Regulation (EU) 2025/2083 amended CBAM across 7 parameters on October 17, 2025, resetting deadlines, thresholds, and penalties that EU importers had been planning against since 2023. The original Regulation (EU) 2023/956 set rules for the definitive phase, but the Omnibus overturned five financial parameters, one authorization process, and the entire penalty structure before the definitive phase even began. Any compliance plan built on pre-Omnibus numbers, such as the May 31 declaration deadline or the €150 de minimis threshold, requires a full review.
This article covers all 7 changes introduced by Regulation (EU) 2025/2083, with the exact before-and-after values, the regulatory articles each change amends, and the practical consequence for authorized declarants importing steel, cement, aluminium, fertilizers, electricity, and hydrogen.
What Is the CBAM Omnibus Regulation (EU) 2025/2083?
Regulation (EU) 2025/2083 is a major amendment to the primary CBAM regulation, Regulation (EU) 2023/956, adopted on October 8, 2025, and published in the Official Journal of the EU on October 17, 2025 (the same date it entered into force). Its stated purpose is simplification: reducing compliance burden for EU importers, particularly small and medium-sized importers, while preserving the environmental integrity of CBAM.
The Omnibus does not change the sectors covered by CBAM, the legal basis (Article 192(1) TFEU), or the mechanism type. CBAM remains a certificate-based system linked to the EU ETS carbon price, covering six sectors: iron and steel, cement, aluminium, fertilizers, electricity, and hydrogen. What changed are the operational parameters: the timeline for declarations and certificate purchases, the volume thresholds that trigger obligations, and the financial penalties for violations. For a full introduction to how the EU CBAM mechanism works before examining these 7 parameter changes, the EU CBAM guide provides the foundational overview.
The complete list of changes introduced by Regulation (EU) 2025/2083 and their regulatory article citations appears in the table below.
| Parameter | Pre-Omnibus Value | Post-Omnibus Value | Article Amended |
|---|---|---|---|
| Annual declaration deadline | May 31 | September 30 | Article 6 |
| Certificate sales start | January 1, 2026 | February 1, 2027 | Article 22 |
| De minimis threshold | €150 per consignment | 50 tonnes annual mass per importer | Article 2(3a) |
| Quarterly holding requirement | 80% of cumulative embedded emissions | 50% of cumulative embedded emissions | Article 22(2) |
| Buyback limit | One-third of annual purchases | 50% of annual purchases | Article 23 |
| Penalty (authorized declarant) | Variable by member state | €100/tCO₂e (harmonized) | Article 26(1) |
| Penalty (unauthorized importer) | Variable by member state | €300–500/tCO₂e (harmonized) | Article 26(2) |
Caption: Regulation (EU) 2025/2083 changed 7 CBAM parameters effective October 17, 2025. The pre-Omnibus values, established in Regulation (EU) 2023/956, no longer apply.
The 7 Changes Made by Regulation (EU) 2025/2083
The 7 changes introduced by Regulation (EU) 2025/2083 fall into three categories: timeline adjustments (Changes 1 and 2), threshold changes (Changes 3 and 4), and financial parameter changes (Changes 5, 6, and 7). Each is addressed in sequence, with the exact regulatory citation.
Change 1: Declaration Deadline Moved from May 31 to September 30
The annual CBAM declaration deadline under Regulation (EU) 2025/2083 is September 30 of the year following each import year (Article 6, as amended). The pre-Omnibus deadline was May 31 of the following year.
The first CBAM declaration deadline is September 30, 2027, covering calendar year 2026 imports. Subsequent declarations follow the same September 30 date each year. An EU CBAM guide published before October 2025 that cites May 31 as the deadline reflects the pre-Omnibus regulation and no longer applies.
The 4-month extension from May 31 to September 30 aligns the CBAM declaration timeline with the verifier registration window, which opens September 1, 2026 under the same Omnibus amendment. Importers sourcing from non-EU production installations have 13 months between verifier registration opening (September 1, 2026) and the first declaration deadline (September 30, 2027) to obtain verified embedded emissions data.
