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Gurbuz Law

CBAM’s Definitive Period: Contract and Data Requirements for Turkish Exporters and EU Importers

The CBAM definitive regime began on 1 January 2026. The legal declaration and certificate obligations sit with the authorised CBAM declarant in the EU, but the accuracy of the declaration depends heavily on installation, production-route, embedded-emissions and carbon-price data supplied from Türkiye. The supply contract therefore needs a detailed data, verification, audit, correction, carbon-cost and…

Published by: Gurbuz Law

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Legal position last verified: 1 September 2026.

The CBAM definitive regime began on 1 January 2026. The legal declaration and certificate obligations sit with the authorised CBAM declarant in the EU, but the accuracy of the declaration depends heavily on installation, production-route, embedded-emissions and carbon-price data supplied from Türkiye. The supply contract therefore needs a detailed data, verification, audit, correction, carbon-cost and liability architecture.123

This guide is for Turkish installation operators and exporters, EU importers, procurement and sustainability teams in the iron and steel, aluminium, cement, fertiliser, electricity and hydrogen value chains.

Core conclusion: A CBAM clause is not a one-sided transfer of the importer’s regulatory duty; it is a bilateral data-governance system that makes installation information timely, verifiable and contractually usable.

Who is this guide for?

This guide is for Turkish installation operators and exporters, EU importers, procurement and sustainability teams in the iron and steel, aluminium, cement, fertiliser, electricity and hydrogen value chains.

Decision summary in one minute

Area EU importer Turkish supplier/installation Contract outcome
Regulatory role Authorised CBAM declarant Source of installation and product data Role and contact matrix
Emissions calculation Files declaration and surrenders certificates Monitors and calculates Methodology schedule
Verification Uses verification report Supports accredited verifier Audit and cooperation
Carbon price Claims deduction Proves price paid Evidence and warranty
Cost Bears certificate exposure Bears data and improvement cost Price-adjustment formula
Error Correction and authority exposure Inaccurate or late data exposure Indemnity and cap architecture

1. Who must do what in the definitive regime?

An EU importer or indirect customs representative exceeding the single 50-tonne mass threshold for CBAM goods must operate through authorised CBAM-declarant status. The declaration and certificate obligations remain on the EU side; the Turkish supplier is not the declarant merely because it manufactures the goods.4

Actual-emissions reporting nevertheless depends on the non-EU installation’s calculation and evidence system. A generic promise to “comply with CBAM” should be replaced by product-code, installation, production-route and reporting-period schedules.5

2. How should embedded-emissions data be contractualised?

The agreement should include a methodology schedule defining direct and, where relevant, indirect emissions, system boundaries, precursor inputs, production quantities, assumptions and source records. Methodology versions and change control should be auditable.67

Data delivery should not be left to a single annual deadline. Monthly or quarterly provisional data, year-end reconciliation and a defined correction window reduce the importer’s declaration and certificate risk.89

3. Verification and Registry access

Commission guidance published in August 2026 clarifies verification of non-EU installation data. Accredited verifiers can begin obtaining Registry access from 1 September 2026, supporting verification reports used for 2026 imports from 2027.10

The supplier should provide reasonable access, record retention, sampling and explanation support. The importer should communicate verification timing, scope and cost allocation in advance.11

4. Carbon-price deductions and evidence

A carbon price effectively paid in the country of production may reduce certificate exposure subject to the regulatory conditions. The contract should address proof of tax or ETS payment, free allocation, rebates, support, exchange rates and period matching.12

The supplier should link the evidence to the relevant installation and production period. A rejected deduction should not automatically be transferred to the supplier; the contract should distinguish regulatory interpretation from supplier-caused evidential failure.13

5. Price adjustment and liability architecture

CBAM cost cannot be managed reliably through a fixed percentage added to price. Certificate price, emissions intensity, free-allocation adjustment and delivery period can change. The parties should agree an objective formula, data source, cap and renegotiation trigger.14

A separate liability cap can address inaccurate data, with tailored carve-outs for intentional manipulation or obstruction of verification. Importer-caused authorisation or filing failures should not be shifted to the supplier.15

6. Supplier selection and low-carbon investment

CBAM contracting is also a procurement decision. Production route, energy source and improvement roadmap may be linked to long-term volume and price commitments.16

