CORSIA Carbon Credits: Essential Guide to Aviation's Offsetting Scheme
Airlines around the world now face a new requirement to offset their carbon emissions from international flights. CORSIA carbon credits are special carbon offsets that airlines must purchase to compensate for emissions above 2019 levels on international routes between participating countries. This global program started in 2024 and affects over 126 countries.
The Carbon Offsetting and Reduction Scheme for International Aviation represents the first worldwide market-based system aimed at a single industry sector. If you fly internationally or work in aviation, understanding how these credits work matters for the future of air travel. The program requires airlines to buy approved carbon credits when their emissions go above baseline levels.
Not all carbon credits qualify for CORSIA compliance. Only credits from approved programs and registries meet the strict requirements set by the International Civil Aviation Organization. Airlines must navigate rising prices and limited supply while meeting their offset obligations under this expanding system.
Key Takeaways
- CORSIA requires airlines to offset international flight emissions above 2019 levels using approved carbon credits starting in 2024
- Only carbon credits from ICAO-approved registries and programs qualify for airline compliance with CORSIA requirements
- Airlines face challenges with rising credit prices and limited supply while working toward long-term decarbonization goals
How CORSIA Credits Work
CORSIA operates through distinct phases with specific offsetting requirements that airlines must meet based on their international flight emissions above established baseline levels. The program uses market-based measures where airlines purchase eligible emissions units to compensate for growth in aviation carbon output.
Program Structure and Phases
CORSIA phase 1 runs from 2024 through 2026 as a pilot period with voluntary participation from countries. During this initial phase, you'll find that airlines from participating nations must offset emissions from their international flights above the baseline.
The second phase extends from 2027 to 2035 with broader mandatory participation. The ICAO Council oversees the entire program structure and determines which countries must participate in each phase.
You can use carbon credits with vintage years from 2021 onward during phase 1. The program accepts credits only from approved registries that meet ICAO's eligibility standards. Airlines track their air traffic and emissions data through standardized reporting systems that feed into the CORSIA monitoring framework.
Offsetting Requirements and Baseline Calculation
Your baseline calculation uses 2019 aviation emissions as the reference point. Airlines must offset any growth in their international flight emissions above this 2019 baseline level.
During phase 1, you calculate offsetting requirements based on sector-wide growth rather than individual airline growth. This means all participating airlines share the offsetting burden proportionally based on their total international air traffic.
The formula considers your airline's revenue ton-kilometers (RTKs) as a percentage of total sector RTKs. You then apply this percentage to the total sector offsetting requirement to determine your specific obligation. Airlines report their emissions annually through ICAO's monitoring system to ensure compliance.
Market-Based Mechanisms
The market-based measure allows you to purchase eligible emissions units from approved carbon credit programs. You can buy these credits from various sources including renewable energy projects, forestry initiatives, and industrial emissions reduction programs.
CORSIA-eligible carbon credits must meet strict quality standards set by ICAO. Credits require authorization from host countries for international use under Article 6 of the Paris Agreement. This ensures proper accounting in national greenhouse gas inventories.
You have access to credits from multiple approved registries including Verra and Gold Standard. Airlines typically work with carbon credit traders and brokers to secure the volume of offsets needed for compliance at competitive prices.
Eligibility Criteria for Carbon Credits
CORSIA eligible emissions units must meet strict program design and carbon offset credit integrity standards. The Technical Advisory Body evaluates carbon credit programs against specific criteria to ensure environmental and social integrity before approval.
Definition of CORSIA Eligible Emissions Units
CORSIA Eligible Emissions Units (EEUs) are carbon credits that airlines can use to offset their emissions under the international aviation carbon offsetting scheme. You can only use these credits if they come from programs approved by ICAO.
Verified Carbon Units issued through approved registries qualify as EEUs when they meet CORSIA standards. Each credit represents one metric ton of CO2 emissions that has been reduced or removed from the atmosphere. The credits must carry a unique identification number that tracks them from issuance through retirement.
