14 CFR § 198.15 - Non-premium insurance - payment of registration binders.
(a) The binder for initial registration is $575 for each aircraft or insurable item. This binder is adjusted not more frequently than annually based on changes in the Consumer Price Index of All Urban Consumers published by the Secretary of Labor.
(b) An application for non-premium insurance must be accompanied by the proper binder, payable to the FAA. A binder is not returnable unless the application is rejected.
(d) When an operator acquires an aircraft or insurable item that was previously covered under an active or standby policy, the new operator must register that aircraft or item on its policy and pay the binder for each aircraft and insurable item.