The Commonwealth Seniors Health Card is subject to an adjusted taxable income test which is indexed on 20 September each year. There is no assets test.
You should have an annual adjusted taxable income of less than:
$51,500 for singles
$82,400 for couples combined, or
$103,000 for couples combined, couples separated by illness or respite care, or where one partner is in prison
The adjusted taxable income limit is increased by $639.60 for each dependent child you care for.
http://www.humanservices.gov.au/customer/services/centrelink/commonwealth-seniors-health-card