Your airline needs to ensure the carbon credits you purchase are officially recognized as EEUs. Six carbon credit standards received approval during CORSIA's first phase review.
Quality and Integrity Standards
Carbon credits must demonstrate additionality, meaning the emission reductions would not have happened without the carbon offset project. You need credits from projects that create real environmental benefits beyond business-as-usual scenarios.
The credits you purchase must meet these core requirements:
- Permanence - emission reductions are long-lasting
- Verifiable - third parties can confirm the reductions
- Transparent - clear chain of custody through registry systems
- No double counting - credits claimed only once
Your carbon credits need accurate baseline and monitoring methodologies. The projects must avoid negative social or environmental impacts and follow sustainable development principles.
Role of Technical Advisory Body (TAB)
The Technical Advisory Body makes recommendations to the ICAO Council about which carbon credits qualify as EEUs. This ICAO body conducts annual assessments of programs seeking CORSIA-eligibility status.
Programs must meet both Program Design Elements Criteria and Carbon Offset Credit Integrity Assessment Criteria to gain approval. The TAB reviews applications from carbon credit programs worldwide and evaluates them against established benchmarks.
You benefit from the TAB's rigorous evaluation process because it ensures only high-quality carbon credits enter the market. The body's assessments help maintain environmental integrity across the entire CORSIA system.
Approved Registries and Programs
ICAO has authorized specific carbon credit registries to supply eligible emissions units for CORSIA compliance periods. Eight emissions unit programmes received approval for the first phase from 2024-2026, with additional programs gaining authorization for subsequent phases.
Gold Standard and Verra
Gold Standard and Verra are among four carbon standards that received ICAO approval for CORSIA participation. These registries allow airlines to purchase carbon credits that meet strict quality requirements for offsetting emissions.
Verra operates the Verified Carbon Standard, which became an approved program for CORSIA compliance. You can identify eligible credits through Verra's CORSIA label in their registry system. This label indicates which Verified Carbon Units (VCUs) meet CORSIA requirements.
Gold Standard also gained approval alongside Verra. Both registries maintain strict protocols for credit verification and issuance. You need to ensure any credits you purchase carry the appropriate CORSIA designation to use them for compliance.
Exclusions and Project Types
Not all carbon credit projects qualify for CORSIA eligibility. You must verify that your credits come from approved project types within authorized registries.
Renewable energy projects can generate CORSIA-eligible credits when they meet program requirements. However, ICAO evaluates each registry's eligible project categories separately. Some project types may be excluded even within approved registries.
Clearing members must deliver CORSIA eligible emissions units from registries approved by the ICAO Council for specific compliance periods. The approval status can change between phases, so you need to check current eligibility before purchasing credits.
REDD+ and Nature-Based Solutions
Architecture for REDD+ Transactions (ART) became one of the first two programs approved for CORSIA's initial phase. REDD+ projects reduce emissions from deforestation and forest degradation in developing countries.
The American Carbon Registry and ART both operate as Winrock International enterprises. These programs specialize in nature-based carbon credits, including forest conservation projects. You can access these credits for your CORSIA compliance obligations.
Nature-based solutions offer significant carbon reduction potential through ecosystem protection. REDD+ credits represent a major category within CORSIA-eligible units. These projects must meet additional verification standards to ensure permanence and prevent double counting of emissions reductions.
Compliance and Authorization Process
Airlines purchasing CORSIA carbon credits must navigate specific authorization and adjustment requirements to ensure their offsets meet international standards. Host countries play a central role in approving credits through formal letters, while tracking mechanisms prevent double counting of emission reductions.
Host Country Letters of Authorization (LoA)
You need a Letter of Authorization from the host country where your carbon offset project operates. This document grants permission for the carbon credits to be used for CORSIA compliance purposes. The host country authorization process ensures that the country acknowledges the credits are being transferred for international aviation offsetting.
