Where this technique is not allowed
Penalised in competition in its classical form, where tori's hand passes between uke's legs: current IJF rules give a shido for the hand reaching the leg. The version that takes uke across the shoulders without touching the legs is thrown in contest today, so what is penalised is the form rather than the technique. The BJA sets kata-guruma as a 4th Dan fundamental skill.
Under contest rules
Depends on the form. Two rules meet here. The classical form, where the hand passes between uke's legs, draws a shido for the hand reaching the leg, while the version taken across the shoulders without touching the legs is thrown in contest and scores. Diving forward onto the head to complete either form is a direct hansoku-make.
Sport and Organisation Rules of the International Judo Federation: refereeing rules, 2026 edition, Articles 18.1.2 and 18.2.1.
Still taught, demonstrated and examined, so it is written up in full here. The restriction above is a contest rule, not a reason to skip it. See the prohibited techniques list.
These steps describe the standard right-handed form without relying on the video.
Left-handed: these steps use the standard right-handed form. Swap every left and right.
Suggest an edit to Step by step for Kata-guruma
Receiving it
You are pulled low across their shoulders as they squat under you, an arm wrapping your thigh; for a moment you are carried, level, off the ground. The dip of their shoulder tells you the throw is coming. You slide off into a fall from height, so stay relaxed, chin tucked, and slap with your free arm as your back lands.
Suggest an edit to Receiving it for Kata-guruma
VI judo notes
The classical form is barred in contest because the hand passes between the legs, and the shoulder version that is legal has to be taken with contact you can trust. Duck by sliding your head down their side, and reach the thigh by running your arm down their body to it rather than into open space. Stand only once their weight sits evenly across both shoulders; if it hangs to one side, put them down.
Suggest an edit to VI judo notes for Kata-guruma