CORSIA eligible programmes: which carbon standards qualify?
CORSIA eligible programmes explained: how ICAO approval works, why programme scope is not enough, and what buyers should check before relying on a unit.
CORSIA (Carbon Offsetting and Reduction Scheme for International Aviation) eligibility is not a blanket approval of every carbon credit in the market. ICAO (International Civil Aviation Organization) approves emissions unit programmes for defined scopes and compliance periods. Buyers need to check the current eligibility document, the project type, vintage, methodology and any restrictions before assuming a unit can be used.
Information only
This guide is for general information only. It is not legal, regulatory, procurement, investment, financial, tax or accounting advice. CORSIA eligibility documents, programme scopes, vintage limits, registry rules and Article 6 requirements can change. Check current ICAO documents, registry records and professional advice before relying on any eligibility view.
Quick answer
| Question | Short answer |
|---|---|
| Does an approved programme make every unit eligible? | No. Buyers still need to check the approved scope, vintage, methodology, project details and any conditions in the current ICAO document. |
| What is the common mistake? | Treating a familiar programme logo as proof that a specific unit can be used for a specific CORSIA compliance period. |
| Where should buyers go next? | Use the CORSIA eligible carbon credits guide for unit-level checks and the CORSIA credit prices guide for price and supply risks. |
What are CORSIA eligible programmes?
CORSIA eligible programmes are carbon crediting programmes that ICAO has approved for use in the Carbon Offsetting and Reduction Scheme for International Aviation. Approval is based on CORSIA emissions unit eligibility criteria and advice from ICAO's Technical Advisory Body.
The important phrase is “programme and scope”. A programme may be approved only for certain unit types, vintages, activities or compliance periods. That means buyers cannot stop at the programme logo. They must read the eligibility details.
How ICAO approval works
Carbon crediting programmes apply to ICAO for assessment. The Technical Advisory Body reviews them against CORSIA eligibility criteria. ICAO then publishes eligible programmes and the detailed conditions that apply. The document is updated over time, so buyers should check the current version before procurement.
Programme approval looks at governance, transparency, additionality, baselines, monitoring, permanence, leakage, double counting and other carbon integrity issues. That still does not eliminate project-level due diligence. It means the programme has met CORSIA's requirements for a defined scope.
Examples of programme-level checks
A buyer should treat the ICAO eligibility document as the control document. It is not enough to rely on a broker's summary or a project page. Programme-level approval may include notes about eligible unit dates, activity exclusions, methodology limits or requirements for avoiding double counting.
| Document check | What it tells you | Why it matters |
|---|---|---|
| Programme approval | Whether the crediting programme is accepted for a compliance period. | Only approved programmes can supply usable units. |
| Vintage limits | Which reduction years may qualify. | A credit outside the date range may not be usable. |
| Activity exclusions | Whether certain project types or methodologies are excluded. | Eligibility can be narrower than the programme's full project list. |
| Double-counting treatment | Whether host-country authorisation or accounting evidence is needed. | International use can raise Article 6 and claim integrity questions. |
Why scope limitations matter
Scope limitations are where many mistakes happen. A credit may be from an approved programme but still fail eligibility because the vintage, methodology, unit type or host country treatment falls outside the approved scope. For CORSIA, “approved programme” is only the beginning of the check.
| Check | Why it matters |
|---|---|
| Compliance period | A unit may be eligible for one CORSIA phase but not another. |
| Vintage | Eligibility may depend on when the emissions reduction occurred. |
| Methodology | Some methodologies may be excluded or limited. |
| Corresponding adjustment | Some claims may require host-country accounting treatment. |
| Cancellation rules | Units must be cancelled correctly for CORSIA compliance. |
Programme eligibility is not a quality guarantee
CORSIA eligibility is meaningful, but it is not the same as saying every individual project is equally strong. A buyer should still ask whether the baseline is credible, the project is additional, monitoring is robust, leakage is addressed, and local impacts are understood.
