My ex has moved in with a new partner and children. Do I now get less child maintenance?

Many separated couples choose to come to an agreement about maintenance for their children using the Child Maintenance Service (CMS) calculator to form the basis of their payment arrangement. Several factors are used to reach a figure, such as the paying parent’s gross earnings and the amount of overnight care. But what if your ex has moved in with their new partner, who has children? Will the child maintenance they pay be reduced? Read on to find out.