Change 2: Certificate Sales Start Moved from January 1, 2026 to February 1, 2027
CBAM certificate sales begin on February 1, 2027 (Regulation (EU) 2025/2083). The original Regulation (EU) 2023/956 had set certificate sales to commence January 1, 2026, the same date as the definitive phase start.
CBAM certificates are electronic instruments, each corresponding to one tonne of CO₂e embedded in imported goods, issued through the CBAM Registry operated by DG TAXUD and sold exclusively through the Common Central Platform. The Common Central Platform is a separate infrastructure currently in the procurement phase: the EU published the tender on February 16, 2026, with responses due April 6, 2026.
For 2026 imports, this means no certificate purchase is required during the year of import itself. The obligation to hold certificates (under the quarterly holding rule described in Change 4) begins once certificates become purchasable on February 1, 2027. Importers must then acquire and surrender sufficient CBAM certificates by September 30, 2027 to cover full-year 2026 embedded emissions. The quarterly certificate price in 2026 is calculated using the quarterly average of EU ETS auction clearing prices under Article 22(1a), inserted by Regulation (EU) 2025/2083.
For the full compliance workflow around CBAM certificates, including the surrender timeline and registry procedures, the dedicated CBAM certificates page covers the February 2027 certificate sales process in full.
Change 3: De Minimis Threshold Changed from €150 per Consignment to 50 Tonnes Annual Mass per Importer
The de minimis exemption under Regulation (EU) 2025/2083 is 50 tonnes of annual mass per importer per calendar year (Article 2(3a), as inserted by the Omnibus). The original threshold in Regulation (EU) 2023/956 was €150 per consignment, a customs value-based limit.
The 50-tonne threshold operates on an annual aggregate basis across all CBAM good types imported by a single legal entity. An importer who brings in 30 tonnes of steel products and 25 tonnes of cement products in the same calendar year totals 55 tonnes combined and falls above the threshold, with full CBAM obligations applying for the year. Two exclusions apply to the 50-tonne rule: electricity and hydrogen have no de minimis threshold regardless of import volume.
The shift from a per-consignment value test to an annual mass test changes compliance planning significantly. Under the €150 rule, a company splitting large shipments into smaller consignments could theoretically stay below the threshold per shipment. The annual aggregate approach closes this route by measuring the total mass imported by one legal entity across the entire year.
Change 4: Quarterly Holding Requirement Reduced from 80% to 50%
The quarterly holding requirement under Regulation (EU) 2025/2083 is at least 50% of the cumulative embedded emissions of CBAM goods imported since the start of the calendar year (Article 22(2), as amended). The pre-Omnibus rule required 80%.
The quarterly holding requirement applies at the end of each calendar quarter (March 31, June 30, September 30, December 31). An authorized declarant who has imported goods carrying 1,000 tonnes of CO₂e by the end of Q2 must hold at least 500 CBAM certificates in their CBAM Registry account by June 30. Certificate sales open February 1, 2027, which means this requirement is operative from the first quarter after certificates become available.
The reduction from 80% to 50% directly reduces the working capital cost of CBAM compliance during the year. At an EU ETS price of approximately €70/tCO₂ (Q1 2026 range: €66–90), an importer with 10,000 tCO₂e of quarterly cumulative emissions needed to hold certificates worth €560,000 at 80%, compared to €350,000 at 50%, a reduction of €210,000 in tied-up capital per quarter.
Change 5: Buyback Limit Increased from One-Third to 50% of Annual Purchases
The buyback limit under Regulation (EU) 2025/2083 is up to 50% of certificates purchased in a given calendar year (Article 23, as amended). The pre-Omnibus buyback limit was one-third (approximately 33%) of annual purchases.
Buyback is the right of an authorized declarant to resell surplus CBAM certificates back to the competent authority at the original purchase price, by October 31 of the surrender year. This mechanism protects importers who over-purchased certificates relative to actual import volumes, for example because a planned shipment was delayed or cancelled.
