Hotels request an "incidental deposit" at check-in as a financial security measure to protect against unpaid charges or property damage incurred during a guest's stay. This "hold" on your credit or debit card ensures the hotel can recover costs for services not included in the room rate, such as minibar consumption, room service, laundry, or paid movie rentals. It also acts as a safeguard against more significant issues, like smoking in a non-smoking room or accidental damage to furniture. By securing this authorization upfront, the hotel avoids the risk of a guest checking out without settling their final tab. The funds are typically released within 3 to 10 business days after departure, provided no extra charges were applied, though the exact timing depends on your bank's processing speed.