New details about the changes are on the OSR website:
You are eligible if:
you are buying or building your first home as a natural person, not as a company or trust
you, or a joint applicant, is an Australian citizen or a permanent resident of Australia
you or your spouse (including de facto spouse) have not owned a home in Australia prior to 1 July 2000 (this includes investment homes)
you or your spouse (including de facto spouse) have not resided in a residential property in Australia in which you acquired an interest, on or after 1 July 2000 for a continuous period of at least six months
you occupy the home as your principal place of residence for a continuous period of at least six months commencing within one year of the completion of the transaction to which the application relates
you are at least 18 years of age
you have not already received a grant.
I have owned an investment home previously. Can I still be eligible for the grant? A person is not eligible if they or their spouse (including de facto spouse) has had a relevant interest in any residential property in Australia prior to 1 July 2000, whether they live in it or not.
However, a person may be eligible if they or their spouse (including de facto spouse) has only ever had a relevant interest in any residential property in Australia on or after 1 July 2000 and they have not resided in that property for a continuous period of at least six months.
If I am divorced and my previous partner owned a home in their right, am I eligible for the grant? If you are divorced, you are not required to take into account property in which you did not hold a relevant interest. Provided that you have not had a relevant interest in a previous residential property and all other eligibility criteria have been met, you will be eligible for the grant.
If I previously owned vacant land but not a home, will I be eligible for the grant on the purchase or construction of my first home? Yes. Vacant land is not regarded as residential property for the purposes of First Home Owner Grant.

