Draft EU CBAM Carbon Price Deduction Rules

Your supplier may already pay a carbon price at home. The obvious question is whether that payment reduces the number of CBAM certificates you have to surrender.

A draft Commission implementing regulation, Ares(2026)4841230, sets out how it could. The draft is detailed enough to prepare against, but every operative point below stays proposed until an adopted act appears in the Official Journal.

The legal basis is Article 9(5) of Regulation (EU) 2023/956. The purpose is to stop the same emissions being charged twice. In return, the draft would require a traceable link between the foreign payment, the embedded emissionsEmbedded emissionsThe greenhouse-gas emissions released producing a good — direct emissions plus, where applicable, indirect (electricity) emissions — expressed per tonne of good; electricity uses kWh legally and may be converted to MWh operationally. This i and the goods you import.

Your emissions data would decide which route you get

Under the draft, goods reported with actual embedded emissions would give the declarant a choice. You could use a certified effectively paid carbon price, or a Commission default carbon price.

Goods reported with default embedded emissions would have no choice. Only the Commission default-carbon-price route would be open.

The draft would also let direct emissions, applicable indirect emissions and precursorPrecursorUpstream CBAM good consumed as input to a complex-good process; listed per route; quantities always monitored per Annex II pt E. emissions be handled separately, across different mechanisms and different jurisdictions. Supplier-specific precursor prices would be quantity-weighted before they are attributed to complex goods.

The check to run now: identify which installations can support certified payment data, and where Commission defaults may be needed instead.

Only the price actually paid would count

The draft would treat several mechanisms as eligible: a carbon tax, levy or fee; an emissions trading system; a baseline-and-credit system; certain fuel carbon-content charges; and authorised compliance credits. Only the part attributable to CBAM-relevant embedded emissions would count.

Two systems rarely draw their boundaries in the same place, so the draft permits a boundary difference of up to 5% between the foreign mechanism and the CBAM system boundariesSystem BoundariesThe incorporated UK document defining which production processes and emissions belong in the UK CBAM calculation boundary.. It would also recognise qualifying international credits authorised or issued under Article 6(2) or Article 6(4) of the Paris Agreement, capped at 10% of reported and confirmed mechanism emissions.

Anything that returns the money reduces the price. Free allowances, thresholds, exemptions, reduced rates, refunds, rebates and monetary compensation would all cut the effective price under the draft. Indirect-cost compensation for electricity carbon costs would be considered as well. One proposed carve-out covers certain publicly available decarbonisation support funded from carbon-price revenue.

The evidence would have to connect the payment to the goods

The draft asks the operator for an electronic report. It would identify the carbon-pricing mechanism and its legal basis, the covered emissions, the prices, the allowances or credits surrendered, the payment evidence, rebates and compensation, the goods and precursor allocation, and the currency conversion.

Foreign currency would be converted at the official yearly average exchange rate for the reporting periodReporting periodDefault = calendar year of the producing installation; 2026 imports legally fixed to reporting period 2026; alternative ≥3 consecutive representative months; no pre-2026 period. Workbook sheet 5x offers Calendar/Financial/Custom.. The certificate reduction would then be calculated against a yearly CBAM-certificate reference price, derived from certificate prices for the import year.

One proposed rule deserves attention from finance teams. If an operator is entitled to compensation but cannot evidence the amount, the draft says the report cannot establish a certifiable effective price. That proposition is not yet law. It does show why compensation evidence has to be mapped alongside tax records and allowance-payment records, rather than after them.

Certification would be a separate assurance exercise

The draft would create an accreditation activity group for carbon-price certification. A verifierVerifierAccredited independent third party confirming the SEE is free of material misstatement; any EU or third-country legal person; only values in a verification report count for actuals. Importers receiving "verification reports" from third part who already checks embedded emissions could do this work too, if appropriately accredited and independent.

The proposed conclusion is reasonable assuranceReasonable assuranceThe assurance level of CBAM verification statements (workbook "Engagement type" dropdown also offers "Limited assurance" — CBAM verification itself is reasonable-assurance). at 5% materiality, in draft Annex IV. The text also covers site visits, competence, independence and how far this work may rely on emissions verification. A Registry-generated certification report is envisaged from 1 January 2027 — a date proposed in the draft, not an adopted deadline.

What to do now: build the evidence chain, not the calculation

Start with the evidence, because the evidence is the slow part. Declarants can inventory the mechanisms, payments, rebates, compensation, credits, FX records and precursor data. Operators can then test whether those records connect cleanly to specific goods and specific reporting periods.

Do not run a final certificate-reduction calculation yet. Every threshold, form and accreditation rule described here can still move, so compare the adopted act with this draft before relying on any of them. The right action today is an evidence-gap review and an adoption watch.

Source note: This article is derived solely from the official EUR-Lex draft linked below, with a research cutoff of 16 July 2026. Recheck EUR-Lex and the Official Journal before publication or operational reliance.