Thailand Rewrites Its Auto Tax Code as Japanese Carmakers Push Back

When Prime Minister Anutin Charnvirakul stood before reporters in Wellington on August 21 and insisted that no Japanese manufacturer was pulling out of Thailand, he also confirmed something his government would rather not emphasize: he had ordered a review of whether the country's tax structure still treats established automakers fairly. The task went to Deputy Prime Minister and Finance Minister Ekniti Nitithanprapas, and few governments commission urgent reviews of industries that are thriving.

The friction traces back to Thailand's electric vehicle incentive schemes, EV 3.0 and EV 3.5. Under those packages, companies could import battery-powered cars at a reduced 2% excise rate rather than the standard 8%, with import duties capped and buyer subsidies reaching 150,000 baht per vehicle. In exchange, each importer owed Thailand domestic production: under EV 3.5, one car built locally for every two shipped in by 2026, rising to one-for-three in 2027 if the initial deadline slipped.

That obligation functions like a debt payable in vehicles. Firms that sold imported models heavily in 2023 and 2024 must now keep Thai assembly lines running regardless of demand, since failing means refunding subsidies plus the excise difference plus penalties. The result, critics say, is engineered oversupply and steep showroom discounts. The system's fragility became clear when Chinese-backed Neta entered bankruptcy proceedings, leaving its Thai unit owing roughly 24,000 offset vehicles against only about 4,700 built despite collecting more than 2 billion baht in support. Regulators responded with monthly production forecasts, withheld payments and bank guarantees, but dealers were already chasing unpaid invoices.

The damage is visible across the industry. Subaru's contract assembler halted Thai output at the close of 2024, and Suzuki will shut its Pluak Daeng factory by the end of 2025, a plant born from the 2007 Eco Car program. Honda stopped vehicle assembly at its 1996-era Ayutthaya site and folded production into Prachinburi. Combined national capacity of 270,000 units has sat idle against actual output below 150,000 for four consecutive years. There is historical irony, too: when General Motors withdrew in 2020, China's Great Wall Motor bought its Rayong plant, meaning incentive schemes have now twice delivered industrial capacity into Chinese ownership.

What is unfolding now is less an exodus than a coordinated lobbying push. At the Thai launch of the Super-ONE EV, Honda Automobile Thailand chief Koji Iwanami argued that fully built imports from Japan, Europe and the United States face duties of up to 80%, while battery and range-extender EVs from certain free-trade partners enter duty-free. Honda wants something closer to parity so it can bring in models such as the Freed and Jazz, which it cannot build locally because Prachinburi is nearing its 110,000-unit limit.

Honda's second demand concerns hybrids. As Thailand tightens local-content thresholds required to retain preferential excise rates, the company says four hybrid models cannot realistically be re-engineered mid-cycle, exposing them to excise climbing from 6% to 8% and then 10% in a market where household debt has suppressed loan approvals for three years. Six Japanese brands are working through an eight-point agenda at the Japanese Chamber of Commerce in Bangkok. Toyota, meanwhile, has complained that imported EVs enjoy lighter effective taxation than Thai-built cars while publicly ruling out any departure, a statement it needed after Indonesia's finance minister openly invited it to relocate regional production to Jakarta on August 4.

Bangkok's countermove is a new excise category for 48-volt mild hybrids: 10% for vehicles under 100g/km of CO2 and 12% for 101–120g/km, guaranteed through 2032, provided manufacturers invest at least 5 billion baht, build batteries locally from 2026, source motors or assist components domestically from 2028, and fit four of six advanced driver-assistance features. Because mild hybrids preserve nearly the entire combustion drivetrain that Thai suppliers produce, the category protects the existing parts ecosystem. Mazda quickly won Board of Investment approval for more than 7.4 billion baht at its Rayong alliance to build a small hybrid SUV from 2027, Isuzu is committing over 15 billion baht largely for Euro 6 pickup capability, and Mitsubishi has outlined 16 billion baht over five years for hybrid development.

Ekniti has ordered permanent secretary Lavaron Sangsnit and Excise Department director-general Pornchai Theeravech to complete the new structure by September, issued as a ministerial regulation that can take effect this year without a parliamentary vote. Since tariffs on Chinese vehicles are locked down by the ASEAN-China free trade agreement, excise policy is the one remaining lever: lower rates for factories operating in Thailand with local parts, standard rates for finished imports.

With more than 2,400 supplier companies and over 700,000 jobs at stake, the rewrite will shape what buyers see well beyond Thailand, including the diesel pickups exported to Australia, Britain, South Africa and the Gulf. A country that spent four decades persuading Japan to build its auto industry, then three subsidizing rivals, will learn in September who pays the bill.