CBAM Starts With Your Heatsink, Not Your Factory

Carbon border adjustment is usually read as a steel and cement story, which is why electronics importers have largely ignored it. That is a mistake. The mechanism covers aluminium and steel goods by customs code, and a heatsink, an extruded enclosure, a chassis rail or a DIN bracket is an aluminium or steel good before it is a component.

Where the rules stand

CBAM entered its definitive regime on 1 January 2026. Importers bringing more than 50 tonnes a year of covered steel, aluminium, cement and fertiliser into the EU must hold authorised declarant status, record the imports, calculate embedded emissions and surrender certificates. The threshold is a single cumulative net-mass test per importer per calendar year, across all covered codes — not 50 tonnes per product, per supplier or per shipment. Electricity and hydrogen are covered with no threshold at all.

Two dates matter more than the rest. Certificates for 2026 emissions go on sale on 1 February 2027. The first annual declaration and certificate surrender, covering 2026 imports, is due on 30 September 2027. From 2027, holdings must also cover at least 50 percent of the year’s embedded emissions at the end of each quarter, so the cash exposure starts earlier than the filing deadline suggests.

For 2026, the Commission publishes a certificate price per quarter of import based on EU ETS auction averages: 75.36 euros per tonne of CO2 for the first quarter, 75.28 for the second, and 82.32 for the third. The fourth-quarter price has not been published. From 2027 the price moves to a weekly calculation.

Why the 50 tonnes is closer than it looks

A mid-size importer of aluminium heatsinks will cross 50 tonnes without trying. Extruded heatsinks are dense, and a container of 200-watt class profiles reaches tens of tonnes quickly. The same arithmetic applies to steel chassis, shielding cans and mounting rails if they fall under the listed CN codes. Once the threshold is crossed in a calendar year, the obligations apply to all covered imports in that year, including the tonnes that arrived before the threshold was reached.

Classification is where most importers will lose time. Scope is set by Combined Nomenclature code and, in some cases, TARIC code, not by whether the finished product feels like electronics. A product that looks finished can sit under an in-scope code, and a steel-containing assembly is not automatically covered. The customs code and the CBAM code have to be owned by the same person, recorded together with product description, country of origin, importer of record, net mass and declaration reference.

Actual data or default values

Declarants can use verified actual emissions from the producing installation or the Commission’s default values. The default values carry a mark-up of 10 percent in 2026, 20 percent in 2027 and 30 percent from 2028, with a lower 1 percent mark-up for fertilisers. That escalating penalty is deliberate: it is designed to make supplier data collection worth the effort. For an importer with a Chinese or Turkish extrusion supplier, the difference between default and actual values can be the difference between a manageable line item and a painful one.

The Commission corrected the definitive-period default-value tables in July and August 2026. Any cost model built earlier in the year has to be re-run against the corrected dataset for the whole of 2026.

The next expansion is the one to plan for

The Commission has proposed extending CBAM from 1 January 2028 to around 180 steel- and aluminium-intensive downstream products, from fasteners and radiators to machinery parts. The Council has refined the list; Parliament’s version is more than twice as long. Political trilogues are scheduled for 20 October and 30 November 2026, with an agreement targeted before the end of the year. A separate July 2026 proposal to revise the EU ETS would slow the phase-out of free allocation, and with it the rise in CBAM cost, until 2038.

Read that as a two-year warning. A component that is out of scope in 2026 can be in scope in 2028, and the data needed to declare it has to be collected from the supplier at the time of production, not reconstructed from emails two years later.

What to do this quarter

• Map tonnage by code. Pull twelve months of customs entries, sum net mass for steel and aluminium codes, and find out whether you are above or below 50 tonnes. Most importers have never done this arithmetic.
• Decide who is the declarant. If you buy on DDP terms through a forwarder or an indirect customs representative, confirm in writing who holds the authorised declarant role. The liability follows the importer of record, not the supplier.
• Ask suppliers for installation-level data now. Embedded emissions, production route, electricity source and any carbon price already paid. Suppliers who cannot produce this in 2026 will not produce it under deadline pressure in 2027.
• Put the clause in the purchase contract. A data-delivery obligation with a remedy is worth more than a promise. Add it to the next PO, not the next annual agreement.
• Model the aluminium price twice. CBAM adds a carbon cost per tonne on top of the metal and the extrusion premium. For a heatsink programme, that is a third cost line most quotes do not show.

We quote aluminium heatsinks, extruded enclosures and sheet-metal parts with the origin, alloy and mill certificate stated, and we can supply the production-route information your declarant needs. Mechanical and thermal parts are quoted alongside the board in our PCBA and box-build service, and the electrical content is in the component catalogue. Send the drawing and the destination market through the inquiry form and we will return a quote with the metal and carbon inputs separated.