Auction reservation fees are charges that some auction houses or sellers may require from the winning bidder in addition to the deposit. These fees are typically associated with modern method auctions or online auctions and are paid to reserve the property in the bidder's name. The reservation fee ensures that the seller takes the property off the market and grants the buyer exclusivity for a specified period, usually to arrange financing and complete the purchase. Reservation fees can vary significantly depending on the auction house and the property's sale price, and they may or may not be part of the overall purchase price depending on the auction's terms and conditions. It's important to understand the fee structure of any auction you participate in, as reservation fees can add a substantial amount to the upfront cost of purchasing at auction.