If you have a spouse at 30th June, or had a spouse during the financial year, you need to report their income on your Income Tax Return.

The ATO advise that your spouse includes another person (of any gender) who you were in a relationship with that was registered under a prescribed state or territory law or, although not legally married to you, lived with you on a genuine domestic basis in a relationship as a couple.

And If you had more than one spouse during the financial year, you should complete the relevant question with the details for your spouse on 30th June, or for your last spouse during the year.

Importantly, if you cannot determine your spouse income, for whatever reason, you must still answer the question by making a reasonable estimate.  The ATO will correct the amount upon lodgement of the Income Tax Return of your spouse.

Regards