The EU Carbon Border Adjustment Mechanism entered its definitive period on January 1, 2026. For construction importers, CBAM is not just a sustainability report produced after customs clearance. It can change whether a steel, aluminium, or cement offer is importable, what supplier evidence is worth requesting, and how much carbon-cost exposure belongs in landed cost.

This guide was reviewed on July 11, 2026. It is deliberately limited to procurement planning for construction-sector iron and steel, aluminium, and cement goods. The exact CBAM scope is defined by CN codes in the regulation—not by a supplier's broad product family or by the fact that a product will be used in construction.

Short answer: what must a construction importer do for CBAM in 2026?

An EU importer of construction-sector iron, steel, aluminium, or cement goods should classify every customs line against the current CBAM scope, track cumulative covered net mass from the first tonne, and secure the required CBAM account or application reference before crossing the applicable 50-tonne annual threshold. For each covered line, retain the importer, declarant, CN code, origin, producer installation, import quarter, net mass, default or verified actual-emissions basis, and evidence owner. Accrue certificate exposure using the official price for that import quarter, then reconcile 2026 imports for the first annual declaration and certificate surrender due September 30, 2027.

The 2026 buyer facts that control the workflow

As of this review date:

  • The definitive CBAM period started on January 1, 2026.
  • For the mass-threshold sectors relevant here, an importer or indirect customs representative importing more than 50 tonnes of net mass of CBAM goods during the calendar year needs the required CBAM account number or application reference. The threshold is cumulative per importer, not a per-shipment allowance.
  • Electricity and hydrogen follow different threshold treatment and are outside this construction-material workflow.
  • The first annual CBAM declaration for 2026 imports and the corresponding certificate surrender are due by September 30, 2027.
  • CBAM certificates covering 2026 imports become available for purchase through the common central platform from February 2027.
  • The Commission published 2026 certificate prices of EUR 75.36/tCO2e for Q1 and EUR 75.28/tCO2e for Q2. Each quarterly price applies to emissions embedded in CBAM goods imported during that quarter.
  • Annual declarations can use Commission default values or actual emissions values. Actual emissions used in the declaration require verification by an appropriately accredited independent verifier under the definitive-period rules.

These dates, thresholds, and prices are official facts, but they are not a complete shipment calculation. The number of certificates depends on the regulation's embedded-emissions calculation, free-allocation adjustment, any allowable carbon-price deduction, and the evidence basis used for the specific goods.

Track from the first tonne, not the fifty-first

The 50-tonne threshold is a calendar-year control. A buyer who waits until one large shipment crosses the threshold may already have lost the evidence needed for earlier imports.

Maintain one cumulative register across all business units, brokers, ports, suppliers, origins, and relevant CN codes. For each customs line, record:

  • importer legal entity and EORI;
  • customs declarant and direct or indirect representation model;
  • CBAM account number or application reference where required;
  • eight-digit CN code used in the customs declaration;
  • product description and CBAM sector;
  • country of origin;
  • customs declaration date and reference;
  • net mass in tonnes;
  • quarter of import;
  • supplier, producer, installation, and production route;
  • emissions basis: unresolved, Commission default, or actual verified value;
  • evidence and cost status.

Do not split the monitoring by broker or purchase order. The threshold attaches to cumulative imports by the relevant importer over the calendar year. If the threshold is exceeded, the annual declaration requires the regulated quantity and emissions information for the year; the buyer therefore needs a record of earlier covered lines as well.

Confirm CBAM scope at customs-line level

CBAM scope is driven by the CN codes listed in Annex I of Regulation (EU) 2023/956 as amended. A project label such as "steel structure," "aluminium façade," "fixings," "cement board," or "construction kit" is not enough.

Before the purchase order:

  1. Split the commercial package into physical customs lines.
  2. Record a planning CN code and the reason for it.
  3. Confirm the current code and CBAM scope with the responsible customs professional.
  4. Keep non-covered accessories or components separate from covered goods.
  5. Re-check the line if material, composition, manufacturing, presentation, or customs treatment changes.

This boundary matters for finished or downstream products. Do not assume every construction item containing steel or aluminium is covered, and do not assume a fabricated product is outside CBAM merely because it is no longer raw material.

Use the steel-fastener classification workflow for an example of why seemingly similar metal products still need line-level classification evidence.

Separate authorisation, customs, emissions, and finance owners

CBAM touches several functions, but responsibility cannot disappear between them.

ControlMinimum owner questionEvidence gate
Importer and authorisationWhich legal entity is the importer, and who holds the CBAM account or application reference?EORI, registry/account status, representation agreement
Customs scopeWhich declared CN lines are in Annex I and how is cumulative net mass controlled?Classification record, customs declarations, threshold ledger
Supplier dataWhich non-EU installation and production route made the goods?Operator and installation identity, product/precursor map
Embedded emissionsWill the declaration use Commission defaults or actual values?Dated default source or complete actual-emissions communication
VerificationIf actual values are used, who verified them and what exact period/products are covered?Accredited verifier identity, verification report and scope
Carbon price paidIs a foreign carbon-price deduction claimed and is the effective payment evidenced?Applicable official method and proof of amount effectively paid
FinanceHow is quarterly certificate exposure accrued and funded for 2027 purchase/surrender?Import-quarter price, modeled certificate quantity, owner and cash plan

The authorised CBAM declarant can delegate preparation or submission tasks, but the regulation keeps responsibility with that declarant. Record responsibility explicitly rather than treating the broker, sustainability consultant, supplier, or verifier as the default owner of the whole file.