The increase from 33% to 50% doubles the effective hedge against import volume uncertainty. An importer who purchased 10,000 certificates in 2027 can now sell back up to 5,000 by October 31, 2027, compared to only 3,333 under the prior rule. Certificates not bought back by October 31 and not surrendered by September 30 of the following year are cancelled on November 1 each year (Article 24(1), as amended).
Change 6: Penalty for Authorized Declarants Harmonized at €100/tCO₂e
The penalty for authorized declarants who fail to surrender sufficient certificates under Regulation (EU) 2025/2083 is €100 per tonne CO₂e not covered (Article 26(1), as amended), inflation-adjusted from a base year. This rate is now uniform across all 27 EU member states.
Before the Omnibus, Regulation (EU) 2023/956 set a general penalty structure but left significant implementation discretion to national competent authorities, producing uneven enforcement across member states. The Omnibus harmonized the rate at €100/tCO₂e, the same penalty rate used under the EU Emissions Trading System for excess emissions.
The penalty is additive, not substitutive. Paying the €100/tCO₂e penalty does not extinguish the obligation to surrender the missing certificates. An authorized declarant who receives a penalty notice must still acquire and surrender the deficit certificates. The penalty compounds the financial cost of non-compliance at a rate of €100 per uncovered tonne on top of the certificate acquisition cost.
Change 7: Penalty for Unauthorized Importers Harmonized at €300–500/tCO₂e
The penalty for importing CBAM goods without authorization under Regulation (EU) 2025/2083 is €300–500 per tonne CO₂e (Article 26(2), as amended), representing a rate 3 to 5 times the standard authorized-declarant penalty. This rate applies to any person or entity that imports Annex I goods into the EU without having obtained authorized CBAM declarant status.
The €300–500 range gives national competent authorities discretion to set penalties within the band based on severity, duration, and degree of intentionality, while eliminating the prior situation where penalties varied arbitrarily between member states. Authorization applications for the definitive phase were due by March 31, 2026 for importers who wished to continue importing under provisional status while awaiting the authorization decision (Article 17(7a), inserted by Regulation (EU) 2025/2083).
Importers who missed the March 31, 2026 deadline and have continued importing CBAM goods without authorization face liability at the €300–500/tCO₂e rate from the date of unauthorized importation. At an EU ETS price of approximately €70/tCO₂ and a BF-BOF steel emission factor of 2.0 tCO₂ per tonne of product, unauthorized importation of 1,000 tonnes of blast furnace steel generates a penalty exposure of €600,000–1,000,000, before any certificate acquisition obligation.
How Regulation (EU) 2025/2083 Fits Into the CBAM Regulatory Framework
Regulation (EU) 2025/2083 does not stand alone. It amends Regulation (EU) 2023/956, which remains the primary legal instrument governing CBAM. Thirteen implementing and delegated regulations issued between 2023 and December 2025 define the operational detail of the mechanism, and 4 of those 13 were themselves amended to align with the Omnibus changes.
The 4 implementing regulations amended to reflect Omnibus changes are listed below.
- IR (EU) 2025/2549: Amends IR 2025/486 to align authorized declarant authorization procedures with Omnibus simplification
- IR (EU) 2025/2550: Amends IR 2024/3210 to update the CBAM Registry for the definitive phase, including certificate management and surrender modules
- IR (EU) 2025/2548: Establishes the quarterly average certificate price method for 2026 (as required by Article 22(1a) inserted by the Omnibus)
- IR (EU) 2025/2621: Establishes definitive phase default values, effective January 1, 2026, with mark-ups of 10% in 2026, 20% in 2027, and 30% from 2028 onward
The parent regulation being amended by the Omnibus, and the foundational legal architecture underlying all 7 parameter changes, is covered on the CBAM regulation page.
Caption: Regulation (EU) 2025/2083 amends Regulation (EU) 2023/956. Four of the thirteen implementing regulations were subsequently updated to align with the Omnibus changes.
