Voluntary vs compliance carbon markets
Compliance carbon markets are created by law — governments cap emissions and force regulated companies to surrender allowances or credits. Voluntary carbon markets are where individuals and organisations choose to offset beyond any legal requirement. They use different units, different prices, and different rules, and the two generally don't mix. When you offset as a person or a non-regulated business, you're in the voluntary market.
“Carbon market” is really two different markets wearing the same name. Knowing which one you’re in clears up most of the confusion around prices, rules, and what a credit actually means.
The compliance market: created by law
Compliance markets exist because governments cap emissions. Under an emissions trading system (ETS) — the EU ETS, the UK ETS, California’s Cap-and-Trade, and others — a regulator sets a hard limit on total emissions, issues a fixed number of allowances, and requires covered companies (power stations, heavy industry, airlines) to surrender one allowance for every tonne they emit. The cap ratchets down each year, which is what drives decarbonisation.
Two features define this market: participation is mandatory for covered entities, and the unit traded is a government allowance, not a project credit. Prices are set by supply and demand within the cap and can be substantial — often tens to over a hundred euros per tonne.
The voluntary market: chosen by the buyer
The voluntary carbon market (VCM) is where individuals, companies, and institutions offset by choice, beyond any legal requirement. The unit here is a project-based credit — issued by a standard such as Verra or Gold Standard for an avoidance or removal project — and retired to back a voluntary claim like “we offset our flights” or a corporate net-zero target.
This is where BuyCarbonOffsets.org operates. Nobody is forcing the purchase; buyers act on their own initiative.
Side by side
| Compliance market | Voluntary market | |
|---|---|---|
| Driven by | Government regulation | Buyer choice |
| Participation | Mandatory for covered emitters | Optional |
| Unit | Allowances (+ some eligible credits) | Project-based credits |
| Quality set by | Law and the regulator | Independent standards & integrity bodies |
| Typical buyer | Power, industry, aviation | Individuals, companies, events |
Between the two: Article 6 and CORSIA (2026)
The line between the markets is blurring at the edges. The Paris Agreement Crediting Mechanism (Article 6.4) — the UN’s successor to the CDM — issued its first credits on 26 February 2026, a clean-cooking activity in Myanmar, at roughly 40% of the volume the old CDM accounting would have given it. Old CDM methodologies stopped counting for new crediting at the end of 2025. And CORSIA, the airline scheme, is in its first mandatory phase (2024–26, compliance due January 2028): only credits that carry a host-country Letter of Authorization with a corresponding adjustment are eligible, which is why “CORSIA-eligible” is a fact about a specific unit, not a project type.
For a voluntary buyer the practical point is unchanged: what you retire is a project credit, and its quality is set by the standard and the ICVCM’s assessment of the methodology, not by a regulator. Note also that from 27 September 2026 EU consumer law prohibits claiming a product is “climate neutral” or “climate compensated” on the basis of offsetting — a retirement supports a contribution claim, not a neutrality claim.
Why the distinction matters for you
In a compliance market, quality is guaranteed by law — the regulator decides what counts. In the voluntary market, there is no such backstop, so quality varies and where you buy matters. Integrity is governed instead by registries and bodies like the ICVCM, whose Core Carbon Principles set a cross-registry quality bar.
The absence of a legal mandate should never mean an absence of rigour. We only sell registry-traceable credits, dated within the last 36 months, that pass an ICVCM Core Carbon Principles screen — so a voluntary purchase still buys real, verifiable climate action.
What is the difference between voluntary and compliance carbon markets?
Compliance markets are created and enforced by governments — regulated emitters must hold and surrender allowances or eligible credits to cover their emissions. Voluntary markets are where individuals and organisations buy and retire credits by choice, beyond any legal obligation. They use different units, prices, and eligibility rules.
Which market am I in when I offset?
If you are an individual or a company offsetting voluntarily — not because a regulator requires it — you are in the voluntary carbon market. That's the market BuyCarbonOffsets.org serves.
What is a compliance market like the EU ETS?
An emissions trading system (ETS) is a government cap-and-trade scheme. The regulator sets an overall cap on emissions, issues a limited number of allowances, and requires covered installations to surrender one allowance per tonne emitted. The cap falls over time, and the price is set by the market within that cap.
Are voluntary credits lower quality than compliance units?
Not inherently — but voluntary quality is governed by independent standards rather than law, so it varies more. High-integrity voluntary credits are registry-traceable, independently verified, and screened against benchmarks like the ICVCM Core Carbon Principles. That's the bar we hold to.
Can I use voluntary credits to meet a compliance obligation?
Generally no. Compliance schemes define narrowly which units are eligible, and most voluntary credits don't qualify. Voluntary credits are for voluntary claims — corporate net-zero pledges, contribution claims for an event, or personal offsetting. (From 27 September 2026, EU consumer law no longer allows a product or event to be called "climate neutral" on the strength of offsetting.)
