Abstract: A method for facilitating online rental reservations from an online filter-deferred calendar for multi-instanced rental inventory includes the following steps. First, taking inventory of all item instances within a geographic region. Next, assigning a selection order to each item instance within the geographic region. Next, entering availability of each item instance on an individual availability calendar corresponding to each item instance. Next, displaying the individual availability calendar for the item instance with a highest selection order to a user via a user interface. Next, entering a start date and an end date for the item rental by the user via the user interface. Next, checking sequentially each item instance's individual availability calendar and determining a specific item instance that satisfies the entered start date and end date. The checking starts with the item instance having a lowest selection order.