Child support assessment

The assessment period

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

When a new child support period starts

A child support period will start:

  • on the day you make an application for child support
  • on the day you make an application to accept a child support agreement, if it starts a new case
  • on the day a child support agreement changes a child support assessment,
  • the day after the current child period ends, or
  • when the ATO tells us new income information for the most recent financial year, if that year of income isn’t already used in an assessment

If a new ATO income starts a child support period, it starts:

  • on the 1st day of the next month if we receive the ATO income by the 15th of the month, or
  • on the 1st day of the month after next if we receive the ATO income after the 15th of the month

What happens if there are changes during a child support period

We might need to update your assessment. You must tell us as soon as you can if your circumstances change. For example, we need to know if:

  • your income changes, or
  • the amount of time the child lives with you changes

Page last updated: 31 May 2018