What does the determined child support payments cover? I realise they are to help the primary parent pay for all costs associated with the children with them but is there any other unexpected costs that need to be shared out side of these agreed payments? I am thinking of things like school fees, unexpected hospital/doctor fees, costs for excursions, sporting trips etc. Are there any ground rules here or is it to be agreed by both parties as separate costs outside of child support and can be refused if can't afford them or don't agree? Is this covered anywhere in an official document so both parties understand what it includes and does not include before any tricky situations arise.