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CORSIA credit prices in 2026: why eligible units may cost more

CORSIA (Carbon Offsetting and Reduction Scheme for International Aviation) credit prices are not a single market ticker.

Kieran Simpson 22 May 2026 Updated 3 Jul 2026

CORSIA (Carbon Offsetting and Reduction Scheme for International Aviation) credit prices are not a single market ticker. The real question in 2026 is whether a unit is eligible for the right CORSIA phase, whether its programme and vintage fit the latest International Civil Aviation Organization (ICAO) documents, and whether the evidence file is strong enough for aviation compliance.

Information only

This guide is for general information only. It is not legal, regulatory, procurement, investment, financial, tax or accounting advice. CORSIA eligibility, Article 6 treatment, credit supply, broker quotes and compliance deadlines can change. Airlines, intermediaries and buyers should check current ICAO documents, registry records and professional advice before relying on any price or eligibility view.

Data checked

Data checked 21 June 2026 against ICAO's CORSIA Eligible Emissions Units page, the April 2026 CORSIA Eligible Emissions Units document and ICAO's April 2026 informal eligibility summary table. Market prices are not official ICAO prices and should be treated as indicative unless backed by dated transaction or quote evidence.

Quick answer

Question	Short answer
Is there an official CORSIA credit price?	No. ICAO sets eligibility rules. Prices form in private and brokered carbon markets.
Why do CORSIA eligible units price differently?	Eligibility narrows the usable supply pool, while project type, vintage, Article 6 evidence and buyer timing still matter.
Why do people search for 2025 prices?	2025 sits inside CORSIA's 2024-2026 first phase, so buyers are usually asking about first-phase eligible supply.
What is the biggest procurement risk?	Buying a credit that is cheap, but not usable for the relevant compliance period or not backed by a clean evidence file.

The price question looks simple: what does a CORSIA credit cost? The useful answer is more demanding. CORSIA is not a generic offset market. It is an aviation compliance system that recognises only eligible emissions units for defined compliance periods and scopes.

That changes how the price should be read. A low quote for a voluntary credit may be irrelevant if the unit is outside the approved programme scope, has the wrong vintage, lacks host-country treatment where required, or cannot be cancelled correctly for CORSIA. A higher quote may be more defensible if it comes with stronger eligibility evidence, registry clarity and lower public-claim risk.

What is a CORSIA credit price?

A CORSIA credit price is the market price for an emissions unit that a buyer believes can be used toward a CORSIA offsetting obligation. ICAO does not publish a fixed price. It publishes eligibility documents that explain which programmes, periods, vintages and conditions can supply CORSIA eligible emissions units.

That means the price is attached to a unit type and a use case, not just a tonne of carbon dioxide equivalent. A quote should tell the buyer what programme issued the unit, what vintage it is, what project or activity produced it, which registry holds it, which CORSIA compliance period it is being sold for, and what conditions apply.

The practical distinction is important. A carbon credit can be real under a voluntary programme and still not be usable for CORSIA. A unit can come from an approved programme and still fall outside the approved scope. For airlines, the price only becomes meaningful once the eligibility file is clear.

The numbers to know in 2026

Item	Current position	Why it matters for price
Current ICAO document edition	April 2026	The latest document is the control point for programme scope and eligibility conditions.
Pilot phase	2021-2023	Older eligible-unit windows do not automatically answer first-phase procurement questions.
First phase	2024-2026	This is the phase behind many current 2025 and 2026 price searches.
Second phase	2027-2029	Forward-looking buyers need to separate current eligibility from future supply expectations.
Host-country treatment	Units with vintages from 2021 onward have specific host-Party attestation requirements in the ICAO summary table.	Article 6 evidence can affect scarcity, delivery risk and the premium attached to usable supply.

The current ICAO summary table is especially useful because it shows why a single price is weak evidence. Some programme rows cover 2021-2026 units. Some are conditional. Some apply only to earlier periods. Several have notes and exclusions that need to be checked in the full ICAO document.

Why there is no single official price

CORSIA sets the eligibility filter. It does not run a central exchange for eligible emissions units. Prices can appear through brokers, bilateral deals, procurement events, market data providers, exchanges, forwards or project-level negotiations. Those prices may not describe the same thing.

A buyer comparing two quotes needs to ask whether the units are really comparable. A 2021-2026 eligible unit with a clean registry file is not the same as a generic voluntary credit. A removal credit is not the same as an avoidance credit. A unit with unresolved host-country documentation is not the same as one that has the evidence needed for the intended claim.

This is why published CORSIA price figures should be treated as context rather than as a buying signal. A price range can help readers understand the direction of the market, but the procurement decision depends on eligibility, quality, delivery and claim risk.

What drives CORSIA eligible credit prices?

Driver	How it affects price	Buyer check
Eligibility scope	Narrower eligibility can reduce usable supply and support a premium.	Does the exact unit fit the current ICAO document for the relevant compliance period?
Vintage	Different vintage windows can change whether a unit is usable and how buyers value it.	Does the reduction year sit inside the approved window?
Programme approval	Programme approval may be full, conditional or limited by scope.	Is the programme approved for this phase, with no condition that blocks the unit?
Article 6 and host-country evidence	Authorisation and attestation requirements can create scarcity and delivery risk.	What host-country documentation is required, and has it been provided?
Project quality	Higher-integrity projects can price differently even when both units are technically eligible.	Are baseline, additionality, monitoring, permanence and safeguards defensible?
Timing	Demand can become lumpy as compliance deadlines approach.	Is procurement early enough to avoid accepting weak documentation under time pressure?

