Most useful information for separated parents

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Representative authority form (CS3042)

Use this form to authorise another person or organisation to enquire or act on your behalf about your child support case.

  1. Top payments
  2. Limited child support agreement

What you need to do for a limited child support agreement

The agreement can include payment of cash or non-cash items, such as school fees and health insurance.

  1. Child support assessment
  2. What you need to know

Child support assessment period

A child support period is the amount of time an assessment covers. It can be up to 15 months.

  1. Child support assessment
  2. How to manage your assessment

Changing your child support assessment in special circumstances

We can change your child support in special circumstances if the change is fair to both parents and the child.

  1. Separated parents
  2. Most useful information

Ending a child support assessment form (CS1671)

Use this form if you wish to end a child support assessment made by us.

  1. Raising kids
  2. Separated parents

Help when you’re deciding to separate

Separating can impact your finances, family, and other areas in your life.

  1. Child support assessment
  2. How to manage your assessment

Child support when your child turns 18

Normally child support stops when your child turns 18. If your child's in secondary study, you can apply to extend it to the end of the school year.

  1. Separated parents
  2. Most useful information

Child over 18 in full time secondary education form (CS2716)

Use this form to extend child support to the end of the school year before your child turns 18.

  1. Child support assessment
  2. How we work out your assessment

Basic child support formula

This formula is for parents with only one child support assessment.

  1. Child support assessment
  2. How we work out your assessment

The child support assessment formula

The child support assessment formula looks at your circumstances to work out how much child support should be paid.

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Page last updated: 17 November 2025.
QC 60125