On 13 May 2026 the EU published draft rules for deducting carbon prices paid outside the bloc from CBAM bills. For Canadian operators the draft giveth and the fine print taketh away — what counts, what gets netted out, and what to file before the rules harden.
Article 9 of the CBAM regulation has always promised that a carbon price paid in the country of origin reduces the number of certificates an EU importer must surrender. What it never specified was how — and for three years that gap made the promise unbankable. On 13 May 2026 the European Commission published the draft implementing regulation that fills it, opening a four-week consultation that closes 10 June 2026, with adoption expected later this year.
The architecture follows the Omnibus framework adopted in October 2025, and every element of it rewards operators who start assembling evidence now rather than after adoption.
What this rulemaking confirms
The draft confirms that carbon prices paid under any form of mandatory carbon tax, levy, or emissions trading system in the country of origin are eligible for deduction from CBAM obligations. For Canadian facilities operating under the federal OBPS or provincial equivalents, this means the compliance cost actually borne — not the headline price — can be credited against the EU’s border levy, provided the evidence trail is assembled installation by installation.
The draft recognizes a carbon price in the form of a tax, levy or fee, or the compliance cost of an emissions trading system, provided the mechanism is mandatory, applies to operators in the sector without discrimination, and is actually borne by the installation producing the goods. Voluntary internal carbon prices do not count; neither do offset purchases made outside a compliance obligation. International credits under Article 6 of the Paris Agreement can count only where the origin country’s own scheme accepts them, and only up to 10 percent of the installation’s covered emissions — anything above the cap is treated as a price of zero.
Canada’s industrial systems — the federal OBPS and its provincial equivalents — are compliance carbon pricing in exactly this sense. Eligibility is not the Canadian problem. The Canadian problem is the next section.
The draft deducts the carbon price effectively paid — whatever the installation actually spent on carbon compliance, net of every rebate, free allocation, exemption, reduced rate, refund or compensation that lowered the real burden. This is where the structure of Canadian carbon pricing matters.
Canada’s output-based pricing systems are intensity-based: a facility’s obligation is determined by the gap between its actual emissions intensity and a performance benchmark, multiplied by its production. What the facility actually pays depends on several factors. A portion of the obligation may be settled by payment into the compliance fund at the headline carbon price. But facilities also purchase compliance credits from companies that outperform their benchmarks — and those credits typically trade at a discount to the headline price. The mix of fund payments at the headline rate and credit purchases at market price, combined with the benchmark allocation, determines the effective price per tonne for each installation.
Quebec’s cap-and-trade system under the Western Climate Initiative is the only Canadian provincial program with a design similar to the EU ETS — allowances are auctioned and traded, and the cost per tonne is set by market clearing prices rather than a fixed headline rate. The effective price there is the weighted average of auction settlement and secondary market purchases, net of any free allocation the facility received.
Across all Canadian systems, the effective price per tonne is typically well below the headline carbon price. Illustratively: a facility under the federal OBPS whose benchmark covers 80 percent of its emissions pays only on the remaining 20 percent — an average effective price near C$19 per tonne, roughly €13, against a Q1 2026 certificate price of €75.36. The same netting logic the EU applies to its own producers’ free allocation is being applied, symmetrically, to everyone else’s.
One genuine carve-out
Carbon revenue recycled into decarbonization support does not count as compensation — if the support is generally available, public, and aimed at emissions reduction. Canadian programs funded from carbon proceeds may survive the netting where targeted rebates would not.
Two design features sharpen the point. Where embedded emissions are declared using default values, the deduction must also use default carbon prices; and for indirect emissions the default-price route is the only one available. Actual deduction claims and actual emissions data travel together — you cannot mix a verified carbon-price file with defaulted emissions.
The draft offers claimants the same choice CBAM offers on emissions:
| Track | How it works | What it demands |
|---|---|---|
| Actual effective price | Installation-specific carbon price report in a standard electronic format, in English, certified at reasonable assurance by an independent certifier accredited by a national accreditation body | Four-year record-keeping; 5% materiality threshold on the effective price; certification reports flow through the CBAM Registry from 1 January 2027; precursor installations need their own certified reports |
| Default carbon price | Commission-published default price per country, available from 2027 in the Registry | Less paperwork, calibrated conservatively — and mandatory where emissions themselves are defaulted |
The certifier may be the same accredited person who verifies the installation’s emissions report, which argues for engaging one provider for both files. A prescribed formula then converts the certified effective price into a certificate reduction against the yearly CBAM reference price, with set currency-conversion rules .
