CONTROLLING TONER REFILL BY USING TONER REFILL CARTRIDGE

An example image forming apparatus includes a main body, a toner refilling portion, and a controller. On the main body, a development cartridge is mounted. The toner refilling portion is connected to the development cartridge and a toner refill cartridge inserted through a communicating portion of the main body and thus receives, from the toner refill cartridge, authentication information obtained from the toner refill cartridge, thereby adjusting a toner inflow from the toner refill cartridge to the development cartridge. A controller determines whether to allow a toner refill using the toner refill cartridge based on the authentication information obtained from the toner refill cartridge and authentication information obtained from the image forming apparatus and controls the toner refilling portion according to a determination result.