Seven major Chinese OEMs now operate in Thailand with a combined local capacity of more than 550,000 units per year — and that number is about to decide who wins the country's next policy cycle.

On September 10, 2026, Thailand's National EV Policy Committee agreed in principle to scrap its subsidy-first incentive model and replace it with a three-tier excise tax that ties rates directly to how much of a vehicle is built in Thailand. The plan still needs Cabinet approval, expected by the end of September.

The decision closes a nearly four-year experiment that worked almost too well. The EV 3.0 and EV 3.5 packages, launched in 2022, offered excise tax cuts from 8% down to 2%, subsidies as high as THB150,000 ($4,500) per vehicle, and generous import duty relief. In exchange, manufacturers made only a loose promise to eventually build locally what they imported.

Chinese OEMs moved fastest. BYD, Great Wall Motor, Chery, and Changan arrived with showroom-ready, competitively priced EVs years ahead of most rivals. BYD alone captured 40% of Thailand's EV market before its Rayong plant came online in mid-2024, on the strength of imported models alone.

Market share reshuffle

The influx hit a market that Japanese OEMs had anchored for three decades. Toyota and Honda built Thailand's auto industry around deep local supply chains and a commanding position in hybrid technology.

That dominance is now being tested. Between 2023 and the first seven months of 2026, Honda's share of Thailand's passenger car market fell 8 percentage points, from just over 20% to 12%. Toyota slipped from 32% to 28%, though it held the top spot. Over the same period, BYD grew from around 6% to 10%, and Jaecoo — which only entered the Thai market in August 2024 — reached nearly 6% by mid-2026, one of the fastest climbs the market has seen.

That reshuffling reflected more than model lineups. The EV 3.0 and EV 3.5 local production requirements were backloaded, allowing importers to capture subsidy benefits years before they built anything on Thai soil.

The powertrain battleground shifted too. Full hybrids, the segment Japanese brands dominate through mature local supply chains, led Thailand's electrified segment for most of the market's history. In early 2026, BEVs took the lead for the first time — a turning point Japanese OEMs could not simply watch unfold.

THB50.4 billion in Japanese commitments

Rather than compete purely on EV price, Japanese OEMs entered discussions with the government to find a solution that also supported Thailand's local supply chain. Those talks produced the September 10 agreement. Under the new structure, fully imported EVs face the steepest tax — above the old 10% baseline — while vehicles tied to local assembly or testing sit in the middle tier, and those built with genuine local content pay the lowest rate.

The timing is not incidental. Reports have linked the overhaul directly to Indonesia's attempt to lure Toyota production away from Thailand, turning the tax rewrite into a defense of the country's manufacturing base.

Japanese OEMs have responded with capital. Honda, Mitsubishi, Isuzu, and Mazda have collectively committed THB50.4 billion ($1.5 billion) to modernize their Thai assembly lines with automation and robotics, positioning plants to build hybrids, mild hybrids, and BEVs alike. Their decades-old supplier networks are precisely what the new tax tiers reward.

Hybrids still in the game

Hybrids have not lost relevance just because BEVs pulled ahead. Chinese OEMs are hedging accordingly: MG and GWM now sell hybrid variants alongside their EVs, BYD has added plug-in hybrids, and Changan has brought its extended-range EV technology to market. Thailand's electrification shift was never going to be a BEV-only story.

Whether the tax tiers play out as written is the key question shaping the next chapter. On paper, the structure favors companies with deep local roots — which points toward Japanese manufacturers and their established supplier networks. But Chinese OEMs are no longer just importers. BYD, GWM, and Changan now operate factories on Thai soil, and the newest of those plants could plausibly meet the local-content thresholds the policy rewards.

The more revealing test may not be a contest between two national industries, but whether Thailand's own supply base — caught between both camps — can scale and adapt quickly enough to matter to either side.

What to watch next: the Cabinet decision on the three-tier excise structure expected by the end of September, and the local-content thresholds that will determine whether the newest Chinese plants or the oldest Japanese networks capture the lowest tax rate.