A jig for assembling a cabinet is disclosed. The jig includes a clamp assembly pivotally attached to a base. The clamp assembly includes a first jaw and a second jaw configured to apply a clamping force therebetween. The clamp assembly can pivot between a first position and a first inclined position. In the first position, a front support plate of the clamp assembly is oriented vertically, and in the first inclined position, a first angle less than 90 degrees is formed between the front support plate and a support surface on which the base rests. The clamp assembly may also pivot to a second inclined position at which a second angle less than the first angle is formed between the front support plate and the support surface.