Five causes for the empty treasury of France under Louis XVI are:
(i) Long years of war had drained the financial resources of France.
(ii) High cost of maintenance of immense palace of Versailles and court.
(iii) Under Louis XVI France helped the thirteen American colonies to gain independence. This further depleted the royal treasury of France.
(iv) Lenders began to barge high interest on loans.
The French treasury was depleted under Louis XVI due to a combination of factors including costly wars, extravagant spending by the royal family, and an inefficient and unfair tax system. Support for the American colonies' fight for independence also added to the financial strain.