A keyboard mounting assembly includes a base having a base upper surface and a downwardly-extending base skirt adjacent at least one side of the base upper surface. The base skirt has a recessed portion offset inwardly from the peripheral edge of the base upper surface and formed underneath the base upper surface. The assembly further includes a keyboard tray having a support portion configured to support a keyboard. The support portion has a tray upper surface and a downwardly-extending tray skirt extending along at least a portion of one peripheral edge of the tray upper surface. The tray skirt has a projection extending inwardly from an interior surface of the tray skirt and configured for receipt within the recessed portion of the base skirt when the base is coupled to the keyboard tray. The assembly further includes an interlock mechanism between the base and the keyboard tray.