According to the embodiment, an image forming apparatus includes an image forming unit, a writing unit, and a processor. The processor forms a first image again on a third sheet, when the writing unit does not succeed in writing information in a wireless tag of a first sheet, on which the first image is formed by the image forming unit. Further, the processor discharges the third sheet prior to a second sheet, on which a second image is formed, the second image being next to the first image.