Your ICAS membership cannot be frozen, paused, suspended or otherwise put on hold, except in cases of serious ill health. We have no reduced fee for members who wish to retain their CA designation but are not using their CA training. If you are a CA you are still regulated by ICAS, no matter what kind of role you are working in, or whether you are working at all.
If you are taking a career break or otherwise will struggle to pay your fees, we do have a range of options to help you. It will normally be easier and cheaper to retain your ICAS membership than to resign and apply for reinstatement later.