Where the importer funds improvements or pays a green premium, the baseline, target, measurement method, independent verification and consequences of underperformance should be explicit.17

Documents and evidence the company should prepare

  • CN code and product-scope table
  • Installation and production-route records
  • Emissions monitoring plan and data dictionary
  • Precursor supplier data
  • Evidence of carbon price paid
  • Verifier access and reports
  • Monthly/quarterly data reconciliations
  • CBAM price-adjustment calculation

Contract and governance controls

  • Role and authorised-declarant status
  • Product, installation and methodology schedule
  • Data timetable and format
  • Verification and audit rights
  • Carbon-price evidence
  • Change and correction process
  • Price-adjustment formula
  • Inaccurate data, indemnity and liability cap
  • Record retention and confidentiality
  • Termination and transition support

Red flags and recurring mistakes

  • A one-line “CBAM compliance” warranty
  • Failure to map product codes to installations
  • Requesting data only at year-end
  • Ignoring default-value exposure in pricing
  • Transferring importer-caused non-compliance to the supplier
  • No verifier access or record-retention clause

Three practical scenarios

1. Precursor-data gap in steel exports

A Turkish rolling mill cannot obtain reliable precursor emissions data. The parties agree a temporary default-value approach, an improvement timetable and a fault-based allocation of the resulting price difference.

2. EU importer crosses the 50-tonne threshold

Once annual imports cross the mass threshold, authorisation and data processes must activate quickly. A supplier lacking historical records may face contractual default and shipment interruption.

3. Green premium for an emissions-reduction project

An EU buyer offers volume commitment for an electric-arc and renewable-energy project. Baseline, measurement period, verification and clawback conditions are documented in a dedicated schedule.

A 30–60–90-day implementation plan

Days 1–30 — scope and visibility

  • Build the CBAM contract and data scope and role matrix.
  • Collect the relevant contracts, permissions, data and decision records.
  • Assign owners to urgent gaps and threshold questions.

Days 31–60 — evidence and contracting

  • Complete missing permissions, policies, schedules and records.
  • Obtain management approval for the decision matrix.
  • Test group-company and supplier flows against the chosen model.

Days 61–90 — testing and governance

  • Run a practical scenario or tabletop exercise.
  • Report open risks with owners and closure dates.
  • Establish annual and event-driven review triggers.

Frequently asked questions

Is the Turkish exporter the CBAM-obliged declarant?

The declaration and certificate duty generally sits with the authorised CBAM declarant in the EU; the Turkish installation supplies the underlying data and contractual cooperation.

What does the 50-tonne threshold mean?

A single mass-based threshold applies at importer level for relevant CBAM goods, subject to product scope and exceptions.

Can default values be used where actual data are unavailable?

Where permitted by the rules, default values may be used, but their commercial and contractual consequences should be allocated in advance.

May a verifier access the Turkish installation?

The contract should provide the records, explanations and reasonable access needed to verify actual emissions.

Who purchases CBAM certificates?

The authorised CBAM declarant manages certificate obligations through the competent EU system.

Can a carbon price paid in Türkiye reduce CBAM exposure?

A qualifying carbon price effectively paid may be recognised if the evidence and period allocation satisfy the rules.

Can the importer automatically pass all CBAM cost to the supplier?

No. Regulatory responsibility, price and supplier-caused data failure should be separated contractually.

Must every supply contract be amended?

Contracts for in-scope goods and data-dependent supply chains should be reviewed on a risk basis.

Conclusion

In the definitive period, competitive advantage comes not only from lower-carbon production but also from reliable, timely data. Turkish suppliers and EU importers should govern product, installation, methodology, verification, pricing and liability through a measurable contractual schedule.

This article provides general information only. It is not a legal opinion for a particular company, transaction, tax position, licence application or dispute. Applicable sector, tax, employment and regulatory rules require a fact-specific review.

