Japan's Ministry of Economy, Trade and Industry confirmed on 14 May 2026 that the carbon border adjustment bill — long delayed since first drafted in 2023 — will go to a full Diet vote in the July session. Implementation, if passed, would phase from 1 January 2028 across three sectors: cement, steel and aluminium. A second phase covering chemicals and ceramics is expected by 2030.
What the Japanese mechanism does differently from the EU's
The Japanese CBAM tracks the EU model in headline structure — emissions-intensity benchmark, importer reporting obligations, certificate purchase tied to the JPN ETS price — but diverges in three specific ways. First, the certificate price is decoupled from the ETS spot in the early years and set by a separate METI committee to avoid the volatility that EU importers faced in 2023-2024. Second, the exemption pathway for cleaner foreign producers is more administratively forgiving: a third-party audit by a Japan-recognised body suffices, rather than requiring registration in a Japanese accreditation framework. Third, the early-phase rates are set at roughly half the EU's equivalent, with full convergence only by 2032.
Which Asian producers are repositioning
South Korea is the largest exporter of steel to Japan and the most directly affected. POSCO has been gradually shifting its export blend toward higher-grade products from Pohang's new EAF lines (commissioned 2024) — products whose carbon intensity is approximately 35% below blast-furnace equivalents. The strategic logic is straightforward: the lower-carbon mix carries lower CBAM cost.
Vietnam, which has emerged as a meaningful aluminium exporter to Japan since 2022, is structurally disadvantaged — the Hoa Phat smelter is still coal-grid-dependent and the carbon intensity is at the high end of the regional benchmark. Indonesian aluminium producers (PT INALUM and the new Mempawah complex) are slightly better positioned because of their captive renewable supply.
China is the wild card. Chinese steel and aluminium exports to Japan have declined substantially since 2023 due to the existing anti-dumping framework, and the additional CBAM cost would compound that — but Chinese producers have been the most aggressive in pursuing exemption pathways through factory-level emissions verification programmes, and several of the eastern coastal mills have credible documentation packages.
Trade flow implications
Three observable trends in the first quarter of 2026 already point ahead of the bill's vote. First, ASEAN-to-Japan aluminium shipments are diversifying — Indonesian volume is up 18% while Vietnamese is flat. Second, Korean steel exports are migrating to the lower-carbon-intensity grade categories, with the higher-grade share rising from 41% to 49% over twelve months. Third, the regional certificate-trading platforms (Singapore's Climate Impact X, the new Tokyo TSEAEX) are seeing volumes that suggest pre-positioning for compliance.
The bill, if it passes in July, will not change the existing carbon-intensity rankings of Asian producers — but it will sharpen the cost penalty for the laggards and accelerate the capital reallocation that has been latent for two years.