If corporate tax increases then businesses would make up for the loss of profit due to this raise in taxes by charging consumers a higher price, therefore reducing Aggregate expenditure as fewer people buy the product at the higher price, probably because some would rather buy cheaper imports or because some cannot afford it at all now due to the higher price.
Another thing the business might do to make up for the loss in profit due to the raise in taxes is they might lay off some employees thereby making those fired employees incomes fall to zero, they may also reduce the remaining employees wages or salaries so that business costs fall and a good profit level is reached for the business.