Carbon Credit Inventory Is Now a Treasury Function

Companies retired 202 million tonnes of carbon credits in 2025, matching the record set in 2021, while durable removal buyers signed contracts for another 30.4 million tonnes that have mostly not been delivered yet (MSCI, CDR.fyi). Together they describe something a treasurer would recognise: spot inventory, a forward book, and an obligation that accrues every year. Until recently that position lived in a sustainability report. It is now moving onto the balance sheet, and the digital capital markets question is whether the data behind it can support a mark an auditor will sign.

The position already exists; the ledger for it does not

Most large corporates already hold three distinct carbon exposures. There are credits sitting in registry accounts, bought and not yet retired. There are forward purchase agreements for removal tonnes that will be delivered over five to fifteen years. And there is the obligation itself, which grows with every tonne emitted against a public target. More than 12,000 companies now have a committed or approved Science Based Targets initiative target, and around 1,300 have committed to carbon neutrality by 2030 or earlier, according to the same MSCI review.

The forward book is where the mismatch is starkest. Durable removal contracts grew roughly 299% year on year in 2025, yet cumulative deliveries across the sector only crossed one million tonnes (CDR.fyi). A single buyer accounts for close to 80% of all durable removal ever contracted. That is a market where the typical corporate position is a claim on future delivery from a small number of suppliers, not a stock of credits on hand. Delivery risk, counterparty concentration and price basis between what was contracted and what spot costs at retirement are treasury risks, whatever department currently owns the spreadsheet.

The existing infrastructure was built for a different purpose. Registries record issuance, transfer and retirement. They were never designed to tell a CFO what a portfolio is worth today or how much of next year's obligation is already funded. The missing settlement and data layer is described in the missing rails for carbon markets.

What changes when the auditor asks

In May 2026 the Financial Accounting Standards Board issued ASU 2026-02, its first dedicated guidance on environmental credits and environmental credit obligations (Deloitte summary). Credits are recorded at cost. Credits held for non-compliance purposes, which covers most voluntary net-zero inventory, are tested for impairment every reporting period. The obligation is recognised when the emitting activity happens, not when credits are retired against it. And that obligation is measured in three parts: the funded portion at the cost of credits on hand, firm commitments at contract cost, and the unfunded remainder at the fair value of the credits needed to settle it.

Public companies apply this for annual periods beginning after December 15, 2027. Disclosures will cover how credits were obtained, what they are intended for, the measurement methods used, settlement timing and the significant judgements involved. The IASB has deferred its own project on pollutant pricing mechanisms (IFRS), so the frameworks are not yet aligned, but the direction is set.

Impairment testing every period is the operationally hard part. It requires a defensible price for each lot of credits, and carbon is not one price. The MSCI Global Carbon Credit Price Index averaged about $3.5 per tonne in 2025, while the index of credits rated BBB and above rose from $5.6 to $6.8, and the spread between the two had widened to more than $7 by year-end, a premium of roughly 360% for higher-rated supply (MSCI). Credits carrying the Integrity Council's Core Carbon Principles label have held an average premium of about 19% since mid-2024 and made up around 15% of new issuance in the first half of 2026 (ICVCM). A treasury that cannot mark inventory by rating, label, methodology and vintage cannot pass an impairment test cleanly. It will end up writing everything down to the low-quality average, or defending a mark it cannot evidence.

Marking a position needs verifiable data, not a PDF

The value case for better carbon data was always framed around integrity. Accounting turns it into a cost case. Every quarter, someone has to reconcile registry holdings to the general ledger, assign a price to each lot, confirm which forward contracts have delivered and which have slipped, and evidence retirements against the year's obligation. Done by hand across several registries with different data models, that is weeks of work and a material audit exposure.

The information a treasury needs is specific:

This is exactly the shape of data that on-chain registers and oracle-verified attestations produce as a by-product of operating. A holding recorded on a shared ledger reconciles itself. An attestation that the credits backing a position actually sit in the registry account, refreshed continuously rather than confirmed once a year, is the carbon equivalent of the reserve verification described in what proof of reserve means for real-world assets. It is audit hours, restatement risk and the ability to move or pledge a lot with settlement measured in minutes rather than the weeks a registry transfer and a wire currently take.

Procurement becomes a funding decision

Once the position is on the balance sheet, the decision about how to acquire credits stops being a sustainability choice and becomes a funding choice with three broad options. A company can prepay removal through offtake agreements, buying price certainty and supply at the cost of cash out the door years before delivery and concentrated counterparty risk. It can hold spot inventory, which is simpler but ties up capital and creates impairment exposure every quarter. Or it can buy at retirement, which keeps cash free and accepts full exposure to a spot price that, for high-rated credits, rose more than 20% last year.

Each option lands differently under the new measurement rules. Prepaid offtakes become firm commitments measured at contract cost. Spot lots become inventory at cost with a quarterly impairment test. Deferred buying leaves the obligation unfunded and marked at fair value, which is the most volatile line of the three. Treasuries will mix these deliberately, the way they already ladder debt maturities.

The capital-markets consequence is that carbon inventory and forward books start to look like assets that can be held in structured vehicles, pooled, verified and transferred under defined rules, rather than line items trapped in a registry account. Companies that already hold credits are starting to ask how a pooled inventory should be structured. The mechanics of that structure, starting from the registry account rather than the token, are set out in how to tokenize carbon credits you already hold. Any interest in such a vehicle is a security, offered under an exemption determined by counsel, through documents counsel prepares. What the market needs from infrastructure is the data layer that makes those interests verifiable enough to hold, mark and audit.

What a treasury-grade carbon book looks like

The companies that will handle 2028 reporting without a scramble are building five things now. A single consolidated register across every registry they hold credits in. A written mark policy that prices by rating, label and vintage, not by a market average. Continuous monitoring of the forward book, with delivery data pulled from suppliers on a schedule rather than requested at year-end. Retirement evidence linked to serial numbers and reporting periods. And a custody and continuity plan for the registry accounts themselves, since a lost login is now a lost asset.

Commertize's view as a digital capital markets platform is that carbon will follow the path gold and treasuries have already taken: once a position has to be marked and audited, the market that supplies verifiable holdings data and fast settlement wins the inventory. The voluntary market's primary value has been flat at roughly $1.4 billion for four years. The premium for verifiable quality has not been flat at all, and that is where the next phase of growth sits.

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