Without an LoA, you cannot use those credits toward your CORSIA obligations. The host country may authorize credits at different scales or scopes, and they can revoke authorization if circumstances change. Project proponents must follow specific procedures when a host country changes or withdraws its authorization to maintain compliance.
Corresponding Adjustments
Corresponding adjustments prevent the same emission reduction from being counted twice. When you purchase CORSIA-eligible credits, the host country must apply a corresponding adjustment to its own national emissions inventory under the Paris Agreement. This accounting measure subtracts the transferred emission reductions from the host country's climate goals.
Countries with authorization responsibilities must track these adjustments through registries to maintain transparency and environmental integrity. The UNFCCC framework requires proper documentation of these transfers to ensure that emission reductions genuinely contribute to global climate action rather than being claimed by multiple parties.
CORSIA Monitoring and Reporting
You must monitor your airline's emissions and report them according to CORSIA standards. This includes tracking your fuel consumption, calculating CO2 emissions, and determining your offsetting requirements based on growth beyond the baseline year. Your reporting must be verified by an accredited third party.
The GCC Program facilitates carbon credit transactions through registries that track purchases and retirements of approved credits. You need to demonstrate that your purchased credits meet CORSIA eligibility criteria and have proper authorization documentation. Airlines must submit annual reports showing their emissions, offsets purchased, and overall compliance status to maintain their operating permissions.
Market Dynamics and Pricing Trends
The CORSIA carbon market is experiencing significant shifts in both supply availability and pricing structures, with investment-grade credits commanding prices around $20.10 per credit as of Q1 2026. Market forecasts suggest prices could reach substantially higher levels as the program phases continue and compliance requirements tighten.
Supply and Demand Outlook
You're facing a market where supply constraints are becoming increasingly apparent. CORSIA-eligible credits represent nearly 50% of the carbon market, but the availability of high-quality offsets remains limited. Airlines participating in this market-based measure need credits to offset emissions above 85% of 2019 levels.
The demand side tells an equally compelling story. With 126-130 countries voluntarily participating in Phase I, which runs through December 31, 2026, you can expect pressure on available credits to intensify. Project developers are racing to generate eligible credits, but regulations around quality and integrity are creating bottlenecks in supply.
Airlines must purchase credits to comply with CORSIA requirements, creating predictable baseline demand. However, uncertainty around exact airline demand levels makes market planning challenging for both buyers and sellers.
Regional Supply Insights
Your access to carbon credits varies significantly by region and project type. Different geographical areas produce varying volumes of CORSIA-eligible offsets, with quality standards determining which projects qualify under the program's strict criteria.
The CORSIA market began behaving like a live market in Q1 2025, with first tagged supply and initial retirements occurring. You should note that 6.3 million carbon credits were insured during this period, indicating growing market maturity.
Supply integrity has emerged as a critical factor in your purchasing decisions. Higher-rated projects command premium prices, reflecting your need for credits that meet both CORSIA eligibility requirements and additional quality benchmarks.
Price Scenarios
You're looking at dramatically different price projections depending on market conditions. Some analysts forecast prices could reach $97 per metric ton of CO2 equivalent in 2027—28 times higher than current average voluntary carbon market prices.
More conservative estimates suggest CORSIA compliance could add $2 to average ticket prices in Phase I and $5 in Phase II. Your actual costs will depend on credit quality requirements and timing of purchases.
The data shows a clear trend: average prices rose from $5.60 to $5.69 per credit in Q1 2026, even as total retirements fell 8% to 51 million credits. This inverse relationship between volume and price signals tightening market conditions that favor sellers over buyers.
Pathways to Decarbonization Beyond Offsetting
Airlines are investing in sustainable aviation fuels and carbon removal technologies as long-term alternatives to carbon credits. These solutions directly reduce emissions rather than compensating for them through offsets.
