From the rear, the new BMW 6-Series Coupe exudes power, athleticism and solidity. Bulging wheel arches accentuate the wide track of the new car, offering a hint of its impressive roadholding. Added to which, horizontal lines and the broadening impression of the car's shape as you follow it towards the rear paint a clear picture of the sporting performance waiting to be unlocked. The slightly concave lower section of the boot lid generates light and shade effects which lend an extra lightness to the rear of the car. The edges of the boot lid and the licence plate surround create a V-shape, which - similarly to the front of the car - steers the eye towards the road. The exhaust tailpipes are positioned on either side of a diffusor-style apron. On the BMW 650i Coupe they are trapezoidal in shape while on the BMW 640i Coupe they are circular.

The two-part rear light clusters display the customary BMW L-shape in a particularly wide rendition that extends far into the boot lid, while the swage line that flows into the rear lights forges a harmonious link between the side and the rear of the car. Inside the rear light clusters, two LED-powered light strips generate the familiar BMW night-time look, an effect that is reinforced by the L-shaped lower light unit. The direction indicators and brake lights are also LED-powered. The wide additional brake light is located in the upper edge of the boot lid.