An annulment has retroactive effect back to the moment of birth.
Civil Code
2015 English source edition · Current applicability not established.
This is the 2015 English-language edition attributed in its front matter to the Ministry of Justice. Eri Atlas has not independently verified the translation, later changes, or whether the text is currently in force. Nine passages are incomplete in the available scan and are identified where they occur.
Article 665
Retroactive Effect of Annulment · Preserved transcription; page attribution imported from the source collection. Verify against the original.
Rights acquired by third parties shall however be respected. Persons who have acquired rights in accordance with this Code’s provisions on Successions are not considered to be third parties.
There shall be no obligation to restitute costs of support nor of revenues from the parental use of the child’s assets.
If a person loses his rights because of the retroactive effect, he shall not have the obligation to restitute property which he has disposed of at the moment at which the proceedings were instituted, or, if this person himself has instituted the proceedings, at the moment at which he could reasonably foresee that he would institute proceedings.