The invention relates to a method for routing a chamfered substrate, having applications in the field of electronics, optics, or optoelectronics, which involves depositing a layer of a protective material on a peripheral annular zone of the substrate preferably with the aid of a plasma, partially etching the protective material with the aid of a plasma, so as to preserve a protective ring of the deposited material on the front face of the substrate, this ring located at a distance from the edge of the substrate, so as to delimit an accessible peripheral annular zone, etching a thickness of the material constituting the substrate to be routed, preferably with the aid of a plasma that is level with the accessible peripheral annular zone of the substrate, and removing the ring of protective material preferably with the aid of a plasma.