In brief: the sources provided do not make it possible to establish a specific tax consequence solely because you cannot justify a property located abroad. They mainly concern accounts and certain investments held abroad, as well as the IFI.
The rules cited do not directly concern the foreign property
The provisions examined distinguish between accounts held abroad, certain contracts or investments taken out abroad, and digital assets. In the excerpts provided, they do not provide that an unjustified foreign property is automatically considered assets acquired free of charge, taxable income or a confiscated asset. <!-- sources: S011, S013, S017 -->
The consequences provided for certain foreign assets
Article 755 of the French General Tax Code concerns assets held in an account located abroad, certain contracts or investments taken out abroad, and digital assets. When their origin and terms of acquisition have not been justified under the procedure provided for in Article L. 23 C of the French Tax Procedure Code, these items are deemed, until proven otherwise, to constitute assets acquired free of charge. They may then be subject to transfer duties free of charge at the highest rate provided for by the cited text. The excerpt provided does not mention real estate. <!-- sources: S011 -->
Article 1649 A concerns, in particular, the obligation for individuals domiciled or established in France to declare the details of their accounts opened, held, used or closed abroad. It also provides for a presumption of taxable income for sums, securities or assets transferred through undeclared accounts, unless proven otherwise. This rule concerns the relevant accounts and transfers, not merely the absence of supporting documents for a property located abroad. <!-- sources: S010, S013, S017 -->
The link with the IFI
If you are tax resident in France, the IFI may apply to your real estate assets located in France and abroad, according to the scope set out by the source provided. This rule determines the potential IFI tax base; it does not specify the consequence of the absence of documents enabling you to justify a foreign property. <!-- sources: S009 -->
A 40% surcharge is mentioned when the IFI return is filed late after the disclosure of assets abroad that have not been subject to certain reporting obligations, in particular those provided for by Articles 1649 A, 1649 AA and 1649 AB of the French Tax Code. The source does not make it possible to conclude that this surcharge applies automatically because you cannot justify a property located abroad. <!-- sources: S004 -->
What the sources make it possible to conclude
You cannot infer from the texts provided alone an automatic penalty, tax assessment or presumption applicable to your unjustified foreign property. The answer would depend in particular on the reporting rule actually concerned and on the tax situation under examination; these elements are not specified by the sources selected.
Informational content, not personalised tax advice.