Do Voluntary Credits Need An Article 6 Authorization Letter?
Voluntary carbon credits can be issued, sold and retired without an Article 6 authorization letter in many voluntary carbon market contexts. The requirement depends on the credit’s intended use, the buyer’s claim, the host country’s rules, the carbon standard, the registry label and any compliance framework attached to the transaction.
The more precise term is host-country Article 6 authorization. The document is often called a Letter of Authorization or LoA. It is the formal instrument through which a host country authorizes specified mitigation outcomes for a defined use and commits to the relevant accounting treatment.
Carbon Direct states that Letters of Authorization are required when credits are used within international accounting frameworks such as CORSIA or compliance mechanisms tied to NDC targets. Carbon Direct also states that LoAs are rarely required for voluntary corporate climate claims today because corporate and national greenhouse gas accounting frameworks operate in parallel. 1
The direct answer is no. A voluntary credit does not need an Article 6 authorization letter simply because it is sold in the voluntary carbon market.
The transaction answer is claim-specific. Authorization matters when the buyer needs host-country authorization, corresponding adjustment treatment, CORSIA eligibility, ITMO treatment or another Article 6-linked use.
The Correct Term
“Article 6 authorization letter” is market shorthand. The cleaner drafting term is host-country Article 6 authorization. The evidence is often a Letter of Authorization, although some jurisdictions may use approval letters, authorization statements, government templates, registry-linked labels or national carbon market instruments.
Sylvera describes an LoA as a formal letter issued by the host country that authorizes the international transfer of mitigation outcomes and commits to applying a corresponding adjustment for the volume described in the letter. 2
Host-Country Decision
The host country permits specified mitigation outcomes to be used for a defined purpose.
Document Evidence
The Letter of Authorization records the authorized use, covered volume, entity and accounting position.
Corresponding Adjustment
The host country adjusts its accounting so the same mitigation outcome is not counted twice for the relevant claim.
Claim Pathway
The buyer’s intended use determines whether authorization matters.
When Authorization Is Needed
UNFCCC describes Article 6.2 as accounting and reporting guidance for Parties to use internationally transferred mitigation outcomes toward their nationally determined contributions. UNFCCC describes Article 6.4 as the Paris Agreement Crediting Mechanism for trading high-quality carbon credits. 3
Authorization is relevant when the credit enters a use case governed by international accounting or a claim framework that requires corresponding adjustment treatment. Gold Standard states that authorization of ITMOs is typically done through a Letter of Authorization and affirms the host country’s commitment to account for the emission reductions or removals through corresponding adjustments. 4
| Use Case | Authorization Position | Buyer Implication |
|---|---|---|
| Use Toward Another Country’s NDC | Authorization and corresponding adjustment treatment are required. | The credit moves into Article 6 accounting and should be documented as an ITMO or authorized mitigation outcome. |
| CORSIA | Authorization can be required under eligible unit and registry-labelling rules. | The buyer should confirm CORSIA eligibility, authorized use, first transfer treatment and registry evidence. |
| Compliance Scheme Linked To NDC Accounting | Authorization may be required where foreign credits support a compliance obligation counted toward a country’s NDC. | The buyer should test the scheme rules, host-country authorization and corresponding-adjustment route. |
| Voluntary Corporate Offset Claim | Depends on the claim framework, buyer policy, standard rules and host-country position. | The buyer should decide whether exclusive compensatory accounting is required for the claim being made. |
| Contribution Claim | Often possible without Article 6 authorization. | The buyer supports mitigation and avoids claiming exclusive offset accounting against its own emissions balance. |
| Ordinary VCM Retirement | Authorization is not a blanket requirement. | The buyer should verify registry issuance, retirement evidence, credit quality and claim wording. |
Authorization Is Separate From Credit Quality
Article 6 authorization is an accounting and claims issue. It does not certify additionality, permanence, baseline conservativeness, leakage control, safeguards quality or MRV strength.
ICVCM states that Article 6 and the Core Carbon Principles have different roles. Article 6 creates rules for countries to cooperate through carbon crediting and trading between governments, while ICVCM provides standards and assurance for the voluntary carbon market through the Core Carbon Principles and Assessment Framework. 5
A buyer still needs the full project file: PDD, methodology fit, validation report, verification statement, monitoring report, carbon rights evidence, registry record, safeguards file, leakage assessment, permanence treatment and retirement evidence.
Adjusted And Non-Adjusted Credits In The VCM
Gold Standard states that Article 6 created two types of credits, adjusted and non-adjusted, that can be used in the voluntary market. It also states that both types are needed. 6
The distinction is about the claim. A credit with corresponding adjustment treatment may be suitable for claims that need exclusive accounting. A credit without corresponding adjustment treatment can still support credible contribution-style claims or other permitted voluntary uses where the claim is framed correctly.
VCMI’s Claims Code is built for companies making credible voluntary use of carbon credits as part of climate plans and requires high-quality credits proportionate to remaining emissions after progress toward near-term reduction targets. 7
What Buyers Should Ask Before Purchasing
The buyer should start with the claim, then work backward to the credit. The claim determines whether Article 6 authorization belongs in the eligibility criteria.
| Question | What To Check | Document Evidence |
|---|---|---|
| What claim will be made? | Offset-style claim, contribution claim, CORSIA use, NDC use, compliance use or internal climate finance claim. | Claims memo, buyer policy, legal review and sustainability reporting position. |
| Is corresponding adjustment required? | Whether the claim needs exclusive accounting treatment or Article 6 authorization. | Host-country authorization, registry label, standard rules and corresponding adjustment evidence. |
| What does the LoA cover? | Authorized use, covered volume, vintage, entity, crediting period, project and first-transfer treatment. | Letter of Authorization, government template, national registry record or approved authorization instrument. |
| Does the credit meet quality criteria? | Additionality, permanence, leakage, baseline, MRV, safeguards, validation and verification. | PDD, monitoring report, VVB reports, registry documents, ratings and safeguards records. |
| What happens if authorization fails? | Replacement credit rights, refund rights, price adjustment, delivery default and claim-use failure remedies. | ERPA, purchase agreement, delivery covenant package and replacement-credit standard. |
Transaction Impact For Carbon Finance
Article 6 authorization can affect pricing, buyer eligibility, ERPA financeability, advance rates, delivery covenants and replacement credit standards. Authorized credits may access buyers that require corresponding adjustment treatment.
