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Income tax - Narrative (Details) - EUR (€) € in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities | € 17,616 | € 1,584 | € 444
Deferred tax assets | 241,894 | 155,715 | 116,006
Net deferred tax liabilities | 5,848 | 0 | 0
Unused tax losses for which no deferred tax asset recognised | 911,776 | 609,390 | 459,752
Royalty certificates |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities | 17,208 | 0 | 0
Deferred tax assets |  | 1,427 | 0
Royalty certificates | France |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 11,720 |  |
Abivax LLC |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused tax losses for which no deferred tax asset recognised | € 1,083 | € 112 | € 38

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