I recently got the CSA calculations based on my ex's information and it mentions a monthly salary that is quite a bit lower than when we were together. He's a CEO of a multi-million £ internet company and has influence on salary payments and as he's always threatened to do so, the only explanation is that he had his salary reduced. He has, however, shares worth several millions - doesn't he have to mention those to the CSA and won't maintenance payments be impacted?