An Assurance of Support (AoS) is a legal undertaking by the sponsor, family relative, an organisation, or any other person who may be eligible to be an assurer, to repay certain social security payments to the Australian Government which has been paid to a person or their family members applying to migrate to Australia during their AoS period.
The Assurance of Support is required to remain in place for two years from the date you and any accompanying family members arrive in Australia.
The assurer must:
give sufficient financial support so that you or any accompanying family members do not have to rely on any government support; and
reimburse the Australian Government for any recoverable social security payments, this includes payments made by Centrelink to you and any others covered by the AoS; and
pay a refundable security bond before the visa is approved