Carbon compliance calendar
The dates that matter across carbon markets and climate rules, each with its status and the
legal text or standard it comes from. What is law, what is adopted but not yet in force, and
what is only proposed are labelled separately and never mixed.
January 2027
1 January 2027
CORSIA · International (ICAO)
CORSIA second phase begins
In law
The second phase, 2027 to 2035, makes offsetting mandatory for international flights between states above ICAO's participation thresholds. Least developed countries, small island developing states and landlocked developing countries are exempt unless they volunteer.
CORSIA explained
Source: ICAO Assembly Resolution A41-22; Annex 16, Volume IV
January 2028
31 January 2028
CORSIA · International (ICAO)
CORSIA first phase cancellation deadline
In law
Aeroplane operators cancel eligible emissions units covering their offsetting requirements for the first phase, 2024 to 2026.
CORSIA explained
Source: ICAO Annex 16, Volume IV
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- https://crbn.credit/calendar.ics
- https://crbn.credit/calendar.ics?topic=cbam (one topic: empco, eu-ets, ets2, cbam, uk-cbam, corsia, sbti)
- https://crbn.credit/calendar.ics?include=proposed (adds proposals that are not law)
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This calendar gives general information from the legal texts and standards cited. It is not legal or regulatory advice.
Source: each entry's own legal text or standard · Dates verified 25 September 2026