Sustainable Aviation Fuels (SAF)
Sustainable aviation fuel offers the most immediate path to cutting your airline's carbon footprint. SAF can reduce lifecycle emissions by up to 80% compared to conventional jet fuel.
You can use SAF as a drop-in replacement for traditional fuel without modifying your existing aircraft engines. This makes it a practical solution right now rather than waiting for new technologies.
Current SAF production comes from:
- Used cooking oil and animal fats
- Plant-based materials like corn and sugarcane
- Municipal solid waste
- Algae and other advanced feedstocks
The main challenge you face with sustainable aviation fuels is limited supply and high costs. SAF currently costs two to four times more than conventional jet fuel. Production capacity needs to scale up significantly to meet industry demand.
Carbon Removals and Direct Air Capture
Carbon removals pull CO2 directly from the atmosphere, offering a way to address emissions you cannot eliminate. Direct air capture uses chemical processes to extract CO2 from ambient air and store it permanently underground.
You should understand that carbon removals differ from traditional offsets. They physically remove existing CO2 rather than preventing future emissions elsewhere.
Boeing's approach prioritizes avoiding emissions first, then uses permanent carbon dioxide removal for hard-to-reduce business travel emissions. This strategy reflects growing industry focus on removal technologies.
Direct air capture remains expensive, with costs ranging from $600 to $1,000 per ton of CO2. However, technology improvements and policy support are driving costs down over time.
The Future Role of Offsetting in Aviation
Offsetting will remain necessary as scalable low-carbon flight technologies are still years away. You need carbon credits to bridge the gap while developing and deploying sustainable alternatives.
Your offsetting strategy should shift toward high-quality credits that meet stricter environmental standards. Credits with corresponding adjustments under Article 6 of the Paris Agreement provide greater credibility and prevent double counting.
Airlines increasingly view offsets as a temporary solution rather than a permanent fix. Your long-term strategy should prioritize SAF adoption and operational improvements while using credits only for remaining emissions.
The credit market faces challenges including limited supply and concerns about project quality. You should expect tighter regulations and higher standards for eligible credits under CORSIA in coming years.
Key Challenges and Future Perspectives
The CORSIA program faces critical hurdles around airline participation levels, credit quality standards, and shifting global regulations that will shape how effectively the aviation sector addresses its carbon footprint.
Participation and Regulatory Uncertainty
You need to understand that CORSIA operates on a voluntary basis until 2027, which creates uncertainty about which airlines will actually participate. Currently, 126 markets comply with the scheme, but not all countries have committed to joining during the voluntary phase. This creates an uneven playing field where some airlines face compliance costs while their competitors do not.
The regulatory landscape continues to shift as countries evaluate their commitments. You should know that ICAO reviews and updates the program regularly, which means the rules governing credit eligibility and offsetting requirements can change. Airlines struggle to plan long-term strategies when they cannot predict future compliance obligations or costs.
Regional differences add another layer of complexity. Some jurisdictions may implement stricter requirements than the baseline CORSIA standards, while others might delay participation. This patchwork approach makes it harder for international aviation operators to develop consistent sustainability strategies across their global routes.
Ensuring Environmental Integrity
You face questions about whether CORSIA credits actually deliver meaningful emissions reductions. The environmental integrity of carbon offsets depends on whether projects would have happened without credit revenue and whether they prevent emissions that would otherwise occur.
ICAO has established strict eligibility criteria, but critics argue that some approved credits may not represent real climate benefits. You should verify that credits come from projects with robust monitoring and verification processes. The quality varies significantly between different project types and carbon standards.
Demand for CORSIA-eligible carbon credits creates pressure to approve more projects, which could compromise quality standards. Airlines need enough supply to meet their obligations, but expanding the pool of eligible credits too quickly risks including lower-quality offsets.
