The monarchy generally are paid for by the Crown estates, land which was owned by the Monarch, and which was bound over to the Government in exchange for the Civil list. People play with the figures, buty it is generally believed that the Government are in profit.
Charles has asked to return to a situation where they live off their own estate, whether profitable or not, but the Govt prefers not to, either because they want to keep the surplus, or because they want to keep the Monarch on a leash