The last quarter-century has seen corroles catapulted from relative obscurity to the forefront of chemical and materials sciences and wide-ranging medical and technological applications. Redox-active metallocorroles, thus, are widely used as catalysts, especially as electro-and photo catalysts. Redox-innocent metallocorroles, especially those involving 5d transition elements, hold particular promise for medicine, perhaps most notably as triplet photosensitizers for oxygen sensing and photodynamic and related therapies. The new applications have built directly on an ever-deepening understanding of metallocorroles' electronic structure, at the center of which, arguably, lies the phenomenon of ligand noninnocence. Noninnocent ligands, it may be recalled, do not allow a straightforward determination of the oxidation state of a coordinated metal. A tricky concept, the phenomenon can nonetheless be probed by a battery of physical and quantum chemical methods; very recently, the phenomenon has even been quantified. Presented herein is a first exploration of the potential application of inverse photoemission spectroscopy (IPES) to corrole derivatives.