ISDA has published the 2026 Emissions Transactions Definitions, a natively digital framework for documenting physically settled over-the-counter derivatives on emissions allowances under mandatory schemes in the EU, the UK and the US. The definitions are available now on ISDA MyLibrary.

The release replaces paper-era documentation mechanics with a fully digital, versionable definitional booklet plus accompanying confirmation templates. The practical change sits in how updates propagate: desks can reference the relevant version at the point of execution instead of renegotiating relationship-level documentation each time the framework changes.

What changes for documentation workflow?

Under the previous construct, any amendment to emissions definitions forced participants back to master-agreement level paperwork. The 2026 structure shifts version control to the transaction itself.

The mechanics are straightforward:

• A fully digital definitional booklet serves as the master text.
• Confirmation templates incorporate the version in force when a trade executes.
• Updates to existing emissions trading systems (ETSs), or the addition of new schemes, flow through the booklet rather than through bilateral re-papering.

For legal and operations teams, this reduces the amendment cycle that has historically accompanied every regulatory change to an ETS. For front-office desks, it narrows the window in which confirmation terms and current market framework can diverge.

Katherine Tew Darras, ISDA's General Counsel, framed the release as part of a broader documentation shift. "The launch of the 2026 ISDA Emissions Transactions Definitions marks another milestone in the digitization of our derivatives documentation. Converting these terms into a fully digital, versionable booklet will enable market participants to maintain and adapt their documentation more efficiently as the market evolves, giving them greater certainty over the terms that apply to individual transactions," she said.

Which markets are covered?

The definitions apply to physically settled OTC derivatives referencing emissions allowances under mandatory ETSs in three jurisdictions: the EU, the UK and the US. ISDA frames the digital architecture as preparation for continued evolution of these systems — the EU and UK schemes undergo regular phases and cap revisions, and US programs operate at state and regional level.

What the release does not do is extend coverage to voluntary carbon markets or to cash-settled structures; the definitions are scoped to mandatory-scheme allowances with physical settlement.

Mandated versus chosen

Nothing here is mandated. The 2026 definitions are contractual architecture that counterparties adopt by reference. ISDA's assertion — that digitization delivers efficiency and certainty — rests on the versioning mechanics described above, not on any measured adoption data. The association has not published figures on outstanding emissions derivatives notional or on how quickly the market will migrate from earlier definitional sets.

What can be verified: the definitions exist, they are digital, they are live on ISDA MyLibrary, and they cover three mandatory ETSs. What remains to be seen is uptake.

Access

The 2026 ISDA Emissions Transactions Definitions are available on ISDA MyLibrary at www.isda.org/isda-solutions-infohub/mylibrary/. ISDA has listed press contacts in London (Nick Sawyer, Joel Clark, Christopher Faimali, Michael Milner-Watt) and Hong Kong (Nikki Lu) for queries.

The structure positions emissions documentation to absorb the next round of ETS design changes — new phases, revised caps, additional jurisdictions — through booklet updates rather than bilateral amendment, and ISDA signals that further digitization of its derivatives documentation library will follow.