The base level of assessable income for individuals providing an Assurance of Support has been increased to A$40,000 from the 1st of July 2006.
This is a significant increase from the previous base figure of A$33,361, and (so far as we know) applies to all visa applicants requiring an Assurance of Support where the AoS has not yet been finalised.
In other words, individuals who are providing an Assurance of Support that has not yet been finalised will be required to demonstrate assessable income for the last two income tax years computed with reference to this higher base figure.
Where an individual cannot meet the new income test it may be necessary to seek another Assurer whose income can be combined with the original Assurer to satisfy the Assurance of Support income requirements – up to 3 people can combine their income to provide a joint AoS.
Source : GoMatilda.com