Ok, I'm prepared to be pounced on here...but, is it really unreasonable to wonder if my new partner might be able to reduce payments to his ex slightly since she is now living with someone else full time and they are getting married? It appears that the CSA only look at net pay and take no outgoings into account. They also advised my partner that the maintenance is for his ex and she can spend it how she chooses. Let me make it clear - this does not appear to be on the two children!