The artist, whose real name is Gandhi Djuna, was taken into custody upon arrival at Roissy-Charles de Gaulle airport by French authorities.
According to reports, investigators are probing an alleged network of shell companies used to evade taxes, issue fake invoices, and launder money from illicit activities.
The case is said to involve multiple countries, with several former drug traffickers already linked to the operation.
Authorities are also examining a luxury real estate project connected to the rapper in Marrakech.
Gims, who was the best-selling recording artist in France last year, has not publicly commented on the allegations.
The investigation remains ongoing.