What the 7 Omnibus Changes Mean for Compliance Planning in 2026 and 2027
All 7 changes introduced by Regulation (EU) 2025/2083 affect compliance timelines that run through 2026 and converge on the September 30, 2027 declaration deadline. Compliance planning built on pre-Omnibus values produces incorrect financial projections, incorrect authorization deadlines, and incorrect certificate holding schedules.
The revised key dates for CBAM compliance under the Omnibus are set out below.
- January 1, 2026: Definitive phase begins. Full financial obligations apply. Real-time customs validation of CBAM authorization.
- March 31, 2026: Deadline for provisional authorization applications under Article 17(7a).
- September 1, 2026: Verifier registration opens in the CBAM Registry.
- February 1, 2027: Certificate sales begin via the Common Central Platform.
- September 30, 2027: First annual CBAM declaration due. Full-year 2026 certificate surrender.
- October 31, 2027: Deadline to request buyback of excess 2027 certificates.
- November 1, 2027: Cancellation of unused certificates from prior periods.
For the complete CBAM compliance timeline, including all pre-Omnibus dates that have now changed and the replacement deadlines, the CBAM timeline page provides an indexed chronology of every key date.
The authorization deadline of March 31, 2026, the 120-day decision window under IR 2025/486 as amended by IR 2025/2549, and the financial exposure for importers who missed the provisional application window are covered on the CBAM authorized declarant page.
The September 30 deadline changed by the Omnibus is one of four content requirements for a valid annual declaration. Declaration content requirements, embedded emissions verification procedures, and the record-keeping obligation that runs through the end of the fourth year after the declaration year (approximately 4 to 5 years total under Article 6(6), as amended) are covered on the CBAM declaration page.
Frequently Asked Questions About Regulation (EU) 2025/2083
When did Regulation (EU) 2025/2083 enter into force?
Regulation (EU) 2025/2083 entered into force on October 17, 2025, the date of its publication in the Official Journal of the EU. The regulation was signed on October 8, 2025. All 7 parameter changes are in effect as of October 17, 2025 and apply to the definitive phase that began January 1, 2026.
Does the Omnibus change which sectors are covered by CBAM?
No. Regulation (EU) 2025/2083 does not change the 6 sectors covered by CBAM. The sectors listed in Annex I of Regulation (EU) 2023/956, including iron and steel, cement, aluminium, fertilizers, electricity, and hydrogen, remain unchanged. The proposed addition of approximately 180 downstream products from 2028 is a separate legislative proposal (COM(2025)989), pending ordinary legislative procedure approval, not part of the Omnibus.
Is the 50-tonne de minimis threshold calculated per shipment or per year?
The 50-tonne de minimis threshold is calculated per importer per calendar year in aggregate across all CBAM good types imported by that legal entity, excluding electricity and hydrogen which have no de minimis. An importer who exceeds 50 tonnes in aggregate annual imports of Annex I goods, from any combination of sectors such as steel and cement and aluminium, falls above the threshold and has full CBAM obligations for that year. The prior €150-per-consignment threshold, which applied per individual shipment, no longer applies.
Does the September 30, 2027 deadline also apply to declarations from 2027 onward?
Yes. The September 30 deadline established by the Omnibus amendment to Article 6 of Regulation (EU) 2023/956 is the annual declaration deadline for all years. The declaration covering calendar year 2026 imports is due September 30, 2027. The declaration covering calendar year 2027 imports is due September 30, 2028. Each declaration must cover the prior full calendar year.
What happens if an authorized declarant pays the €100/tCO₂e penalty but still has not surrendered certificates?
Payment of the €100/tCO₂e penalty under Article 26(1), as amended by Regulation (EU) 2025/2083, does not cancel the obligation to surrender the missing certificates. The penalty is additive to, not a substitute for, the certificate surrender requirement. An authorized declarant who receives a penalty notice must still acquire and surrender the deficit certificates in addition to paying the penalty fine.