Bibliography

Footnotes

  1. European Commission — CBAM Definitive Regime https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-definitive-regime_en accessed 1 September 2026. Definitive period from 1 January 2026, the 50-tonne threshold, authorised CBAM declarant and covered sectors.↩︎

  2. European Commission — 2026 Guidance for Non-EU Installation Operators https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-legislation-and-guidance_en accessed 1 September 2026. Embedded-emissions calculation, default values, sector guidance and verification readiness.↩︎

  3. European Commission — CBAM Verifier Guidance, 24 August 2026 https://taxation-customs.ec.europa.eu/news/european-commission-publishes-guidance-cbam-verifiers-and-accreditation-bodies-2026-08-24_en accessed 1 September 2026. Accredited verifiers and the Registry-access process after 1 September 2026.↩︎

  4. European Commission — CBAM Definitive Regime https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-definitive-regime_en accessed 1 September 2026. Definitive period from 1 January 2026, the 50-tonne threshold, authorised CBAM declarant and covered sectors.↩︎

  5. European Commission — CBAM Definitive Regime https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-definitive-regime_en accessed 1 September 2026. Definitive period from 1 January 2026, the 50-tonne threshold, authorised CBAM declarant and covered sectors.↩︎

  6. European Commission — 2026 Guidance for Non-EU Installation Operators https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-legislation-and-guidance_en accessed 1 September 2026. Embedded-emissions calculation, default values, sector guidance and verification readiness.↩︎

  7. Carbon Border Adjustment Mechanisms: A Systematic Review https://doi.org/10.53662/esamdergisi.1811863 accessed 1 September 2026. Systematic academic review of CBAM’s effects on trade, emissions data and supply chains.↩︎

  8. European Commission — 2026 Guidance for Non-EU Installation Operators https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-legislation-and-guidance_en accessed 1 September 2026. Embedded-emissions calculation, default values, sector guidance and verification readiness.↩︎

  9. Carbon Border Adjustment Mechanisms: A Systematic Review https://doi.org/10.53662/esamdergisi.1811863 accessed 1 September 2026. Systematic academic review of CBAM’s effects on trade, emissions data and supply chains.↩︎

  10. European Commission — CBAM Verifier Guidance, 24 August 2026 https://taxation-customs.ec.europa.eu/news/european-commission-publishes-guidance-cbam-verifiers-and-accreditation-bodies-2026-08-24_en accessed 1 September 2026. Accredited verifiers and the Registry-access process after 1 September 2026.↩︎

  11. European Commission — CBAM Verifier Guidance, 24 August 2026 https://taxation-customs.ec.europa.eu/news/european-commission-publishes-guidance-cbam-verifiers-and-accreditation-bodies-2026-08-24_en accessed 1 September 2026. Accredited verifiers and the Registry-access process after 1 September 2026.↩︎

  12. European Commission — CBAM Definitive Regime https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-definitive-regime_en accessed 1 September 2026. Definitive period from 1 January 2026, the 50-tonne threshold, authorised CBAM declarant and covered sectors.↩︎

  13. European Commission — CBAM Definitive Regime https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-definitive-regime_en accessed 1 September 2026. Definitive period from 1 January 2026, the 50-tonne threshold, authorised CBAM declarant and covered sectors.↩︎

  14. Carbon Border Adjustment Mechanisms: A Systematic Review https://doi.org/10.53662/esamdergisi.1811863 accessed 1 September 2026. Systematic academic review of CBAM’s effects on trade, emissions data and supply chains.↩︎

  15. Carbon Border Adjustment Mechanisms: A Systematic Review https://doi.org/10.53662/esamdergisi.1811863 accessed 1 September 2026. Systematic academic review of CBAM’s effects on trade, emissions data and supply chains.↩︎

  16. European Commission — 2026 Guidance for Non-EU Installation Operators https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-legislation-and-guidance_en accessed 1 September 2026. Embedded-emissions calculation, default values, sector guidance and verification readiness.↩︎

  17. European Commission — 2026 Guidance for Non-EU Installation Operators https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-legislation-and-guidance_en accessed 1 September 2026. Embedded-emissions calculation, default values, sector guidance and verification readiness.↩︎

Publication record

About this study

Published by
Gurbuz Law
First published
23 September 2026
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For the scope of publication and use, see Publishing principles and terms.

Scope and currency

This study is provided for general information only; it is not legal advice on a specific matter. Legislation, case law and practice may have changed since publication, and the current position should be assessed separately.

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