How Carbon Markets Work: VCM vs Compliance Markets

Carbon markets create economic incentives to reduce greenhouse gas emissions by putting a price on carbon. Two distinct market types have emerged: compliance markets, where companies must meet regulatory emissions caps, and the voluntary carbon market (VCM), where participants choose to offset emissions. Understanding the differences between these systems is essential for anyone navigating carbon finance, whether you're a corporate buyer, project developer, or investor.

What Are Compliance Carbon Markets?

Compliance markets are government-mandated cap-and-trade systems where regulated entities must surrender emissions allowances equal to their verified emissions. The most established compliance markets include the EU Emissions Trading System (EU ETS), California's Cap-and-Trade Program, and the Regional Greenhouse Gas Initiative (RGGI) in the northeastern United States.

These systems work through baseline caps that decline over time. Governments issue or auction a fixed number of carbon allowances, creating scarcity. Companies that reduce emissions below their allocation can sell excess allowances to those struggling to comply.

This market mechanism theoretically drives emissions reductions at the lowest overall cost.

Compliance markets generated over $949 billion in trading value globally in 2023, with the EU ETS accounting for roughly 90% of that volume. Prices are typically higher than VCM credits because non-compliance carries legal penalties. EU ETS allowances traded around €60-80 per ton in early 2025.

How the Voluntary Carbon Market Functions

The VCM operates without regulatory mandates. Companies, organizations, and individuals purchase carbon credits to compensate for emissions they cannot immediately eliminate. Each credit represents one metric ton of CO₂ either avoided, reduced, or removed from the atmosphere.

Credits originate from verified projects across various categories: nature-based solutions like reforestation, renewable energy installations, methane capture, and engineered removals such as direct air capture. Independent registries like Verra, Gold Standard, and the American Carbon Registry track credit issuance and retirement to prevent double-counting.

The VCM reached approximately $2 billion in transaction value in 2024, a significant contraction from its 2021 peak of nearly $2 billion due to increased scrutiny of credit quality. Prices vary widely based on project type, co-benefits, and vintage, typically ranging from $5 to over $50 per ton.

Unlike compliance markets where allowances represent permission to emit, VCM credits fund emission reduction activities. Buyers use them to demonstrate climate leadership, work toward net-zero commitments, or support specific project types aligned with corporate values.

Key Differences Between VCM and Compliance Markets

Regulatory structure: Compliance markets are legally binding with penalties for non-compliance. The VCM is entirely voluntary, though corporate commitments like Science Based Targets create quasi-regulatory pressure.

Price dynamics: Compliance allowances trade at premium prices due to legal risk. VCM credits are generally cheaper but face greater quality scrutiny and price volatility.

Fungibility: Within a compliance system, allowances are interchangeable. VCM credits vary significantly in methodology, additionality, and perceived quality, making them non-fungible in practice.

Linkage opportunities: Some compliance markets accept VCM credits under specific conditions. CORSIA, the aviation sector's offsetting scheme, bridges both markets by allowing eligible VCM credits to meet compliance obligations.

Where These Markets Are Heading

Both market types are evolving rapidly. Compliance markets are expanding geographically, with new systems launching in Asia and South America while existing programs tighten caps. Article 6 of the Paris Agreement may eventually create a global framework connecting compliance markets internationally.

The VCM is undergoing quality reforms led by the Integrity Council for the Voluntary Carbon Market (ICVCM), which established Core Carbon Principles to standardize credit integrity. Enhanced transparency through platforms like AlliedOffsets and BeZero Carbon is helping buyers distinguish high-quality credits from questionable ones.

Corporate buyers increasingly use both markets strategically: purchasing compliance allowances where required and VCM credits for beyond-value-chain emissions under Scope 3 commitments.

Key Takeaway

Compliance and voluntary carbon markets serve different but complementary roles in climate finance. Compliance markets create hard emissions caps for regulated sectors, while the VCM directs voluntary capital toward emission reduction projects globally. As both markets mature and potentially converge through mechanisms like CORSIA and Article 6, understanding their distinct structures becomes increasingly valuable for effective climate strategy.