed above $700 million and the case run by the Intermediate People's Court of Jiaxing 3 4. The restructuring effort has drawn dozens of prospective investors, but as of late 2025 no buyer had closed a deal, and the brand has had to fight simply to keep its Chinese manufacturing licenses active by hitting minimum production thresholds 4.

That distress has followed Neta into Thailand. Its dealer network there shrank from 66 outlets in March 2024 to 53 by May 2025, and Thailand's Excise Department — the agency that enforces the BOI's import-to-production ratio — has singled the brand out for closer monitoring, asking Neta Thailand to post an additional 50 million baht (roughly $1.4 million) in bank guarantees to backstop its compliance 5. Regulators are also weighing a mechanism to let financially strained manufacturers defer the compensatory duty payments owed if they miss their production ratio, an accommodation clearly written with a brand like Neta in mind 5. Miss the ratio without that relief, and the automaker owes back the full tariff difference on every unit it imported duty-free.

Why the ratio math matters for investors

The policy design converts what looked like a marketing race — which Chinese brand can undercut the others on price — into a capital-discipline test. Standing up 100,000-plus units of annual local capacity requires sustained capex and working capital that a company mid-bankruptcy simply cannot commit, no matter how competitive its cars are on a showroom floor. That means market share in Thailand and Indonesia is now being allocated less by product and more by balance-sheet survival: BYD, Wuling and other well-capitalized entrants can absorb the localization cost and keep pricing aggressively, while thinly financed brands face a choice between paying back duties, exiting, or being acquired.

The regional read-through

The pattern extends beyond autos. Vietnam, India and the Philippines are all moving from blanket import incentives toward conditional, production-linked ones, and the ASEAN EV mandates are an early, concrete test case of how that shift plays out when it actually reaches its deadline. For investors, the signal is to watch 2027, when Thailand's ratio tightens again to three-to-one: that is likely to force a second, sharper round of the same sorting — rewarding automakers with real Southeast Asian factories and squeezing whichever brands are still relying on financial engineering rather than production capacity to stay in the market.