Why eligible units may cost more than ordinary voluntary credits

A voluntary carbon credit can be useful for a corporate contribution or offsetting strategy, but that does not make it eligible under CORSIA. CORSIA adds an aviation-specific filter. That filter can make usable supply scarcer, especially when airlines need units for a defined phase and sellers need to prove programme scope, vintage, registry treatment and host-country evidence.

The premium is not automatic. If buyer demand is weak or eligible supply is abundant, eligibility alone may not create a large price difference. If many airlines need a limited pool of well-documented units, the same eligibility filter can become commercially important.

The stronger way to think about price is therefore not "eligible equals expensive." It is "eligible narrows the market." Once the market is narrower, ordinary quality and scarcity factors still decide the result.

How Article 6 changes the price question

CORSIA sits close to Article 6 because international aviation offsetting needs credible accounting. If a credit is used by an airline and also counted by the host country toward its own climate target, the environmental claim becomes weaker. That is why host-country authorisation, attestations and corresponding-adjustment treatment can matter.

For price, this creates a bottleneck. Project developers may have credits, but airlines need credits with the right eligibility and accounting evidence. Host countries may support Article 6 cooperation, but their domestic systems may still need authorisation procedures, registries and reporting capacity. A unit with a clean Article 6-linked evidence trail may therefore be more valuable than a similar unit without it.

This does not mean every airline procurement decision should chase the most expensive unit. It means the buyer should know what the price is paying for: eligibility, delivery certainty, credit quality, host-country treatment, reputational resilience or simply limited supply.

The evidence file matters as much as the quote

Evidence	What it proves	Why it protects the buyer
ICAO eligibility check	The programme, period and scope are relevant to CORSIA.	Stops a generic voluntary unit being mis-sold as aviation-compliance supply.
Registry record	The unit exists, has an issuer, serial number and status.	Supports audit, delivery and cancellation checks.
Vintage and methodology	The reduction year and activity type fit the approved scope.	Identifies units that fall outside the permitted window or activity category.
Host-country evidence	The relevant authorisation or attestation requirement has been considered.	Reduces double-counting and Article 6 accounting risk.
Cancellation record	The unit was cancelled for the intended purpose.	Creates the final compliance trail.

A price spreadsheet without this evidence is not a procurement file. It is a quote list. For CORSIA, the file should show why the unit is usable, not only what it costs.

Indicative price context

The carbon market contains several price signals: regulated allowance prices, voluntary credit prices, durable carbon removal prices, internal carbon prices and CORSIA eligible unit prices. They should not be blended into one average. A tonne under one rulebook can carry a very different claim, delivery and compliance value from a tonne under another.

Use any published CORSIA price range with caution. Ask whether the range covers spot units or forward delivery, whether it includes broker fees, whether the units are first-phase eligible, whether the quote assumes Article 6 evidence, and whether it reflects actual trades or asking prices.

Indicative carbon market context via The Carbon Workbench

How airlines should compare quotes

The first rule is to compare like with like. A low-cost avoidance credit should not be compared directly with a durable removal credit. A unit eligible for an earlier CORSIA period should not be treated as equivalent to a first-phase unit. A quote without host-country documentation should not be compared with one that includes the relevant evidence trail.

The second rule is to separate price from risk. A cheaper unit can be rational if it is eligible, well documented and appropriate for the buyer's claim. It can be expensive in practice if it later fails eligibility, attracts controversy, cannot be delivered or needs to be replaced near a deadline.

The third rule is to document the reason for the purchase. If a buyer chooses a higher-priced unit because it has cleaner Article 6 evidence or stronger project documentation, that rationale should be recorded. If a buyer rejects a cheaper unit because the eligibility file is weak, that should also be recorded.

What non-airline buyers can learn from CORSIA

Companies outside aviation do not usually need CORSIA units, but the discipline is useful for ESG (environmental, social and governance) teams, procurement teams and finance teams reviewing carbon-credit claims. CORSIA forces the buyer to ask a specific question: can this unit support this exact use case under this rulebook?

That habit is valuable in the voluntary carbon market too. A credit used for a climate contribution claim may not need the same evidence as a credit used for a neutrality claim. A credit used in an investor-facing transition plan may need different documentation from a credit used for internal carbon budgeting. The buyer should define the claim first, then buy the unit that fits it.

CORSIA credit prices FAQ

Is there an official CORSIA carbon price?

No. CORSIA sets eligibility rules, not a fixed unit price. Market prices vary by programme, vintage, project type, quality, Article 6 evidence, delivery terms and timing.

Why do CORSIA eligible credits sometimes cost more?

Eligibility can narrow the supply pool and create aviation-specific demand. A premium is more likely when eligible supply is limited, documentation is strong and buyers face a compliance deadline.

Are 2025 CORSIA prices different from 2026 prices?

Both years sit inside the 2024-2026 first phase, but market conditions can change. A dated quote from 2025 should not be treated as a current 2026 price without checking availability, eligibility and delivery terms.

Can an airline use any voluntary carbon credit?

No. The unit must fit the current CORSIA eligibility requirements for the relevant period and use case. A voluntary credit can be credible and still be unusable for CORSIA.

Should airlines wait until the last minute to buy?

Late procurement can create price, delivery and documentation risk. Airlines generally need enough time to check eligibility, compare unit types, review evidence and secure cancellation records.

Bottom line

CORSIA credit prices are best read as a compliance-quality signal, not only a cost-per-tonne number. The cheapest quote can be the wrong quote if the unit does not fit the relevant CORSIA phase or lacks the evidence needed for aviation compliance. A more useful question is: what exactly is this price buying, and can the buyer prove the unit is usable?

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