Bossiaea carinalis is an erect shrub that typically grows to a height of up to and has hairybranchlets. The leaves are arranged alternately, narrow egg-shaped to lance-shaped, mostly long and wide on a petiole long with narrow triangular stipules long at the base. The flowers are borne on a pedicel long with a bract long and similarly sized bracteoles at the base. The sepals are long and joined at the base with the two upper lobes long and the lower lobes long. The standardpetal is red with a yellow base and up to long, the wings yellow or red and slightly longer than the standard, and the keel pink to red and longer than the standard petal. Flowering occurs in most months but mainly from late winter to early spring and the fruit is an oblongpod long.