My name is ***** ***** I am a NSW Solicitor. Thank you for your question, and will do my best to assist you with your question. Please understand this is not legal advise Please understand this is not legal advise but a guide to assist you.
Child support is not and order is is an assessment from the CSA.
If you have consent orders for a property split you cannot avoid it because if you do then you are in breach.
If you are unhappy with the amount of Child Support make an application to vary the assessment.
Here is the link that will assist you.
Because one of the children are 18 the support amount should be reduced for the other child only.
I hope this makes sense and is of assistance, if there is nothing further
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