| By 31.03. | Entry and confirmation of verified emissions for the year 2023 in the Union Registry for operator and aviation operator holding accounts | Authorised representatives of independent verifiers |
| From 01.04. | Blocking of operator and aviation operator holding accounts if no verified emissions have been entered and approved for 2023 | Central administrator of the Union Registry |
| By 30.06. | Transfer of EUA and aEUA to accounts of operators and aircraft operators who receive an allocation | Austrian Emissions Trading Registry |
| By 30.09. | Surrender of allowances for the verified emissions of 2023 or according to the corrected emissions data, if the Competent Authority has corrected them. The surrender has to include a carry-over from the previous year if the balance has not been zero. | Authorised representatives of operator and aircraft operator holding accounts |
| From 01.10. | Publication of the compliance status | Central administrator of the Union Registry |
| By 30.06. | Confirmation of account data (so-called annnual confirmation) according to Article 22 (1) of the EU Regulation 2019/1122. Suspended in 2025. | Account holder |