Climate Decode builds the installation-level carbon-price evidence file — obligations, benchmarks, credit purchases, fund payments, and certification — alongside the emissions data required for each CBAM declaration.
The deduction lands on a Canadian pricing landscape that moved twice in fourteen months. The consumer fuel charge went to zero on 1 April 2025. Then, on 15 May 2026, following the federal–Alberta memorandum, Ottawa reset the industrial trajectory: the 2026 headline price holds at C$95, reaching C$100 in 2027 and C$130 by 2035 — replacing the old path that would have hit C$170 by 2030. Beneath the federal benchmark sits the patchwork the EU will actually evaluate: Alberta’s TIER, Ontario’s EPS, Quebec’s cap-and-trade (auction floor near C$26.47), British Columbia’s OBPS, the federal backstop elsewhere — and Saskatchewan’s rate zeroed since April 2025.
Three consequences follow. Effective prices now differ by province, by system, and by facility — there is no single “Canadian carbon price” to deduct, only installation-level facts. Credit-market prices add another layer: where compliance is met with credits trading below the headline (Alberta credits have swung from under $15 to over $40), the effectively-paid number moves with the market. And no Canada–EU equivalency arrangement exists to shortcut any of this. Canada is considering its own border carbon adjustment mechanism, but recognition of Canadian pricing under CBAM currently runs through this implementing regulation and each operator’s installation-level file.
The strategic read
A higher, harder Canadian effective price would mean larger EU deductions and a stronger sovereignty argument for industrial pricing. The May 2026 softening cuts the other way: less carbon cost at home, less to deduct at the border, more of the levy collected by Brussels instead of Ottawa or the provinces.
CBAM is the EU importer’s obligation — the importer surrenders certificates and files the declaration. But the cost flows upstream: facilities that cannot demonstrate a low effective carbon price face higher import invoices from their EU customers, as importers pass through the CBAM certificate cost. Canadian producers exporting to the EU should therefore treat CBAM preparation as their own commercial priority.
Quantify embedded emissions per CBAM boundaries. Emissions must be calculated using CBAM’s project boundary definitions and emission factors, not domestic reporting conventions. The CBAM boundary may include process emissions, combustion emissions, and indirect emissions that differ from what Canadian compliance programs require.
Follow CBAM calculation methodology for certificate requirements. The number of certificates the EU importer must surrender is determined by the embedded emissions per tonne of product, multiplied by the volume imported, minus any deduction for carbon prices paid at origin. Understanding this formula is essential for pricing and contract negotiations.
Identify areas to reduce emissions intensity. Lower embedded emissions reduce CBAM exposure and local carbon market compliance costs simultaneously. Facilities should assess where operational or process improvements can reduce their emissions intensity per tonne of product — every tonne avoided reduces the CBAM bill at the border and the compliance obligation at home.
Assemble the carbon-price evidence file. Reconstruct the obligation trail per installation: compliance obligations, benchmark allocations, credits used, fund payments, true-ups — the four-year record the certifier will test. Line up certification with the emissions verifier against the 1 January 2027 registry start.
Model both deduction tracks. If the Commission’s default carbon price for Canada lands above the certified actual effective price, the default claim may be the simpler route. Run the comparison before the importer asks.
This paper closes the loop the series opened: Paper 1 mapped which Canadian tonnes face the border; Paper 2 set out the data machinery; Paper 3 showed the producers converting intensity into position. The deduction is where all three meet: verified emissions, documented carbon costs, and a border price that nets them against each other.
TerraNova assembles the whole file in one workspace — embedded emissions to CBAM methodology, the carbon-price evidence trail, certification handoff, and the abatement plan that improves both numbers at once.
Climate Decode prepares the deduction file Canadian operators will need the day the implementing regulation is adopted — evidence first, formula second.
Notes and sources for the figures in this paper.