My husband pays CMS every month but was made redundant about 2 weeks ago to which we notified CMS about the change. He has now found a new job which he starts tomorrow but his gross weekly earnings will not increase by 25%. We received a letter last week to say that he needs to provide a letter and proof to say how he will be supporting himself and us. It states that if he does not notify them he could possibly end up having to pay more etc. My question is - does he have to let them know or will HMRC let them know before the annual review on 3rd December?