Many hotel guests are surprised by deposits or incidental holds. These are not always extra charges. In many cases, they are temporary authorizations placed on your card to cover possible room damage, smoking fees, unpaid balances, parking, restaurant charges, or other incidentals.
Debit cards can be more complicated because holds may reduce your available bank balance for several days.
Smart guest tip: Use a credit card for hotel deposits when possible. Ask the hotel how much the hold will be and when it is released.