An image forming apparatus includes: a main casing; a supply cartridge attachable to the main casing; a printing mechanism; a display; and a controller configured to perform: determining, based on information inputted into the controller, whether an agreement is made for the image forming apparatus; setting, when an agreement is made for the image forming apparatus, an operation mode for the image forming apparatus to a pre-contract mode; determining under the pre-contract mode whether a type of the supply cartridge attached to the main casing is a normal type or a subscription type; displaying, when the type of the supply cartridge attached to the main casing is the normal type, information related to the pre-contract mode on the display; and setting, when the type of the supply cartridge attached to the main casing is the subscription type, the operation mode from the pre-contract mode to a formal contract mode.