Airlines also face reputational risk. A unit can be technically eligible yet still attract criticism if the underlying project is controversial. The more public the claim, the more careful the buyer should be.
Buyer due diligence checklist
- Download the latest ICAO CORSIA Eligible Emissions Units document.
- Confirm the programme is eligible for the relevant compliance period.
- Check vintage, methodology and activity-type limits.
- Confirm whether corresponding adjustments are required for the intended claim.
- Review project documentation and verification history.
- Check registry serial numbers before purchase and cancellation evidence after use.
Who needs the eligibility file?
The eligibility file is not just for the airline compliance team. Brokers, project developers, corporate buyers and advisers may all need a clean evidence trail if a unit is being discussed as eligible under CORSIA. The file should show the programme approval, the permitted scope, the vintage, the methodology, the project identity, the registry serial numbers and the intended use case.
For an airline, the file reduces compliance risk before procurement. For a broker, it reduces the risk of selling a unit into the wrong use case. For a project developer, it helps avoid overstating eligibility in marketing material. For a corporate buyer, it helps distinguish between a credit that is eligible for aviation compliance and a credit that is simply from a familiar voluntary carbon programme.
A practical file does not need to be complicated. It needs to be dated, source-backed and specific to the units being bought. The weakest evidence files usually rely on a programme name alone. The strongest ones show exactly why this project, this vintage and this cancellation pathway fit the relevant CORSIA requirement.
Common buyer mistakes
- Assuming a logo equals eligibility: a programme logo does not prove the specific unit qualifies.
- Ignoring vintages: an otherwise credible unit can fall outside the approved vintage window.
- Checking eligibility too late: eligibility should be checked before purchase, not after a procurement deadline.
- Confusing voluntary quality labels with CORSIA eligibility: other integrity labels can be useful, but they do not replace ICAO's requirements.
- Weak cancellation evidence: the final compliance record should show what was cancelled and for what purpose.
Where this fits in the wider carbon market
CORSIA creates a bridge between aviation compliance and the voluntary carbon market. Many units originate from programmes used by voluntary buyers, but CORSIA adds an aviation-specific eligibility layer. That can increase demand for certain units and exclude others from compliance use.
For project developers, eligibility can be commercially valuable. For buyers, it is a filter. For the market, it may gradually reward better documentation, clearer registry treatment and stronger programme governance.
Programme eligibility is therefore one layer in a wider CORSIA check. Buyers should also read the CORSIA eligible carbon credits guide, the CORSIA credit prices guide, the carbon credit quality checklist and the carbon credit retirement evidence guide. Programme approval can tell a buyer whether a category of units can be used, but the project-level review tells them whether those units are credible enough for procurement and public disclosure.
That distinction matters for brokers and developers as well. A project can sit under a programme with CORSIA eligibility and still need clean registry evidence, vintage information, methodology documentation, host-country treatment and cancellation records. The sales claim should therefore be specific: eligible programme, eligible scope, eligible vintage and eligible use case.
Bottom line
CORSIA programme approval is a starting point, not the finish line. Buyers still need to confirm the exact period, vintage, methodology, scope limitation, Article 6 treatment and cancellation evidence before relying on a unit.
CORSIA eligible programmes FAQ
Does programme approval cover every project?
No. Approval can be limited by compliance period, unit type, methodology, vintage or other restrictions. Buyers must check the detailed ICAO eligibility document.
Is CORSIA eligibility the same as ICVCM (Integrity Council for the Voluntary Carbon Market) CCP (Core Carbon Principle) approval?
No. They are separate integrity and eligibility frameworks. A buyer may consider both, but one label does not automatically replace the other.
What should brokers provide?
Brokers should provide eligibility evidence, registry details, serial numbers, project documentation, vintage, methodology and any Article 6 or corresponding adjustment documentation relevant to the claim.