The group lost its case before the State Council (Counseil d’Etat) on 19 July, which ruled that abiding by the US Foreign Account Tax Compliance Act (Fatca) did not breach France’s privacy laws.
The top administrative court also rejected the argument that the relationship is one-sided, amid allegations that the US is not reciprocating with the French tax authorities.
According to a statement on the Americains Accidentels website, the association will refer its compliant to the European Commission.
Set up in 2017, its aim is to represent and defend French-American dual citizens who live outside of the US and fight the application of Fatca and citizenship-based taxation in France.
The group membership is comprised of those born in the US to foreign parents; as, under US law, this automatically grants them citizenship.
Most, however, would have left the US without appreciating their citizenship status or the international burden it places on them.
US citizens living overseas have faced considerable difficulties since Fatca was rolled out in 2010, as some financial institutions have opted not to service them rather than deal with the onerous requirements.