Choose default or actual emissions deliberately

The Commission publishes definitive-period default values for covered goods. Defaults provide a usable evidence path when verified actual data is unavailable, but they are not a substitute for knowing which product, origin, quarter, and methodology apply.

For a default-value case, retain:

  • exact CN/product category and origin;
  • official default-value source and publication version;
  • access/check date;
  • value selected and unit;
  • reviewer and rationale;
  • free-allocation adjustment method used in the cost model;
  • import quarter and official certificate price.

For an actual-value case, start with the supplier's producing installation—not the trading company. The Commission's communication template and sector examples are designed to pass installation and product data to importers.

Request and map:

  • installation and operator identity;
  • production route and reporting period;
  • product category and quantity;
  • direct emissions and applicable indirect-emissions treatment;
  • precursor identities, installations, quantities, and embedded emissions where required;
  • monitoring and calculation methodology;
  • data sources, meter/fuel/material records, and calculation sheets supporting the communication;
  • verifier identity, accreditation scope, verification period, opinion, corrected misstatements, and product coverage;
  • version, approval date, and link between the verified data and the imported line.

A supplier spreadsheet that contains a number labelled "CBAM emissions" is not automatically actual verified emissions. Keep the status unresolved until the installation, methodology, reporting period, product coverage, and verifier evidence reconcile.

Accrue carbon exposure by import quarter

The official Q1 and Q2 certificate prices are not customs duties and are not purchased at the border in 2026. They are inputs for the financial exposure attached to the emissions in goods imported during those quarters; certificates for 2026 imports can be purchased from February 2027 and must be available for the September 30, 2027 surrender.

Build a dated planning calculation for every covered import line:

  1. Confirm net mass and import quarter.
  2. Select the documented default or actual verified emissions basis.
  3. Apply the definitive-period calculation and free-allocation adjustment with the responsible CBAM professional.
  4. Apply any eligible foreign carbon-price deduction only when the required evidence exists.
  5. Multiply the resulting certificate quantity by the official price for the import quarter.
  6. Separate economic accrual from customs-day cash and from the future certificate-purchase cash requirement.
  7. Reconcile line totals to the annual CBAM declaration and the certificate funding plan.

Do not apply one current ETS headline price to the whole year. Q1 2026 imports use the Q1 CBAM certificate price; Q2 imports use the Q2 price. Future quarters should remain unresolved until the Commission publishes their official prices.

For a dated product example, see the 20-tonne rebar-to-Hamburg case. Its base case deliberately assumes the importer's annual aggregate crosses the threshold even though the individual shipment is only 20 tonnes.

Put supplier evidence into the RFQ and purchase order

CBAM data quality is a sourcing variable. Ask for it before ranking suppliers, and write the delivery mechanism into the commercial file.

The RFQ should state:

  • buyer's planning CN code and request for supplier review without transferring final classification responsibility;
  • producer and installation identity for every relevant product;
  • production route and precursor map;
  • whether the supplier proposes default or actual-emissions evaluation;
  • Commission communication-template availability;
  • actual-data calculation and verification status;
  • reporting period, refresh timing, and change notification;
  • permitted buyer use of the data for CBAM compliance and professional review;
  • response owner, deadline, version, and correction process;
  • consequence of missing data in supplier evaluation, such as use of the documented official default in the landed-cost comparison.

Do not promise a contract deduction based on an unverified carbon number. State the buyer's evaluation rule: unresolved data will be modeled conservatively, and the final customs/CBAM treatment remains subject to responsible professional confirmation.

Use the construction-material RFQ template for the product and commercial layer, then attach the CBAM register below for the carbon-evidence layer.

Use four decision gates

Before supplier ranking

  • Confirm candidate CN lines and likely CBAM scope.
  • Estimate the importer's cumulative annual net mass across covered sectors.
  • Identify the importer, declarant, CBAM account/application status, and internal owner.
  • Compare suppliers with a default-value scenario when verified actual data is missing.

Before deposit

  • Freeze producer and installation identity.
  • Agree the emissions communication, verification, update, and correction obligations.
  • Record the certificate-price and free-allocation basis used in the landed-cost model.
  • Keep unresolved actual-data claims from displacing the default scenario.

Before dispatch and customs declaration

  • Reconcile purchase-order line, invoice, packing list, origin, CN code, net mass, producer, and installation.
  • Confirm account/application reference and customs-representation instructions where required.
  • Record the expected import quarter and update the certificate-price field when published.
  • Preserve the final evidence package used for the shipment decision.

Before annual declaration and surrender

  • Reconcile every customs declaration and covered line for 2026.
  • Resolve default versus actual verified emissions and any foreign carbon-price deduction.
  • Review verifier scope, corrected misstatements, and installation/product coverage.
  • Reconcile modeled certificate quantity, purchases, available balance, declaration, and surrender by September 30, 2027.

Download the CBAM construction-import register

Download the 2026 CBAM construction-import evidence register. It connects governance, threshold monitoring, customs lines, producer installations, default/actual emissions, verification, carbon-price evidence, quarterly certificate prices, accrual, declaration, and approval status.

The register includes the Commission's published Q1 and Q2 2026 certificate prices with source dates. It leaves Q3 and Q4 blank until their scheduled publication. It contains no invented supplier emissions, certificate quantities, classifications, or carbon-price deductions.

Primary references

This guide is procurement planning, not legal, customs, emissions-verification, accounting, or tax advice. Confirm scope, authorisation, calculation, verification, declaration, certificate, and deduction treatment with the responsible qualified professionals for the importer and transaction.