For most golfers the ideal top position has the shaft pointing toward or slightly right of the target line. This shows that you cleared your body properly and allowed good weight transfer through the finish.
The arms should naturally separate from your body as the clubhead follows the ball. Your left arm folds towards the body while your right arm straightens more.
Your wrists should be fully hinged at the top of the backswing to allow lag creation during downswing. They should be fully released at impact and then hinge back up at the finish position. Improper hinging, such as cupping, will lead to a bad club and swing path.
Rigid leg and hip rotation can push the shaft out of position. Maintaining pressure in the trail leg supports a strong top position during the backswing, but weight shift to the left side is important, as you have to "clear" your body towards the ball flight. This requires proper lower body mechanics which ends with your left leg straightening, more while the right leg buckles the knee towards the ball flight line and allows the right leg to lift off the ground after impact.
When the shaft points too far to the right of the target line it indicates lack of hand release and an inside to outside swing path which results in pushes. It can result from Reverse Pivoting or taking the club too far inside, normally seen when you try to make Quick Fixes to your swing.
If the shaft points left of the target line, the club has most likely traveled from outside to inside such as can happen when you start with an Upright Spine Angle. It can also indicate that you started with a Steep Spine Angle if you suffered a severe hook shot. Another factor may be that you are flipping and casting the club, which leads to pulls or hooks.
A steep top position forces the club down a steep path which can produce fat shots or slices.
How your wrists hinge can change the angle of the shaft and clubface, leading to many swing errors. Right hand should always fold towards the elbow/outside of the arm, while the left wrist hinges towards the inside of the body without cupping to the outside.
Move slowly to feel where the shaft sits at the top. Adjust until it aligns with your spine and target line.
Use a mirror or live swing feedback tool to confirm your shaft position.
They happen when your spine, hips and shoulders move in perfect harmony.
Turn every swing into a lesson. Try SpineAlign free.