Thailand Prepares Car Tax Rewrite as Japanese Automakers Press Their Case

Prime Minister Anutin Charnvirakul chose a distant stage to address a sensitive rumor back home. Speaking to reporters in Wellington on August 21 during a visit to New Zealand, he rejected suggestions that Japanese manufacturers were pulling their production bases out of Thailand, citing headline foreign investment figures as evidence. Yet in the same appearance he announced that Deputy Prime Minister and Finance Minister Ekniti Nitithanprapas would lead a review into whether the country's tax framework treats long-established producers fairly — a move that itself signals the government sees a problem.

At the heart of the dispute are Thailand's electric vehicle incentive schemes, EV 3.0 and its follow-up EV 3.5. Under them, companies could bring in battery-powered cars at a reduced 2 percent excise rate rather than the standard 8 percent, with import duties capped and subsidies of up to 150,000 baht per vehicle for buyers. In exchange, each importer owed Thailand local production: EV 3.5 required two domestically assembled cars for every one brought in by 2026, rising to three-for-one in 2027 if the initial target was missed.

Those obligations function like a loan repaid in vehicles. Firms that shipped in large volumes during 2023 and 2024 must keep Thai plants running at pace through 2026 and 2027 regardless of demand, because falling short means returning the subsidies, covering the excise gap, and paying penalties. Critics argue this engineered the oversupply now driving showroom price wars. The system's fragility was exposed when Chinese-backed Neta entered bankruptcy proceedings, leaving its Thai operation owing around 24,000 offset vehicles while having produced only about 4,700 — despite collecting more than 2 billion baht in subsidies. Regulators responded with monthly production forecasts, suspended payouts, and bank guarantees, but dealers were left chasing unpaid bills.

The strain is visible across the industry. Subaru's contract assembler halted Thai output at the close of 2024, and Suzuki will shut its Pluak Daeng plant — born of the 2007 Eco Car program — by the end of 2025, describing the move as optimizing global production within the group. Honda stopped vehicle assembly at its Ayutthaya facility dating to 1996, folding that work into Prachinburi, as combined capacity of 270,000 units confronted four consecutive years of output below 150,000. There is precedent for concern: when General Motors departed in 2020, China's Great Wall Motor acquired its Rayong plant.

What Japanese firms are pursuing, however, is lobbying rather than departure. Koji Iwanami, president and CEO of Honda Automobile (Thailand), used the local debut of the Super-ONE EV to argue that fully built cars from Japan, Europe, and the United States face import duties of up to 80 percent, while battery and range-extended EVs from certain free-trade partners enter duty-free. Honda seeks near-parity so it can import models such as the Freed and Jazz — impossible to build locally now that Prachinburi is pressing against its 110,000-unit cap.

A second demand involves tightening local-content thresholds hybrids must satisfy to retain preferential excise rates. Honda contends four of its hybrid models cannot realistically be re-engineered mid-cycle and would see excise climb from 6 percent to 8 percent and then 10 percent — painful in a market where elevated household debt has suppressed lending for three years. Honda and five other Japanese brands are coordinating an eight-point agenda through the Japanese Chamber of Commerce in Bangkok. Toyota has lodged parallel objections that imported EVs enjoy a lighter effective tax burden than Thai-built vehicles, while publicly ruling out any exit after Indonesia's finance minister publicly invited it to relocate regional production to Jakarta on August 4.

Bangkok's counteroffer leans on mild hybrids. The National EV Policy Committee has carved out an MHEV excise band — 10 percent below 100g/km of CO2, 12 percent for 101–120g/km — guaranteed for seven years through 2032, contingent on investment of at least 5 billion baht, locally made batteries from 2026, locally sourced motors or assist components from 2028, and four of six advanced driver-assistance features. Because 48-volt systems preserve engines, transmissions, exhausts, and fuel systems, they protect the component makers who dominate Thailand's supply base of more than 2,400 firms and 700,000 workers. Mazda secured Board of Investment approval for over 7.4 billion baht at the AutoAlliance Rayong site for a mild-hybrid SUV from 2027; Isuzu is committing more than 15 billion baht, much of it for Euro 6 pickup capability, and Mitsubishi has sketched out 16 billion baht over five years for hybrids.

Ekniti has ordered finance permanent secretary Lavaron Sangsnit and Excise Department director-general Pornchai Theeravech to complete a new excise structure by September. Issued as a ministerial regulation under the Excise Tax Act, it can take effect within 2026 without parliamentary approval. The design logic is pointed: tariffs on Chinese cars are frozen by the ASEAN-China free trade agreement, but excise tax is domestic law, so favoring producers with Thai factories and Thai parts achieves tariff-like effects without breaching treaties.

For consumers, the stakes range from warranty security — a lesson Neta owners learned the hard way — to the fate of the one-tonne diesel pickup, whose biggest right-hand-drive export markets in Australia, the UK, South Africa, and the Gulf depend on what Bangkok decides. Thailand spent four decades coaxing Japan into building its automotive industry; the September rewrite will determine how much of it survives the EV era.

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