Evolving International Standards
The space between current CORSIA requirements and future climate goals continues to narrow. ICAO periodically updates which carbon crediting programs qualify for the scheme, removing programs that do not meet updated criteria. You must stay informed about these changes to ensure your credits remain valid.
International standards are tightening as climate science advances and stakeholder expectations increase. New requirements around additionality, permanence, and social safeguards reshape which projects can generate CORSIA-eligible credits. These evolving international standards reflect growing understanding of what constitutes genuine carbon reduction.
You should expect the program to become more stringent over time as ICAO responds to pressure from environmental groups and member states pushing for stronger climate action in the aviation sector.
Frequently Asked Questions
Airlines must offset emissions above 2019 baseline levels by purchasing approved carbon credits, with requirements varying based on route participation and compliance phase timelines.
How does the international aviation offsetting scheme work in practice?
CORSIA requires airlines to monitor, report, and offset CO2 emissions from international flights that exceed a baseline level. The baseline uses 2019 emission levels as the reference point.
Airlines calculate their emissions on covered routes throughout the year. If your airline's emissions exceed the baseline threshold, you must purchase and cancel carbon credits to offset the difference.
The program operates in distinct phases. The pilot phase ran from 2021 to 2023, followed by the first phase from 2024 to 2026. The second phase will run from 2027 to 2035.
Currently, the program allows voluntary participation during the first phase. CORSIA becomes mandatory in 2027, requiring airlines to offset emissions growth above 85% of 2019 levels.
What eligibility criteria must emissions units meet to be used for airline offsetting obligations?
Host countries must authorize carbon credits for international mitigation purposes like CORSIA. These countries must also ensure the emission reductions are not counted toward their National Determined Contribution under the UNFCCC process.
ICAO maintains a list of approved carbon credit programs that meet specific quality standards. Your airline can only use emissions units from these approved programs to meet compliance obligations.
The credits must represent real, verified emission reductions or removals. They need to be permanent and additional, meaning the reductions would not have happened without the carbon credit project.
How are airline offsetting requirements calculated for a given compliance period?
You calculate your offsetting requirement by comparing your international flight emissions to the baseline. The baseline amount depends on which phase of CORSIA is currently active.
Your airline reports total CO2 emissions from covered international routes during the compliance period. You then apply the offsetting percentage that applies to that specific phase and your participation status.
The calculation considers growth factors and route-specific participation rules. Airlines operating routes between participating countries face different requirements than those flying to non-participating states.
Which countries and airlines participate, and how does participation change over time?
Participation varies by phase, with more countries joining as the program transitions from voluntary to mandatory status. During the pilot and first phases, countries opt in voluntarily.
Your participation depends on whether your routes connect participating countries. If both the departure and arrival countries participate, you must comply with CORSIA requirements for those flights.
The mandatory phase beginning in 2027 will significantly expand participation. More airlines will face offsetting obligations as additional countries join the program and voluntary participation ends.
How are emissions units for aviation compliance priced and what factors drive price changes?
Carbon credit prices for CORSIA compliance fluctuate based on supply and demand in the market. Prices vary depending on the credit type, project location, and verification standards.
Demand increases as more airlines need credits to meet their offsetting obligations. Limited supply of ICAO-approved credits can drive prices higher during compliance periods.
Market factors include the number of participating airlines, total emission levels above baseline, and availability of eligible projects. Price changes also reflect policy updates and changes to approved carbon credit programs.
Who typically buys eligible emissions units and how are they sourced and verified?
Airlines subject to CORSIA requirements are the primary buyers of eligible carbon credits. You purchase these credits either directly from project developers or through intermediaries and carbon brokers.
Credits come from approved offset projects that reduce or remove greenhouse gas emissions. These projects undergo verification by accredited third-party auditors who confirm the emission reductions meet ICAO standards.
Your airline must ensure purchased credits meet all eligibility requirements before using them for compliance. The credits are tracked through registries that prevent double-counting and ensure proper retirement when used for offsetting.