For pre-issuance funding, ERPA-backed funding and carbon streams, authorization should be drafted as a defined transaction variable. It can operate as a condition precedent, a draw condition, a pricing step-up, a delivery covenant, a replacement-credit standard or a termination trigger.
A funder should still underwrite the ordinary carbon project risks: carbon rights, PDD quality, methodology fit, MRV design, safeguards, VVB status, registry pathway, verification timing and delivery remedies.
FAQ
Do voluntary credits need an Article 6 authorization letter?
Voluntary credits can be used without Article 6 authorization in many VCM contexts. Authorization becomes relevant when the intended use requires host-country authorization, corresponding adjustment treatment or Article 6-linked eligibility.
What is the proper term?
The more precise term is host-country Article 6 authorization. The document is often called a Letter of Authorization or LoA.
Can non-authorized credits be used in the voluntary carbon market?
Yes. Non-authorized credits can be used in the voluntary market when the claim is accurate and the relevant standard, host-country rules and buyer policy allow that use.
Does Article 6 authorization prove high integrity?
Article 6 authorization addresses accounting and authorized use. High integrity still depends on additionality, permanence, leakage, MRV, safeguards, validation, verification and registry controls.
When should a buyer require authorization?
A buyer should require authorization for NDC use, CORSIA use, Article 6.2 ITMO transactions and voluntary claims that require corresponding adjustment treatment.
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A voluntary credit does not need an Article 6 authorization letter as a universal condition of use. The buyer needs authorization when the intended claim, compliance pathway, registry label, host-country rule or buyer policy requires authorized mitigation outcomes and corresponding adjustment treatment.
The procurement file should start with claim design. After that, the buyer can set the correct eligibility criteria: authorized credit, non-authorized credit, contribution claim, CORSIA-eligible unit, ITMO-linked delivery or ordinary VCM retirement.
Authorization is one layer. Credit quality still comes from the project record: carbon rights, PDD, methodology fit, MRV, safeguards, VVB validation, verification, registry issuance and enforceable delivery terms.
Sources And Footnotes
The sources below are cited for general market context. Carbon Direct, UNFCCC, Sylvera, Gold Standard, ICVCM, VCMI and other cited third parties are not affiliated with FG Capital Advisors or Carbon Stream Fund and have not reviewed, approved, sponsored or endorsed this article or any related strategy.
- Carbon Direct, Carbon credits and Letters of Authorization: Cutting through the confusion. Carbon Direct states that LoAs are required when credits are used within international accounting frameworks such as CORSIA or compliance mechanisms tied to NDC targets, and that LoAs are rarely required for voluntary corporate climate claims today. Source Carbon Direct LoA guidance
- Sylvera, Article 6 Authorizations & Corresponding Adjustments. Sylvera describes an LoA as a formal letter issued by the host country that authorizes international transfer of mitigation outcomes and commits to applying a corresponding adjustment for the volume described in that letter. Source Sylvera Article 6 authorization FAQ
- UNFCCC, Article 6 of the Paris Agreement. UNFCCC describes Article 6.2 as accounting and reporting guidance for Parties to use internationally transferred mitigation outcomes toward NDCs and Article 6.4 as a UNFCCC mechanism for trading high-quality carbon credits. Source UNFCCC Article 6 overview
- Gold Standard, Article 6 and CORSIA Labelling Step-by-Step Guide. Gold Standard states that authorization of ITMOs is typically done through a Letter of Authorization and affirms the host country’s commitment to account through corresponding adjustments. Source Gold Standard Article 6 and CORSIA labelling guide
- ICVCM, How Article 6 and the CCPs work together for climate action. ICVCM explains that Article 6 and the Core Carbon Principles perform different roles across compliance and voluntary markets. Source ICVCM Article 6 and CCPs
- Gold Standard, The Mitigation Contribution under Article 6. Gold Standard states that adjusted and non-adjusted credits can both be used in the voluntary market. Source Gold Standard mitigation contribution note
- VCMI, Claims Code of Practice. VCMI states that the Claims Code is for companies making credible voluntary use of carbon credits and that Carbon Integrity Claims require the purchase and retirement of high-quality carbon credits proportionate to remaining emissions after progress toward near-term targets. Source VCMI Claims Code of Practice
- Carbon Stream Fund public page. Source Carbon Stream Fund
This material is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, investment advice, legal advice, tax advice or a commitment to provide financing. Article 6 authorization, corresponding adjustments, CORSIA eligibility and voluntary claims treatment should be reviewed with qualified legal, tax, accounting, registry and carbon market advisers. Any transaction would be subject to due diligence, KYC, AML and sanctions screening, documentation, counterparty approval, technical review, registry review, legal review and final commercial agreement. Carbon credit investments involve land, title, methodology, MRV, permanence, reversal, leakage, verification, delivery, registry, host-country, market, liquidity, regulatory, community, safeguards, buyer-claim and counterparty risks. FG Capital Advisors may act as advisor, arranger, consultant or principal depending on the mandate and applicable law.
