Abstract: An office guillotine, for making tabs on documents or intercalated sheets, includes a knife-blade articulated on a frame and having a curved opposite end to cut strips of a length smaller than that of the sheet thus creating a tab. The length of these strips is determined by the position of the sheet with respect to the knife-blade and correct positioning of the sheet is facilitated by a marking system. The markers include holes disposed on different lines each corresponding to a series of tabs. Pins are inserted successively in the different holes of any one line to achieve the corresponding series of tabs.