Density Functional Theory (DFT) has become the most important paradigm in computational chemistry. Thanks to decades of development, modern DFT methods can accurately compute ground-state energies and properties including non-covalent interactions (NCIs). However, the accuracy of excited-state calculations with time-dependent DFT (TD-DFT) has been less thoroughly interrogated–in particular, for NCIs. As a case study for excited-state NCIs, we have investigated the binding energies of excimers (excited dimers of identical monomers) and exciplexes (excited complexes of distinct monomers). These are defined as being more strongly bound in an electronically excited state compared to their ground state. Excimers and exciplexes are bound by NCIs including electrostatics, charge transfer, London dispersion, and excitonic splitting (excimers only). As such, these systems are challenging to describe theoretically. Our recent work has revealed shortcomings in TD-DFT methods for modelling excimer and exciplex binding [1] including seemingly simple rare-gas dimers.[2] Moreover, current (ground-state) dispersion corrections are insufficient for excited-state NCIs which can vary significantly compared to the ground state. This work also presents preliminary developments towards a state-specific dispersion correction for more accurate TD-DFT.