What are the delivery modes?
If print, what are the print regions of the likely printers, and do you need to allow for 3-hole punching?
If end users will be printing, their printers are usually more constrained on top & bottom margins.
We have a 0.7 in inside margin for 3-hole, and a 0.6 in outside. In addition to allowing 3-hole, this usually allows A4 printing without rescaling.
We keep all content at least 0.5 in away from top and bottom edge, and material content at least 0.625 in away. This allows for minimum loss when end user duplex print on inkjet printers.