Reference from: MIA http://www.mia.org.au/
Eligibility for the permanent SIV from 1 July 2015 will require the following residency:
The primary applicant to reside in Australia for 40 days per year OR the secondary applicant (spouse) to reside in Australia for 180 days per year.
There will be no residency requirement for all other secondary applicants.
This residency requirement will be per year and be calculated cumulatively over the four year period of the provisional visa, i.e. 160 days over four years for a primary applicant or 720 days over four years for the secondary applicant (spouse).
Form 80 is no longer a standard requirement when lodging a sub-class 186 and 187 visa application. Case officers may request a Form 80 to be completed to satisfy the delegate regarding information provided.
For more information: firstname.lastname@example.org
Regulation 2.08A allows partners and dependent children to add to some applications for permanent visas.